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Effect of Prior Cold Deformation on the Stability of Retained Austenite in GCr15 Bearing Steel
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作者 Feng Wang Dong-Sheng Qian Xiao-Hui Lu 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第1期107-115,共9页
In this work, the effect of prior cold deformation on the stability of retained austenite in GCr15 bearing steel was investigated after quenching and tempering treatment. The thermal stability was evaluated by calcula... In this work, the effect of prior cold deformation on the stability of retained austenite in GCr15 bearing steel was investigated after quenching and tempering treatment. The thermal stability was evaluated by calculating thermal activation energy for decomposition of retained austenite using differential scanning calorimeter. The mechanical stability was investigated according to the strain-induced martensitic transformation behavior of retained austenite under the standard compression testing. It is found that the prior cold deformation not only accelerates the carbide dissolution during the austenitization process but also contributes to the carbon partitioning in the tempering stage due to the higher density of phase boundaries, which results in the improvement of the thermal stability of retained austenite. Due to the enhanced carbide dissolution, the higher carbon content in the prior austenite will intensify the isotropic strain of martensitic transformation. As a consequence, the film-like retained austenite is likely to form under a higher hydrostatic pressure and thus shows a higher mechanical stability. Additionally, it is noteworthy that the benefits of the prior cold deformation to the stability of retained austenite would be saturated when the cold deformation degree is larger than 40%. 展开更多
关键词 GCR15 BEARING steel Prior cold deformation RETAINED AUSTENITE stability
EH40钢中第二相粒子对奥氏体尺寸的影响
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作者 武绍文 张彩军 +1 位作者 郑非凡 薛瑞 《金属热处理》 CAS CSCD 北大核心 2019年第7期88-92,共5页
分析了EH40级船板钢在不同奥氏体化温度(900~1300℃)和奥氏体化时间(0~150 min)下,第二相粒子对奥氏体尺寸的影响。结果表明:在相同奥氏体化温度下,随着奥氏体化时间的增加,奥氏体尺寸增加缓慢;在相同奥氏体化时间下,随着奥氏体化温度... 分析了EH40级船板钢在不同奥氏体化温度(900~1300℃)和奥氏体化时间(0~150 min)下,第二相粒子对奥氏体尺寸的影响。结果表明:在相同奥氏体化温度下,随着奥氏体化时间的增加,奥氏体尺寸增加缓慢;在相同奥氏体化时间下,随着奥氏体化温度的提高,奥氏体尺寸增加迅速;当奥氏体化温度介于1050~1100℃等温0.5~150 min,奥氏体尺寸增加最快,由于达到了Nb C的全固溶温度(1058℃),Nb C对奥氏体的钉扎作用消失,所以奥氏体尺寸呈指数关系上升(150~300μm)。 展开更多
关键词 奥氏体 第二相粒子 苦味酸 全固溶温度
JMatPro在4Cr5Mo2V钢热处理工艺设计中的应用 预览
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作者 夏云峰 张光川 +1 位作者 赵卫国 刘艳春 《新技术新工艺》 2019年第4期14-18,共5页
4Cr5Mo2V是国内近几年研发的一款新型高性能、高寿命热作模具钢,其较目前使用最为广泛的H13钢具备更加优良的热强性和耐冷热疲劳性能,可满足大型的压铸模、热锻和热挤压等热作模具的使用要求。然而,热处理工艺是决定模具钢综合性能和使... 4Cr5Mo2V是国内近几年研发的一款新型高性能、高寿命热作模具钢,其较目前使用最为广泛的H13钢具备更加优良的热强性和耐冷热疲劳性能,可满足大型的压铸模、热锻和热挤压等热作模具的使用要求。然而,热处理工艺是决定模具钢综合性能和使用寿命的关键环节,要想充分挖掘该材料的性能潜力,确定合理的热处理工艺参数显得尤为重要。JMatPro是一套功能强大的金属材料相图计算与材料性能预测软件,经广泛的经验验证确保了该软件模拟计算的准确性,而强大的数据计算能力和简洁的操作界面又确保了其模拟计算的高效性和便捷性,通过借助JMatPro模拟软件对4Cr5Mo2V新型高品质模具钢在不同温度下的相组成进行研究和分析,可快速确定其最佳的热处理工艺参数范围,减少试验次数,提高工艺设计效率。 展开更多
关键词 临界点 碳化物 奥氏体 马氏体 淬火 回火
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Effect of retained austenite and nonmetallic inclusions on the thermal/electrical properties and resistance spot welding nuggets of Si-containing TRIP steels 预览
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作者 V.H.Vargas I.Mejía +1 位作者 V.H.Baltazar-Hernández C.Maldonado 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第1期52-63,共12页
Five advanced high-strength transformation-induced plasticity(TRIP)steels with different chemical compositions were studied to correlate the retained austenite and nonmetallic inclusion content with their physical pro... Five advanced high-strength transformation-induced plasticity(TRIP)steels with different chemical compositions were studied to correlate the retained austenite and nonmetallic inclusion content with their physical properties and the characteristics of the resistance spot welding nuggets.Electrical and thermal properties and equilibrium phases of TRIP steels were predicted using the JMatPro software.Retained austenite and nonmetallic inclusions were quantified by X-ray diffraction and saturation magnetization techniques.The nonmetallic inclusions were characterized by scanning electron microscopy.The results show that the contents of Si,C,Al,and Mn in TRIP steels increase both the retained austenite and the nonmetallic inclusion contents.We found that nonmetallic inclusions affect the thermal and electrical properties of the TRIP steels and that the differences between these properties tend to result in different cooling rates during the welding process.The results are discussed in terms of the electrical and thermal properties determined from the chemical composition and their impact on the resistance spot welding nuggets. 展开更多
关键词 transformation-induced plasticity steel retained austenite non-metallic inclusions magnetic saturation electrical PROPERTIES THERMAL PROPERTIES resistance spot welding NUGGET
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Prediction model for austenite grains growth during reheating process in Ti micro-alloyed cast steel by coupling precipitates dissolution and coarsening behavior
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作者 Tao Liu Mu-jun Long +4 位作者 Wen-jie He Deng-fu Chen Zhi-hua Dong Xian-guang Zhang Hua-mei Duan 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第2期162-172,共11页
A combined model to predict austenite grains growth of titanium micro-alloyed as-cast steel during reheating process was established.The model invoIves the behaviors of austenite grains growth in continuous heating pr... A combined model to predict austenite grains growth of titanium micro-alloyed as-cast steel during reheating process was established.The model invoIves the behaviors of austenite grains growth in continuous heating process and isothermal soaking process,and the variation of boundary pinning efficiency caused by the dissolution and coarsening kinetics of sec on d-phase particles was also con sidered into the model.Furthermore,the experimental verificatio ns were performed to examine the prediction power of the model.The results revealed that the mean austenite grains size increased with the increase in reheating temperature and soaking time,and the coarsening temperature of austenite grains growth was 1423 K under the current titanium content.In addition,the reliability of the predicted results in continuous heating process was validated by continuous heating experimenls.Moreover,an optimal regression expression of austenite grains growth in isothermal soaking process was obtained based on the experimental results.The compared results indicated that the combined model in conjunction with precipitates dissolution and coarsening kinetics had good reliability and accuracy to predict the austenite grains growth of titanium micro-alloyed casting steel during reheating process. 展开更多
关键词 Austenite grains GROWTH REHEATING process PRECIPITATE DISSOLUTION PRECIPITATE COARSENING Prediction model
Microstructural Characteristics and Mechanical Properties of Low-Alloy, Medium-Carbon Steels After Multiple Tempering
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作者 Erfan Abbasi Quanshun Luo Dave Owens 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第1期74-88,共15页
The microstructure and mechanical properties of NiCrMoV-and NiCrSi-alloyed medium-carbon steels were investigated after multiple tempering. After austenitising, the steels were hardened by oil quenching and subsequent... The microstructure and mechanical properties of NiCrMoV-and NiCrSi-alloyed medium-carbon steels were investigated after multiple tempering. After austenitising, the steels were hardened by oil quenching and subsequently double or triple tempered at temperatures from 250 to 500 °C. The samples were characterised using scanning electron microscopy and X-ray diffraction, while the mechanical properties were evaluated by Vickers hardness testing, V-notched Charpy impact testing and tensile testing. The results showed that the retained austenite was stable up to 400 °C and the applied multiple tempering below this temperature did not lead to a complete decomposition of retained austenite in both steels. It was also found that the microstructure, hardness and impact toughness varied mainly as a function of tempering temperature,regardless of the number of tempering stages. Moreover, the impact toughness of NiCrMoV steel was rather similar after single/triple tempering at different temperatures, while NiCrSi steel exhibited tempered martensite embrittlement after single/double tempering at 400 °C. The observed difference was mainly attributed to the effect of precipitation behaviour due to the effect of alloying additions in the studied steels. 展开更多
关键词 MEDIUM-CARBON steels MULTIPLE TEMPERING Alloying addition MECHANICAL properties RETAINED AUSTENITE Precipitation behaviour
316L不锈钢在温变形条件下的应变诱导马氏体行为
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作者 张鹏程 《金属热处理》 CAS CSCD 北大核心 2019年第2期44-49,共6页
利用光学显微镜、扫描电镜在不同尺度对样品进行组织观察,通过X射线衍射进行马氏体含量分析,通过SEM、TEM结合组织观察分析试样的变形机制,研究了温变形对316L奥氏体不锈钢应变诱导马氏体含量和显微组织的影响。结果表明,316L不锈钢经... 利用光学显微镜、扫描电镜在不同尺度对样品进行组织观察,通过X射线衍射进行马氏体含量分析,通过SEM、TEM结合组织观察分析试样的变形机制,研究了温变形对316L奥氏体不锈钢应变诱导马氏体含量和显微组织的影响。结果表明,316L不锈钢经温轧变形后,既有板条状马氏体,也有位错型马氏体。200℃下80%的变形量,会导致58. 23%的应变诱导马氏体生成。当变形量为80%时,400℃的变形温度相比于室温变形,其马氏体含量从约64%降低到了约19%。 展开更多
关键词 316L不锈钢 温变形 应变诱导马氏体 奥氏体
Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels
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作者 Jun-hui Li Hong-hong Wang +3 位作者 Qiang Luo Li Li Chao Sun R.D.K. Misra 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第7期761-770,共10页
The microstructure in welding heat-affected zones of 5 wt.% manganese steels was studied, and its effect on impact toughness was analyzed. The simulated coarse-grained heat-affected zone (CGHAZ) had the lowest impact ... The microstructure in welding heat-affected zones of 5 wt.% manganese steels was studied, and its effect on impact toughness was analyzed. The simulated coarse-grained heat-affected zone (CGHAZ) had the lowest impact toughness of ~39 J at — 40℃ because of coarse-grained structure and least volume fraction of retained austenite (RA) of 1.2 vol.%. The impact toughness of simulated intercritical heat-affected zone (ICHAZ) and fine-grained heat-affected zone (FGHAZ) were ~165 and ~45 J, respectively, at — 40℃. The effective grain size of simulated FGHAZ was smaller than that of the simulated ICHAZ. Furthermore, microstructural investigation revealed that the simulated FGHAZ and ICHAZ had similarity in volume fraction and stability of RA. However, tempered martensite was present in ICHAZ and absent in FGHAZ. It is proposed that the presence of tempered martensite contributed to good impact toughness in simulated ICHAZ. 展开更多
关键词 5 wt.% manganese steel Welding heat-affected zone RETAINED AUSTENITE Tempered MARTENSITE Impact TOUGHNESS
薄壁奥氏体不锈钢管对接接头超声相控阵检测 预览
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作者 周路云 顾军 +2 位作者 王国圈 刘书宏 符明海 《化工设备与管道》 CAS 2019年第3期72-77,共6页
奥氏体不锈钢对接接头广泛用于压力管道制造过程中,焊接接头的质量直接影响到承压特种设备的安全。目前,NB/T 47013-2015明确规定常规脉冲反射法超声检测只适用于10~80 mm的奥氏体不锈钢管对接接头。大量4~10 mm薄壁奥氏体不锈钢压力管... 奥氏体不锈钢对接接头广泛用于压力管道制造过程中,焊接接头的质量直接影响到承压特种设备的安全。目前,NB/T 47013-2015明确规定常规脉冲反射法超声检测只适用于10~80 mm的奥氏体不锈钢管对接接头。大量4~10 mm薄壁奥氏体不锈钢压力管道对接接头只能采用射线检测。运用相控阵超声检测技术对4~10 mm壁厚工件进行可行性研究,通过实验验证了相控阵检测技术的可行性和有效性。 展开更多
关键词 薄壁 奥氏体 相控阵
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热处理原理中概念的更新 预览
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作者 刘宗昌 计云萍 《热处理技术与装备》 2019年第3期1-5,共5页
更新金属热处理原理中的基本概念具有重要的理论意义和应用价值。本文仅就奥氏体、珠光体、贝氏体、马氏体、回火索氏体以及珠光体转变、贝氏体相变、马氏体相变等重要概念进行了分析和更新,力求发展热处理理论和技术。
关键词 奥氏体 珠光体 贝氏体 马氏体 回火索氏体
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Effect of Cu content on microstructures and mechanical properties of ADI treated by two step austempering process
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作者 Peng-yue Yi Er-jun Guo +2 位作者 Li-ping Wang Yi-cheng Feng Chang-liang Wang 《中国铸造:英文版》 SCIE 2019年第3期168-176,共9页
The effect of Cu content on the microstructures and mechanical properties (yield strength, ultimate tensile strength, impact energy, fracture toughness) of austempering ductile iron (ADI) treated by two-step austemper... The effect of Cu content on the microstructures and mechanical properties (yield strength, ultimate tensile strength, impact energy, fracture toughness) of austempering ductile iron (ADI) treated by two-step austempering process were investigated. High Cu content in nodular cast irons leads to a significant volume fraction of retained austenite in the iron after austempering treatment, but the carbon content of austenite decreases with the increasing of Cu content. Moreover, austenitic stability reaches its maximum when the Cu content is 1.4% and then drops rapidly with further increase of Cu. The ultimate tensile strength and yield strength of the ADI firstly increases and then decreases with increasing the Cu content. The elongation keeps constant at 6.5% as the Cu content increases from 0.2% to 1.4%, and then increases rapidly to 10.0% with further increase Cu content to 2.0%. Impact toughness is enhanced with Cu increasing at first, and reaches a maximum 122.9 J at 1.4% Cu, then decreases with the further increase of Cu. The fracture toughness of ADI shows a constant increase with the increase of Cu content. The influencing mechanism of Cu on austempered ductile iron (ADI) can be classified into two aspects. On the one hand, Cu dissolves into the matrix and functions as solid solution strengthening. On the other hand, Cu reduces solubility of C in austenite and contributes more stable retained austenite. 展开更多
关键词 Cu-alloyed ADI TWO-STEP AUSTEMPERING process mechanical properties AUSTENITE stability
Effect of simulated thermomechanical processing on transformation behavior and microstructure of 82B steel
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作者 He Wei Yin-li Chen +1 位作者 Lan Su Di Tang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第1期69-77,共9页
The effects of loop-laying temperature and austenite deformation on the phase(ransformation behavior during continuous cooling,microstructure,and pearlite interlaminar spaci ng in 82B steels were investigated.Static a... The effects of loop-laying temperature and austenite deformation on the phase(ransformation behavior during continuous cooling,microstructure,and pearlite interlaminar spaci ng in 82B steels were investigated.Static and dynamic conti nu ous cooling transformation(CCT)diagrams were measured with a Gleeble-3500 thermal simulator,and the mechanisms governing changes in the initial temperature,initial time,and duration of the phase transformation zone were also analyzed and discussed.The results show that CCT diagram shifted to the bottom right,the initial temperature of the phase transition decreased,the initial time of the phase transition increased,the duration of the phase transition increased,and the lamellar spacing of pearlite was finer as the loop-layi ng temperature in creased.The initial phase transition time decreased,and the phase transition duration first reduced,then increased,and finally decreased in the static condition and in the dynamic condition at 850℃as the cooling rate increased.Meanwhile,the phase transition duration continuously decreased in the dynamic condition at 900℃.At a given loop-laying temperature,the lamellar spacing in pearlite was finer due to austenite deformation compared with the undeformed case.Compared with the results shown in the dynamic CCT diagram,the corresponding phase diagrams of the static CCT diagram slightly shifted to the bottom right.Moreover,there was a clear lin ear relationship between the reciprocal of the lamellar spaci ng in pearlite and the average undercooling degree in the phase transformation zone. 展开更多
关键词 82B STEEL Phase TRANSFORMATION Loop-laying temperature AUSTENITE deformation MICROSTRUCTURE
Effect of tempering temperature on the microstructure and properties of ultrahigh-strength stainless steel
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作者 Yangpeng Zhang Dongping Zhan +1 位作者 Xiwei Qi Zhouhua Jiang 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第7期1240-1249,共10页
The microstructure, precipitation and mechanical properties of Ferrium S53 steel, a secondary hardening ultrahigh-strength stainless steel with 10% Cr developed by QuesTek Innovations LLC, upon tem pering were studied... The microstructure, precipitation and mechanical properties of Ferrium S53 steel, a secondary hardening ultrahigh-strength stainless steel with 10% Cr developed by QuesTek Innovations LLC, upon tem pering were studied by scanning electron microscopy (SEM), transm ission electron microscopy (TEM), X-ray diffraction (XRD), and tensile and impact tests. Based on these results, the influence of the tem pering temperature on the microstructure and properties was discussed. The results show th at decom position occurred when the retained austenite was tem pered above 440 ℃ and that the hardening peak at 482 ℃ was caused by the joint strengthening of the precipitates and martensite transformation. Due to the high Cr content, the trigonal M7C3 carbide precipitated w hen the steel was tem pered at 400 ℃, and M7C3 and M2C (5 -10 nm in size) coexisted w hen it was tem pered at 482 ℃. When the steel was tem pered at 630 ℃, M2C and M23C6 carbides precipitated, and the sizes w ere greater than 50 nm and 500 nm, respectively, but no M7C3 carbide formed. When the tempering tem perature was above 540 ℃, austenitization and large-size precipitates w ere the main factors affecting the strength and toughness. 展开更多
关键词 Age HARDENING AUSTENITE PRECIPITATION TEMPERING Strengthening mechanism M7C3
奥氏体晶粒度显示方法的试验探索 预览
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作者 冯紫萱 《山西冶金》 CAS 2019年第2期50-51,61共3页
晶粒度是金属材料的重要显微组织参量,本文简要介绍了三种显示奥氏体晶粒度的方法,主要介绍了汉钢计量检验中心实验室采用氧化法试验的过程。
关键词 奥氏体 晶粒度 显示 氧化法
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T22锅炉钢奥氏体晶粒长大和马氏体转变行为的原位观察 预览
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作者 季慧玲 张义伟 《热处理》 CAS 2019年第1期1-5,41共6页
采用高温激光共聚焦显微镜(LSCM)对SA213-T22锅炉钢的奥氏体晶粒长大和马氏体转变的动态特性进行了原位观察研究。结果表明:①在950~ 1200 ℃,T22钢的奥氏体平均晶粒尺寸(D)与加热温度(T)之间的定量关系可近似地用Arrhenius方程描述,奥... 采用高温激光共聚焦显微镜(LSCM)对SA213-T22锅炉钢的奥氏体晶粒长大和马氏体转变的动态特性进行了原位观察研究。结果表明:①在950~ 1200 ℃,T22钢的奥氏体平均晶粒尺寸(D)与加热温度(T)之间的定量关系可近似地用Arrhenius方程描述,奥氏体晶界迁移的激活能(Q)约为 140.5 kJ/mol;②奥氏体晶粒通过晶界的迁移和扩张、多个小晶粒合并成一个大晶粒以及分割和呑并邻近晶粒而长大;③马氏体在奥氏体的晶界和晶内形核并迅速长大,计算得出的马氏体板条束的长大速度约为282.7 μm/s。 展开更多
关键词 锅炉钢 高温共聚焦显微镜 奥氏体 晶粒长大 马氏体转变
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Texture development and properties of Ti-IF steels produced by different hot-rolling processes
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作者 Lei-lei Hao Lang Li +3 位作者 Chen-yang Qiu Jian-gong Wang Xun Zhou Yong-lin Kang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第3期310-320,共11页
Texture is a pivotal factor for the deep drawability of interstitial free steel (IF steel). The evolution of microstructure and recrystallization texture of Ti-IF steel through the processing of hot rolling, cold roll... Texture is a pivotal factor for the deep drawability of interstitial free steel (IF steel). The evolution of microstructure and recrystallization texture of Ti-IF steel through the processing of hot rolling, cold rolling and annealing have been studied. The mechanical properties including strain hardening index n and plastic strain ratio r are also measured. For comparison, ferrite rolling and austenite rolling are both studied. The results show that the intensity of γ-fiber after ferrite rolling is higher than that after austenite rolling. The great balance between the {111}〈110〉 and {111}〈112〉 leads to low △r value after annealing. The size of precipitates in ferrite rolled sample is generally larger than that in austenite rolled sample. Compared to austenite rolled sample, the ferrite rolled and annealed one has better formability and its r value reaches 2.36. Different from laboratory production, the test steels were acquired from industrial trial, and all the result can be used in industrial production directly. 展开更多
关键词 TI-IF steel FERRITE ROLLING AUSTENITE ROLLING Microstructure TEXTURE
钢中奥氏体晶粒长大规律 预览
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作者 刘文月 任毅 +2 位作者 王爽 张帅 高红 《上海金属》 CAS 北大核心 2019年第4期88-93,共6页
评述了奥氏体正常长大过程中影响晶粒尺寸的因素、晶粒尺寸计算常用公式与晶粒尺寸确定方法等,归纳了钢中奥氏体长大的定性与定量规律。目前计算奥氏体晶粒尺寸的公式多为经验公式,尚不具备预测的功能。
关键词 奥氏体 晶粒长大 ZENER-HOLLOMON参数 Zener方程
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不同热处理状态下GCr15钢的晶粒度显示方法 预览
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作者 俞亚杰 史景松 《理化检验:物理分册》 CAS 2019年第8期530-532,共3页
在实际生产中,采用传统的浸蚀方法无法直接检验出交货状态材料的实际晶粒度。为此通过试验得到了不同热处理状态GCr15钢晶粒度显示所需的最佳浸蚀条件,证明了可以通过优化的浸蚀方法显示出原奥氏体晶界,从而确定退火、热轧状态GCr15钢... 在实际生产中,采用传统的浸蚀方法无法直接检验出交货状态材料的实际晶粒度。为此通过试验得到了不同热处理状态GCr15钢晶粒度显示所需的最佳浸蚀条件,证明了可以通过优化的浸蚀方法显示出原奥氏体晶界,从而确定退火、热轧状态GCr15钢的实际晶粒度。 展开更多
关键词 GCR15钢 奥氏体 晶粒度 浸蚀
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马氏体组织形貌形成机理 预览
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作者 刘宗昌 计云萍 《热处理技术与装备》 2019年第4期1-7,共7页
研究马氏体组织形貌形成机理具有重要的理论意义和工程价值。马氏体的形貌复杂,有板条状、片状、蝶状、薄片状、针状、“透镜”片状、隐晶状等;以往以切变机制衍生的各类学说解释马氏体组织形貌的成因,均不正确。实验研究表明,奥氏体→... 研究马氏体组织形貌形成机理具有重要的理论意义和工程价值。马氏体的形貌复杂,有板条状、片状、蝶状、薄片状、针状、“透镜”片状、隐晶状等;以往以切变机制衍生的各类学说解释马氏体组织形貌的成因,均不正确。实验研究表明,奥氏体→马氏体相变时的体积应变能是影响马氏体组织形貌的主要原因。马氏体的形核-长大是按照能量消耗最小的途径进行的,沿着应变能最小的晶向、晶面长大,形成不同的马氏体组织形貌。隐晶马氏体也是条片状,其形成与奥氏体晶粒内的成分不均匀性有关。 展开更多
关键词 奥氏体 淬火 马氏体形貌 应变能 固态相变
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4Cr5Mo2V热作模具钢TTT曲线测定及球化退火工艺探索
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作者 姚杰 吴红庆 +3 位作者 王春涛 左鹏鹏 陈王海 吴晓春 《模具工业》 2019年第7期51-55,59共6页
采用热膨胀法测定4Cr5Mo2V热作模具钢奥氏体化后在不同等温温度下的相变膨胀曲线,结合组织观察和相转变后材料硬度的测定,绘制了4Cr5Mo2V钢奥氏体等温转变曲线(TTT曲线),并对曲线进行了分析和讨论,为制订合理的球化退火工艺建立了依据... 采用热膨胀法测定4Cr5Mo2V热作模具钢奥氏体化后在不同等温温度下的相变膨胀曲线,结合组织观察和相转变后材料硬度的测定,绘制了4Cr5Mo2V钢奥氏体等温转变曲线(TTT曲线),并对曲线进行了分析和讨论,为制订合理的球化退火工艺建立了依据。结果表明,4Cr5Mo2V钢的相变临界点Ac1为835℃、Accm为938℃、Ms为321℃,其最佳固溶温度为1 060~1 080℃,最佳保温时间为1 h,最佳球化退火工艺为870℃×2 h+750℃×8 h。 展开更多
关键词 热膨胀法 4Cr5Mo2V TTT曲线 球化退火工艺 奥氏体
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