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材料导报  2019, Vol. 33 Issue (z1): 386-391    
  金属与金属基复合材料 |
碳含量对Cr-Mo-V系模具钢连续冷却转变规律的影响
邱凌1,2, 吴红庆1,2, 张乐1,2, 吴晓春2
1 上海大学材料科学与工程学院,上海 200444
2 省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200444
Effect of Carbon Content on the Continuous Cooling Transformation Characteristics of Cr-Mo-V Die Steel
QIU Ling1,2, WU Hongqing1,2, ZHANG Le1,2, WU Xiaochun2
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444
2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444
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摘要 使用热膨胀仪测定碳元素质量分数分别为0.36%、0.46%和0.74%的三种Cr-Mo-V系模具钢的连续冷却转变曲线,并结合光学显微镜(OM)、扫描电镜(SEM)及显微硬度仪分析碳元素对相变点、连续转变规律、组织以及硬度的影响。结果表明:随着碳含量的增加,三种钢的Ac1点差别不大,Accm点和Ms点则明显降低,0.46C和0.74C钢的Accm点分别比0.36C钢降低了24 ℃和62 ℃,Ms点分别降低了39 ℃和109 ℃。在1 030 ℃下,三种钢均发生珠光体、贝氏体、马氏体相变。随着碳含量的提高,未溶碳化物含量增加,珠光体相区和贝氏体相区左移,完全马氏体的相变临界冷速增大,显微硬度也增大。
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关键词:  模具钢  碳元素  相变点  连续冷却转变  相变规律    
Abstract: The continuous cooling transformation (CCT) diagrams of Cr-Mo-V die steels with different carbon contents (0.36%, 0.46% and 0.74%) were measured by dilatometry. The effects of carbon on the CCT diagrams, microstructure and hardness of Cr-Mo-V die steels were studied by optical microscopy (OM), scanning electron microscopy (SEM) and Vickers hardness test. The results show that the Cr-Mo-V die steels with different carbon contents have almost the same Ac1 temperature, Accm and Ms temperatures are decreased obviously. The Accm temperatures of 0.46C and 0.74C steels are decreased by 24 ℃ and 62 ℃, and the Ms temperatures are decreased by 39 ℃ and 109 ℃ compared to 0.36C steel, respectively. Three die steels appear pearlitic transformation, bainite transformation and martensitic transformation when austenited at 1 030 ℃. With the increasing of carbon content, the undissolved carbide content increases, the phase regions of pearlite and bainite in CCT curves shift to the left, the critical cooling rates of the complete martensite increase and the microhardness increases.
Key words:  die steels    carbon    phase transformations points    continuous cooling transformation    phase transformation law
               出版日期:  2019-05-25      发布日期:  2019-07-05
ZTFLH:  TG151.2  
基金资助: 国家重点研发计划资助项目(2016YFB0300400;2016YFB0300404)
作者简介:  邱凌,上海大学研究生,2016年9月至2019年6月,在上海大学获得材料加工工程专业工学学士学位。以第一作者在国内外学术期刊上发表论文2篇,研究工作主要围绕先进模具材料开发及其表面处理。吴晓春,上海大学教授,博士研究生导师。近年来完成模具相关科研项目110余项(科研经费达8300多万元),发表论文350余篇,获发明专利授权20项,获省部级科技进步二等奖3项。是我国“十一五”国家科技支撑计划课题“高品质模具钢锻材关键技术开发”、 “十三五”国家重点研发计划项目“高性能工模具钢及应用”项目的首席专家。wuxiaochun@shu.edu.c
引用本文:    
邱凌, 吴红庆, 张乐, 吴晓春. 碳含量对Cr-Mo-V系模具钢连续冷却转变规律的影响[J]. 材料导报, 2019, 33(z1): 386-391.
QIU Ling, WU Hongqing, ZHANG Le, WU Xiaochun. Effect of Carbon Content on the Continuous Cooling Transformation Characteristics of Cr-Mo-V Die Steel. Materials Reports, 2019, 33(z1): 386-391.
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