| 李辉,米振莉,张华,赵奇.配分时间对Q&P钢力学性能及显微组织的影响[J].材料导报,2017,31(4):83-86, 93 |
| 配分时间对Q&P钢力学性能及显微组织的影响 |
| Influence of Partition Time on Mechanical Properties and Microstructure of Q&P Steel |
| |
| DOI：10.11896/j.issn.1005-023X.2017.04.019 |
| 中文关键词: Q&P工艺 微观组织 残留奥氏体 配分时间 |
| 英文关键词: Q&P process, microstructure, retained austenite, partition time |
| 基金项目:国家自然科学基金(51101048);国家863项目(2012AA03A508) |
|
| 摘要点击次数: 1919 |
| 全文下载次数: 562 |
| 中文摘要: |
| 设计了一种中碳中锰Q&P(Quenching and partitioning)钢,基于热力学平衡理论计算分析了其相变过程,通过扫描电镜(SEM)、背散射电子衍射(EBSD)和透射电镜(TEM)研究了实验钢经不同热处理后的微观组织,测试了其力学性能,并采用X射线衍射仪(XRD)进一步分析了拉伸断裂前后残留奥氏体含量的演变规律。结果表明:室温下实验钢微观组织为板条状马氏体和弥散分布的残留奥氏体；残留奥氏体主要存在于马氏体板条之间和原始奥氏体晶界处；随配分时间延长,抗拉强度逐渐降低,延伸率呈现升高趋势；试样拉断后,断口处残留奥氏体含量在3.5%~4.5%之间,明显低于拉伸前的含量(6.94%~10.78%),说明大部分残留奥氏体在拉伸过程中发生了TRIP效应,提高了实验钢的塑性。 |
| 英文摘要: |
| Based on the regulating and controlling theory of thermodynamic, the microstructure evolution and mechanical properties of a new designed medium-carbon-manganese steel after Q&P process was studied by SEM,EBSD and TEM. The mecha-nical properties was tested,and the evolution mechanism of retained austenite was discussed by XRD. The results indicated that the microstructure was consisted of lath martensite and dispersively distributed retained austenite; the retained austenite was emerged in the form of thin film between martensite laths and blocks along the grain boundaries; the strength decreased and the elongation increased with the increase of partition time; the fraction of retained austenite decreased from 6.94%-10.78% to 3.5%-4.5% after tensile test, which indicated the occurrence of TRIP effect and the increase of ductility. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
