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不同等温时间对双稳态C-Mn分区处理低碳钢组织和力学性能的影响

Effect of Different Isothermal Time on Microstructure and Mechanical Property of the Low-Carbon Steel Treated by Dual-Stable C-Mn Partitioning Process.

作者信息

Jing Cainian, Ding Xiaoyun, Ye Daomin, Zhao Jingrui, Lin Tao, Xu Shubo

机构信息

School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China.

出版信息

Scanning. 2020 Mar 7;2020:5931721. doi: 10.1155/2020/5931721. eCollection 2020.

DOI:10.1155/2020/5931721
PMID:32211090
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7081034/
Abstract

The stability of retained austenite was improved by the dual-stable C-Mn partitioning process. The phase transformation and element diffusion of dual-stable C-Mn partitioning process of tested steel were investigated by means of EPMA, SEM, OM, tensile testing machine, and other analysis methods. The effects of the first and second austenite stabilization time on the microstructure and mechanical properties of low-C-Si-Mn steel were studied, respectively. The enrichment of C and Mn elements is obvious after the dual-stable C-Mn partitioning process, and the microstructure of the tested steel is constituted of martensite, ferrite, and retained austenite. Compared with the conventional Q&P steel, the tensile strength of the steel treated by the dual-stable C-Mn partitioning process is slightly lower, but the plasticity is improved significantly. The tensile strength is 875-910 MPa, the elongation is 20-24%, and the product of strength and elongation can reach 21 GPa·%.

摘要

双稳态C-Mn分配工艺提高了残余奥氏体的稳定性。借助电子探针微区分析（EPMA）、扫描电子显微镜（SEM）、光学显微镜（OM）、拉伸试验机等分析方法，研究了试验钢双稳态C-Mn分配工艺的相变和元素扩散。分别研究了第一次和第二次奥氏体稳定化时间对低碳-硅-锰钢组织和力学性能的影响。双稳态C-Mn分配工艺后，C和Mn元素的富集明显，试验钢的组织由马氏体、铁素体和残余奥氏体组成。与传统的淬火-配分（Q&P）钢相比，经双稳态C-Mn分配工艺处理的钢的抗拉强度略低，但塑性显著提高。抗拉强度为875-910MPa，伸长率为20-24%，强度与伸长率的乘积可达21GPa·%。

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