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·%.

中文翻译：

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不同等温时间对双稳C-Mn分配工艺处理低碳钢组织和力学性能的影响

双稳C-Mn分配过程提高了残余奥氏体的稳定性。采用EPMA、SEM、OM、拉伸试验机等分析方法研究了受试钢双稳C-Mn分配过程的相变和元素扩散。分别研究了第一次和第二次奥氏体稳定时间对低C-Si-Mn钢组织和力学性能的影响。经双稳C-Mn分配过程后，C、Mn元素富集明显，受试钢显微组织由马氏体、铁素体和残余奥氏体组成。与常规Q&P钢相比，经双稳C-Mn分配工艺处理的钢的抗拉强度略低，但塑性显着提高。