ABSTRACT

The Q&P process of hot-rolled medium manganese steel (0.11C, 4.95Mn, 1.6Si,0.34Crwt-%) was studied and annealing at 660°C was selected to investigate the mechanism of microstructure evolution of medium manganese steel at different partitioning temperatures, and SEM, EBSD, XRD and transmission electron microscopy were used to analyse and observe the medium manganese steel. The results show that the partitioning temperature affects the distribution of martensite and austenite, with the parallel distribution of martensite being thicker and longer, making the austenite distributed between them more stable; the retained austenite at the boundary of the short rod-like martensite is subjected to larger deformation forces and is less stable. The best overall performance of the test steel was achieved when the partitioning temperature was 230°C, with a total elongation after breaking of 27.4%, and the product of tensile strength and elongation was 34.8 GPa-%.

摘要

研究了热轧中锰钢（0.11C、4.95Mn、1.6Si、0.34Crwt-%）的Q&P工艺，并选择660℃退火，研究不同分配温度下中锰钢显微组织演变机制。 ，并采用SEM、EBSD、XRD和透射电镜对中锰钢进行分析观察。结果表明，分配温度影响马氏体和奥氏体的分布，马氏体的平行分布更粗、更长，使得奥氏体分布在它们之间更加稳定；短棒状马氏体边界处的残余奥氏体承受较大的变形力，稳定性较差。当配分温度为230℃时，试验钢的综合性能最佳，