【摘要】 利用Gleeble 1500热模拟试验机进行单轴压缩,通过基于马氏体温变形和两相区短时间退火的工艺制备了两种C含量的高锰TRIP钢,并结合扫描电镜、X射线和室温拉伸等实验研究了C含量对高锰TRIP钢制备过程的组织演变和室温力学性能的影响。结果表明,C含量从0.08%提高到0.18%,降低了逆转变奥氏体的化学驱动力,不利于温变形过程中逆转变奥氏体的形成。但由于马氏体分解可得到较多的渗碳体粒子,提高C含量使得退火组织中马奥岛含量和残留奥氏体含量增多且残留奥氏体C含量增加,因此提高了高锰TRIP钢的强度和塑性。更多还原

【Abstract】 Two high manganese TRIP steels with different carbon contents were prepared based on warm deformation of martensite and short-time annealing in the intercritical region,by uniaxial compression tests on a Gleeble 1500 hot simulator. The effects of carbon content on the microstructural evolution and mechanical properties of the high manganese TRIP steels were investigated by means of SEM,XRD and RT tensile tests. The results show that the formation of the reversed austenite during warm deformation is retarded by the increase of carbon content from 0. 08% to 0. 18%,due to the decrease in the chemical driving force of the reversed austenite. However,the fractions of M / A islands and retained austenite( RA) as well as the carbon content of RA in the final microstructure of the high manganese TRIP steels obtained by warm deformation of martensite and short-time annealing in the intercritical region are increased by the increase of carbon content,owing to the higher fraction of cementite particles by the decomposition of martensite. Thus,the strength and ductility of the high manganese TRIP steels is improved by the increase of carbon content.更多还原