【摘要】 通过热模拟压缩和两相区退火实验,结合SEM、XRD方法,研究基于马氏体温变形的高锰TRIP钢制备过程的组织演变,并分析了变形工艺和退火工艺对组织演变的影响。结果表明:高锰TRIP钢温变形促进马氏体分解及铁素体动态再结晶的发生,两相区变形过程中可以形成奥氏体,同时渗碳体粒子溶解。随后两相区退火时,铁素体通过再结晶完成等轴化,奥氏体持续形成的同时渗碳体粒子逐渐溶解。通过高锰TRIP钢马氏体温变形加两相区退火工艺,可以在较小应变量和较短退火时间条件下获得由亚微米尺度的铁素体基体、马氏体和残留奥氏体组成的复相组织。更多还原

【Abstract】 Microstructural evolution of high manganese TRIP steel based on warm deformation of martensite was investigated by uniaxial hot compression tests on a Gleeble 1500 simulation test machine and annealing in a muffle furnace,by means of SEM and XRD,the influences of deformation parameters and annealing parameters on microstructural evolution were also discussed. The results show that warm deformation accelerates the decomposition of martensite and dynamic recrystallization of ferrite. During warm deformation in the intercritical region,austenite can be formed dynamically with the dissolution of cementite particles. During subsequent intercritical annealing,static recrystallization of ferrite results the formation of equiaxed grains,austenite is formed gradually with the continuous dissolution of cementite particles. By warm deformation of martensite and then intercritical annealing,multi-phase microstructures can be obtained at smaller strain and shorter annealing time,which consists of submicron-grained ferrite,martensite and retained austenite.更多还原