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通过奥氏体化预处理、两相区临界退火以及贝氏体等温处理这3个过程制备了含退火马氏体组织的TRIP钢(TAM钢),利用拉伸试验机、扫描电镜、透射电镜以及X射线衍射对其力学性能和微观组织进行了表征,在此基础上研究了奥氏体化预处理温度对力学性能及微观组织的影响规律。结果表明,含退火马氏体组织的TRIP钢,具有良好的断后伸长率和强塑积,尤其是在奥氏体化预处理温度为950℃时,其断后伸长率高达40%以上,强塑积高达27 GPa·%;其微观组织由铁素体、贝氏体、残留奥氏体以及退火马氏体构成,退火马氏体精细结构呈现板条状,板条间存在残留奥氏体;奥氏体化预处理温度对残留奥氏体体积分数没有显著影响,但对最终组织中的退火马氏体体积分数以及晶粒大小有显著影响。
TRIP steel (TAM steel) with annealed martensite was prepared through austenitizing pretreatment, two-phase zone critical annealing and bainite isothermal treatment. Tensile test machine, scanning electron microscopy, transmission electron microscopy X-ray diffraction and mechanical properties and microstructure were characterized. Based on the results, the influence of austenitizing pretreatment temperature on mechanical properties and microstructure was studied. The results show that the TRIP steels with annealed martensite have good elongation at break and high ductility, especially at the austenitizing pretreatment temperature of 950 ℃, the elongation after fracture reaches as high as 40% The strong plastic product is as high as 27 GPa ·%. The microstructure consists of ferrite, bainite, retained austenite and annealed martensite. The fine structure of annealed martensite is lath-like and the residual austenite The austenitizing pretreatment temperature had no significant effect on the retained austenite volume fraction but had a significant effect on the volume fraction of annealed martensite and the grain size in the final microstructure.