【摘要】 对不含Nb和含Nb的两种高锰TRIP/TWIP钢进行了固溶处理,通过室温拉伸实验研究了两种实验钢的力学性能.利用光学显微镜、透射电子显微镜和X射线衍射观察实验钢变形前后的微观组织,并分析了含Nb实验钢中Nb析出物的形态和分布.实验结果表明:随着固溶温度的升高,两种成分的实验钢抗拉强度均下降.固溶温度为900℃时,含Nb实验钢组织仍有少量的热轧带状组织;固溶温度为1 000℃时,与此时的不含Nb实验钢相比,含Nb钢基体内的晶粒细小;在拉伸实验中,两种实验钢均表现出TRIP/TWIP的特性,不含Nb实验钢的TRIP形变强化机制更为突出.更多还原

【Abstract】 High manganese steels with and without Nb were solution-treated at different temperatures.Their mechanical properties were investigated through tensile tests and their microstructures were characterized by means of optical microscope,X-ray diffraction and transmission electron microscope,as well as the morphologies and distribution of the Nb precipitates.The tensile strength of the two experimental steels decreased with increasing the solution temperature.After solution treatment at 900 ℃ for 1hr,unlike the steel without Nb,there was still a small quantity of banded structures formed in hot-rolling of the steel with Nb.When the steels were solution-treated at 1 000 ℃,the grains in the steel with Nb were finer than those without.During the tensile tests,the deformation mechanisms of the two experimental steels are attributable to the TRIP and TWIP effects,and the TRIP effect becomes dominant for the steel without Nb.更多还原