异步轧制TWIP钢的力学性能和微观组织

 利用金相显微镜、X射线衍射仪和透射电子显微镜对异步轧制及热处理TWIP钢的力学性能与微观组织进行了研究。结果表明，TWIP钢经500℃异步轧制后强度显著提高，而塑性降低，这是位错与孪晶共同作用的结果。轧制后的热处理降低了位错密度以及变形孪晶数量，导致强度降低，伸长率升高。经600℃和700℃退火后，TWIP钢表现出良好的强度和塑性综合性能。因此，异步轧制后热处理是获得具有优良综合力学性能TWIP钢的可行途径。

Mechanical Properties and Microstructures of the TWIP Steels Subjected to Asymmetric Rolling

The mechanical properties and microstructures of the TWIP steels subjected to asymmetric rolling (ASR) and post-annealing processes were investigated by means of optical microscope, X ray diffractometer and transmission electron microscope. The results indicate that the strength of the TWIP steel is greatly increased while the ductility is decreased obviously after asymmetrically rolled at 500℃. Such results are ascribed to the combined action of dislocations and twins. The heat treatment after rolling reduces the dislocation density and amount of twins, and consequently leads to the decrease of strength and increase of elongation. After annealing at 600℃ and 700℃, the TWIP steel have good property combination of both strength and ductility. Therefore, the ASR plus post-annealing process was a feasible approach to achieve excellent combinative mechanical properties in TWIP steels.