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研究了不同RE含量对TRIP/TWIP钢组织和性能的影响,利用拉伸试验机测试其力学性能和OM及TEM观察其微观结构变化。结果表明,变形前组织以奥氏体为主,亚结构为退火孪晶和高密度的平面位错,变形后有大量形变孪晶亚结构出现,且有α马氏体组织产生,证实发生了TRIP效应和TWIP效应,变形后孪晶衍射花样观察发现在两个斑点之间有暗线,表明有层错存在。发现随着RE含量的增加,形变孪晶变短而且数量变少,证实RE有抑制TWIP效应的作用,TWIP效应减弱导致n值明显减小,且RE细化了晶粒,导致了强度和屈强比提高。
The effects of different RE contents on the microstructure and properties of TRIP / TWIP steel were investigated. The mechanical properties of the TRIP / TWIP steel were tested by tensile testing machine and the microstructural changes of the TRIP / TWIP steel were observed by OM and TEM. The results show that the pre-deformation tissue is mainly austenite, the sub-structure is annealed twin and high-density plane dislocation. A large number of deformed twins substructures appear after deformation, and α-martensite is produced, which confirms the occurrence TRIP effect and TWIP effect, deformation twins diffraction pattern observation found that there is a dark line between the two spots, indicating the presence of faults. It was found that with the increase of RE content, the deformation twins became shorter and the number decreased, confirming that RE had the effect of inhibiting the TWIP effect. The weakened TWIP effect resulted in a significant decrease of n value and RE refinement of the grains, resulting in the increase of strength and flexion Strong ratio increased.