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对具有不同层错能的材料:Q235钢、纯铜和H62黄铜分别进行模压形变试验,并对其模压形变后的显微组织和力学性能进行研究。结果表明:模压形变可以有效地细化材料的晶粒尺寸;金属材料的层错能越低,晶粒细化效果越好;随着模压道次的增加材料的显微硬度升高;层错能低的H62黄铜,随形变道次增大硬度增加幅度更高。中高层错能的纯铜和Q235钢主要以位错机制细化晶粒,低层错能的H62黄铜主要以位错机制和孪生方式共同作用使晶粒细化。
Materials with different stacking faults: Q235 steel, pure copper and H62 brass were respectively subjected to the mold deformation test, and the microstructure and mechanical properties after the mold deformation were studied. The results show that the die deformation can effectively refine the grain size of the material. The lower the stacking fault energy is, the better the grain refinement effect. The higher the microhardness of the material is, H62 brass can be low, with deformation increases the degree of hardness increase higher. The high-level faults of pure copper and Q235 steel refine the grains mainly by the dislocation mechanism, and the lower-level faults of H62 brass mainly make the grain refinement by the combination of the dislocation mechanism and twinning.