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本文对工业用5CrMnMo钢超塑性变形特性进行了研究。测定了不同晶粒尺寸的lgσ—lgε关系曲线。研究了温度,应变速率与延伸率之间的关系。在晶粒尺寸为8.53μm的试样上、在700℃下、以4.9×10~(-4)s~(-1)的应变速率拉伸时,获得了最大延伸率、其值为582％。对变形后试样的组织分析结果表明:5CrMnMo钢在超塑性变形时有扩散蠕变、晶界滑移和位错滑移三种变形机制同时发生。晶界滑移为主要变形机制。
In this paper, the superplastic deformation characteristics of industrial 5CrMnMo steel were studied. The lgσ-lgε curves of different grain sizes were determined. The relationship between temperature, strain rate and elongation was studied. When the sample with a grain size of 8.53μm was stretched at a strain rate of 4.9 × 10 ~ (-4) s ~ (-1) at 700 ℃, the maximum elongation was obtained, which was 582% . The results of microstructure analysis of deformed specimens show that creep deformation, grain boundary slip and dislocation slip occur simultaneously in 5CrMnMo steel during superplastic deformation. Grain boundary slip as the main deformation mechanism.