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OALib Journal期刊
ISSN: 2333-9721
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应变速率对奥氏体不锈钢cr17mn6ni4cu2n铸坯热塑性的影响*
Keywords: 金属材料,奥氏体不锈钢,高温拉伸试验,应变速率,热塑性
Abstract:
？研究了应变速率对奥氏体不锈钢cr17mn6ni4cu2n铸坯热塑性的影响。结果表明,壳层的微观组织为δ铁素体树枝晶分布在奥氏体晶粒内部,提高应变速率会降低其热塑性,并使裂纹形核位置由δ铁素体树枝晶处变为奥氏体晶界处;在芯部铁素体分布在奥氏体晶粒内部及晶界上,提高应变速率会提高其热塑性,且裂纹的形核位置由晶界铁素体处变为晶界铁素体和奥氏体晶界处。在高应变速率下变形,铁素体和奥氏体的强度均提高,并使它们之间的强度差别减小,导致裂纹形核位置由铁素体向奥氏体晶界转移。在壳层,较高的应变速率提高了奥氏体晶界处的应力集中,导致其塑性降低;在芯部,较高的应变速率降低了铁素体处的应力集中,使其热塑性提高。
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