通过高温拉伸试验研究了应变速率对Cr15Mn9Cu2NiN和Cr17Mn6Ni4Cu2N两种铸态奥氏体不锈钢热塑性的影响。结果表明: Cr15Mn9Cu2NiN钢的显微组织为单一奥氏体, 而Cr17Mn6Ni4Cu2N钢中有残留δ铁素体分布在奥氏体晶界和晶粒内部; 将应变速率由0.1 s-1升高至10 s-1后, 变形时奥氏体晶界处增加的应力集中的作用与减少晶界滑移的作用相抵消, 因此对Cr15Mn9Cu2NiN钢的热塑性无明显影响; 但Cr17Mn6Ni4Cu2N钢的显微组织中存在较多的奥氏体/铁素体相界, 这些相界在高应变速率时会变成位错源迅速产生大量的位错, 从而提高奥氏体和铁素体强度, 降低铁素体处的应力集中作用, 使其断面收缩率提高10%以上。

所属栏目

试验研究国家自然科学基金资助项目(51264026)

收稿日期

2012/12/52013/11/25

作者单位

侯国清:兰州理工大学 甘肃省有色金属新材料省部共建国家重点试验室, 兰州 730050
朱亮:兰州理工大学 甘肃省有色金属新材料省部共建国家重点试验室, 兰州 730050
田彦龙:兰州理工大学 甘肃省有色金属新材料省部共建国家重点试验室, 兰州 730050
边红霞:兰州理工大学 甘肃省有色金属新材料省部共建国家重点试验室, 兰州 730050

备注

侯国清(1982-), 男, 河北沧州人, 博士研究生。

引用该论文:

HOU Guo-qing,ZHU Liang,TIAN Yan-long,BIAN Hong-xia.Effect of Strain Rate on Hot Ductility of Cast Low Ni Austenitic Stainless Steel[J].Materials for mechancial engineering,2014,38(2):19～23
侯国清,朱亮,田彦龙,边红霞.应变速率对铸态低镍奥氏体不锈钢热塑性的影响[J].机械工程材料,2014,38(2):19～23

被引情况:

【1】

肖强, "2Cr18Ni8W2不锈钢圆棒精锻过程的有限元模拟",机械工程材料 40, 71-74(2016)
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