张敏;慕二龙;许桓瑞;程康康;罗海龙;

• 1:西安理工大学材料科学与工程学院

摘要(Abstract)：

为揭示显微组织对低碳马氏体高强韧不锈钢疲劳损伤的影响规律,选取两种不同的工艺对0Cr13Ni5Mo钢(退火态)进行热处理:工艺1,淬火(1 050℃保温1 h,油冷)+回火(650℃保温2 h,空冷);工艺2,淬火(1 050℃保温1 h,油冷)+回火(700℃保温2 h,空冷)。用光学显微镜(OM)和电子显微镜(SEM)对不同热处理工艺下试板的显微组织、疲劳断口进行分析,通过拉伸、冲击和高周疲劳试验测试试板的力学性能。结果表明:两种热处理工艺下试板的组织均为板条状回火马氏体+逆变奥氏体+颗粒状碳化物,工艺2的显微组织中逆变奥氏体的量大大减少;试板经两种热处理后冲击功均大幅提升,工艺1试板的冲击功最大,为86 J,抗拉强度、屈服强度、高周疲劳极限均最高,分别为956.11、746.19、480 MPa;试样的S-N曲线在107周次左右时会出现平台,且当疲劳寿命小于107周次时,S-N曲线呈连续下降趋势,疲劳寿命随载荷的降低而增加;高周疲劳断口可以分为裂纹源区、裂纹扩展区和瞬断区。

关键词(KeyWords)： 0Cr13Ni5Mo钢;热处理工艺;显微组织;高周疲劳

Abstract:

Keywords:

基金项目(Foundation): 国家863计划(2013AA031303);; 国家自然科学基金(51274162);; 陕西省教育厅专项科研计划项目(14JK1539);; 陕西省协同创新计划项目(2015XT-39)

作者(Author): 张敏;慕二龙;许桓瑞;程康康;罗海龙;

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参考文献(References)：

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