谢少雄,李久楷,侯方,刘永杰,王清远,张军辉

• 1:四川大学空天科学与工程学院
• 2:四川大学建筑与环境学院
• 3:上海电气电站设备有限公司上海汽轮机厂

摘要(Abstract)：

利用旋转弯曲疲劳试验机,研究了CrMoW转子钢在常温与600℃条件下的超高周疲劳特性。对试验数据采用了三参数模型拟合,利用扫描电子显微镜(SEM)对疲劳断口进行分析。研究结果发现,600℃下的S-N曲线呈现连续下降的趋势,不存在传统意义上的疲劳极限。高温会加速试样的氧化,促进裂纹的萌生与扩展,降低材料的疲劳寿命。疲劳加载后材料的微观结构没有发生明显的变化,微观组织中有少量淬火加热时未溶解的残余MX相。断口分析表明,疲劳裂纹主要萌生于试样表面。在600℃下,裂纹萌生区发现夹杂物,该处裂纹的萌生是表面裂纹起源和亚表面夹杂物相藕合的结果。

关键词(KeyWords)： CrMoW转子钢;高温超高周疲劳;疲劳强度;夹杂物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11327801;11172188;11302142;11502151)

作者(Author): 谢少雄,李久楷,侯方,刘永杰,王清远,张军辉

DOI: 10.13289/j.issn.1009-6264.2016.02.014

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