袁永立,何国球,樊康乐,佘萌,卢棋,刘晓山,朱旻昊

• 1:同济大学材料科学与工程学院上海金属功能材料开发与应用重点实验室
• 2:西南交通大学牵引动力国家重点实验室

摘要(Abstract)：

研究了取样于汽车发动机缸体上的HT250灰铸铁的常温低周疲劳行为。对循环应力-应变和应变-疲劳寿命数据进行了分析,给出了该材料在常温下的疲劳参数。循环应力响应行为表明,HT250灰铸铁在较小应变幅下经历初期循环硬化、循环软化、断裂;而较大应变幅下几乎无硬化阶段,循环软化至断裂,原因在于循环形变过程中位错之间以及位错与石墨、夹杂物之间的相互作用。疲劳断口分析表明:疲劳裂纹萌生于片状石墨尖端,夹杂物及局部软点,且沿石墨扩展;疲劳断裂的方式是准解理脆断和沿晶断裂的复合机制,断口有解理面和二次裂纹,并存在韧性断裂特征;断口附近的气孔、夹杂等铸造缺陷较多,部分石墨片互相连接成网状,导致局部区域强度降低,促进失效。

关键词(KeyWords)： HT250灰铸铁;低周疲劳;循环应力响应;疲劳裂纹

Abstract:

Keywords:

基金项目(Foundation): 牵引动力国家重点实验室开放课题(TPL1306)

作者(Author): 袁永立,何国球,樊康乐,佘萌,卢棋,刘晓山,朱旻昊

DOI: 10.13289/j.issn.1009-6264.2014.05.029

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