两种低合金高强度钢的低温疲劳裂纹扩展机制及疲劳机制图  

Fatigue Cracking Mechanism and Fatigue Mechanism Map of Two HSLA Steels at Low Temperature

作　　者：刘建新[1] 涂小慧[1] 胡志忠[1] 鄢文彬[1] 涂铭旌[1] 

机构地区：[1]西安交通大学,710049

出　　处：《机械工程材料》1992年第4期4-7,共4页Materials For Mechanical Engineering

摘　　要：低温下的疲劳裂纹扩展性能变化与疲劳裂纹扩展机制有着密切的联系。通过对两种钢低温疲劳裂纹扩展试验后的断口形貌以及裂纹扩展途径进行了观察和分析,绘制了低温疲劳机制图。通过该图,可以全面了解不同温度下各个阶段的疲劳裂纹扩展机制的变化。本文还对裂纹扩展途径与断口形貌之间的关系进行了分析,对进一步研究低温用钢的疲劳特性和低温下工程结构的失效分析具有重要意义。The variation of fatigue cracking properties at low temperature is related to its mechanism. From observation of fractographies and tracks in this paper, fatigue mechanism maps of two HSLA steels with low temperature were drawn. In this maps, the change of fatigue mechanism with ΔK and decredsing temperature can be found easily. We also analyse the relationship between crack growth track and fractography. Thereforde, it is significant for studying the fatigue property of the steel used and its fatigue analysis at low temperature.

关 键 词：低合金钢 高强度钢 疲劳裂纹扩展 

分 类 号：TG142.33[一般工业技术—材料科学与工程]