采用扫描电镜原位观测法，跟踪观察了航空用超高强度钢中长方型夹杂物导致裂纹萌生与扩展的微观行为。结果表明，拉伸载荷作用下，航空用超高强度钢中裂纹萌生的方式与夹杂物尺寸及夹杂物周围孔洞的大小有关。当夹杂物面积小于一定值时，无论夹杂物周围有无孔洞，裂纹均以夹杂物/基体界面开裂的方式萌生；当夹杂物面积大于一定值后，若夹杂物/基体界面基本完好，则裂纹易以夹杂物自身开裂的方式萌生；若夹杂物周围孔洞面积较大，则裂纹易以夹杂物/基体界面开裂的方式萌生。
Insitu tensile tests with special designed SEM have been conducted to trace the whole process of crack initiation and propagation induced by inclusion in ultrahigh strength steel. The experimental results show that the types of crack initiation at inclusion in ultrahigh strength steel under tensile load depend on the sizes of inclusion and the hole around inclusion. When the area of an inclusion is smaller than a certain critical value, the inclusion has almost no influence on tensile property of ultrahigh strength steel, but when the area of an inclusion is larger than the critical value, the inclusion is harmful to the tensile property ultrahigh strength steel.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%