摘要
本文系统的阐述了近30年来粉末冶金高速钢的疲劳裂纹的萌生与扩展行为的研究进展。粉末高速钢晶粒细化、碳化物分布均匀,弥散度高,碳化物细化效果使得抗弯强度、冲击韧性大幅度提高。但是粉末高速钢由于微结构之间的平均距离比熔铸高速钢要小的多,其裂纹扩展速率较高,使得粉末高速钢过早断裂的危险性比熔铸高速钢要大。而减少粉末高速钢夹杂物的临界尺寸和降低孔隙率可以有效的改善其疲劳性能。
This paper systematically elaborate the research progress of fatigue crack initiation and propagation for powder metallurgy high speed steels in the past 30 years. Powder metallurgy high speed steels has fine grain, homogeneous distributed carbide, high dispersity, which drastically improve its bending strength and impact toughness. However, because of the mean distance between microstructure much smaller than fused cast high speed steels, powder metallurgy high speed steels have high rate of crack propagation, which makes it has higher risk of early fracture than fused cast high speed steels. Moreover, the decrease of critical size and porosity for inclusions in powder metallurgy high speed steels is an effective means to improve its fatigue property.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2016年第4期300-309,共10页
Powder Metallurgy Technology
基金
硬质合金国家重点实验室项目资助(201403001)资助
关键词
粉末高速钢
疲劳裂纹
萌生与扩展
powder metallurgy high speed steels
fatigue crack
initiation
propagation
