摘要
采用加氩渗氮和无氩渗氮两种离子渗氮方法 ,对用作铝合金压铸模材料的H13钢的热疲劳性能进行了比较。结果发现 ,无氩渗氮的化合物层对H13钢的热疲劳性能具有双重影响 ,一方面能推迟热疲劳裂纹的萌生 ,阻止热裂纹向基体内部扩展 ,另一方面表面裂纹直、宽、多 ,易于剥落并扩展快 ,因此 。
With the Uddeholm self restricted method, the effect of plasma nitriding on thermal fatigue behavior of H13 steel aluminum die casting dies is studied by these ways of conventional plasma nitriding and adding Ar during plasma nitriding. The result shows that the compound layer of plasma nitriding can delay the nucleation of heat crack and hold back and the propagation of heat crack from surface to substrate to some extent because of its high hardness and strength. On the other hand, the heat checking expands faster with compound layer on the surface than that without it. After 3 000 cycles of thermal fatigue tests heat crack with the compound layer is wider than the later one the number of heat crack of the former is more and from the view of cross section. The negative effects of the conventional plasma nitriding will restrict its application.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2002年第3期14-16,共3页
Surface Technology
基金
中瑞国际合作基金
上海市科技发展合作基金 (9910 0 70 0 3 )
上海市教委资助项目
关键词
H13钢
离子渗氮
化合物层
热疲劳特性
铝合金压铸模
H13 steel
Plasma nitriding
Compound layer
Thermal fatigue behavior
Aluminum die casting dies
