摘要
采用Uddeholm自约束热疲劳试验机研究了新钢种(SDH2)和ASSAB 8407钢的热疲劳性能,结果显示,SDH2钢具有比8407钢更好的热疲劳性能,其热疲劳损伤因子相对8407钢降低30%～60%。并采用扫描电镜探寻热疲劳裂纹萌生与扩展的机制得知,热疲劳裂纹常在硅酸盐类、MnS、氧化铝和富V大块碳化物与基体的交界面上和晶界处萌生,并沿链状碳化物和晶界扩展。
The thermal fatigue behavior of new material SDH2 steel and 8407 steel was investigated by adopting thermal fatigue tester with self-restricted method of Uddeholm. The results indicate that the thermal fatigue property of SDH2 was better than that of 8407 steel, the thermal fatigue damage factor D value of SDH2 steel decreases 30%~60% than the 8407 steel. Study on initiation and expansion of the cracks was attempted with the help of SEM. The results show that the thermal cracks usually initiate at the grain boundary or the interface between matrix and silicate inclusion, MnS, aluminium oxide and some bulk V-rich carbide, and expand mainly along chain carbide and grain boundary interface.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第B08期71-75,共5页
Transactions of Materials and Heat Treatment
基金
上海市重点学科建设项目(T0101)
上海市科委登山项目(065211028)的资助
关键词
热作模具钢
热疲劳性能
碳化物
Hot Working Die Steel
Thermal fatigue property
Carbide
