摘要
采用Uddeholm自约束热疲劳试验方法，运用扫描电镜、X射线衍射分析技术及X射线应力测试仪等，研究了H13钢渗硼层在3000周次的热疲劳试验后，渗层形貌和相组成的变化，以及0-3000周次的热循环过程中，表面残余应力的变化，并与未渗硼试样进行对比。分析了渗硼层热疲劳裂纹形成的原因。结果表明，渗硼层所具有的高强度和好的热稳定性，改变了热疲劳裂纹的萌生及扩展的方式和热疲劳裂纹的形貌，提高了H13钢的热疲劳抗力。
With the Uddeholm serf-restricted thermal fatigue method, the transformation of phase composition and morphology of boriding layer after 3000 cycles of thermal fatigue test was studied by XRD and SEM, and the surface residual stress in the process of thermal fatigue test was investigated by X-ray stress analyzer. The reason of forming thermal fatigue cracking of boriding layer was also analyzed. The results show that the high strength and excellent thermal stability of boriding layer changed the way of nucleation and propagation and morphology of thermal fatigue crocking, and hence improved the thermal fatigue resistance of H13 steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2007年第12期67-70,共4页
Heat Treatment of Metals
基金
中瑞合作项目和上海科技发展基金(991007003)
关键词
H13钢
渗硼处理
热疲劳性能
H13 steel
boriding treatment
thermal fatigue behavior
