摘要
用正电子寿命方法研究３Ｃｒ２Ｗ８Ｖ模具钢的热疲劳。通过对不同循环次数的热疲劳样品的正电子寿命谱和表面显微硬度的测量，发现表面显微硬度ＨＶ和平均正电子寿命τ随疲劳循环次数Ｎ的变化呈现出类周期振荡特征。讨论了正电子寿命变化所反映出的材料中的缺陷变化，进而初步分析了热疲劳的微观机制。
The thermal fatigue in 3Cr2W8V die steel is studied by positron lifetime and hardnessmeasurement.It has been found that the microhardness HV and the mean positron lifetimeexhibit quasi-periodical oscillation when the number of the fatigue cycles is increased.Exper-iments indicate that the oscillation may result from the variation of defects such as the vacan-cies,dislocations and voids in the steel during thermal fatigue.
出处
《华中理工大学学报》
CSCD
北大核心
1994年第1X期139-143,共5页
Journal of Huazhong University of Science and Technology
关键词
模具钢
热疲劳
缺陷
正电子探测
die steel
thermal fatigue
defects
positron lifetime.
