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| 用正电子探测热疲劳模具钢中的缺陷变化 | |
| 引用本文： | 唐超群,李国元,施占华,李熙章. 用正电子探测热疲劳模具钢中的缺陷变化[J]. 华中科技大学学报(自然科学版), 1994, 0(Z1) |
| 作者姓名： | 唐超群 李国元 施占华 李熙章 |
| 作者单位： | 华中理工大学物理系 |
| 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。 |
| 关 键 词： | 模具钢；热疲劳；缺陷；正电子寿命 |
Variation of Defects in Thermally Fatigued Steel Probed by Positrons |
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| Tang ChaoqunDept.Physics,H. U. S.T.,Wuhan ,China).,Li Guoyuan,Shi Zhanhua,Li Xizhang. Variation of Defects in Thermally Fatigued Steel Probed by Positrons[J]. JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE, 1994, 0(Z1) | |
| Authors: | Tang ChaoqunDept.Physics H. U. S.T. Wuhan China). Li Guoyuan Shi Zhanhua Li Xizhang |
| Affiliation: | Tang ChaoqunDept.Physics,H. U. S.T.,Wuhan 430074,China).,Li Guoyuan,Shi Zhanhua,Li Xizhang |
| Abstract: | 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. |
| Keywords: | die steel thermal fatigue defects positron lifetime. |
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