• CN:11-2187/TH
  • ISSN:0577-6686

›› 2001, Vol. 37 ›› Issue (11): 28-31.

• 论文 • 上一篇    下一篇

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脉冲放电截止热疲劳裂纹的亚临界扩展

高展殿;李慧;付宇明;白象忠   

  1. 燕山大学机械工程学院
  • 发布日期:2001-11-15

ACTED A PULSE CURRENT TO PREVENT THE THERMAL FATIGUE CRACK SUBCRITICAL EXTENDING

Gao Diankui;Li Hui;Fu Yuming;Bai Xiangzhong   

  1. Yanshan University
  • Published:2001-11-15

摘要: 对3Cr2W8V模具热疲劳裂纹进行脉冲放电,裂纹尖端熔化形成焊点,使裂尖钝化,阻止了热疲劳裂纹的亚临界扩展。脉冲放电能使裂尖处的组织和性能发生有利的变化,显著地提高裂尖处裂纹萌生所需的能量和扩展功,截止了亚临界裂纹的继续扩展。

关键词: 板条马氏体, 裂尖钝化, 脉冲电流, 热疲劳裂纹

Abstract: The thermal extrusion punch of 3Cr2W8V is acted a pulse current. So small welded joins are formed by metal melting, the crack tip is passivation and the thermal fatigue crack is prevented from subcritical extending. The pulse current discharge can make the structure and capability of the crack tips progress, improving the energy and expansion work required when the crack burgeon in the crack tip. The thermal fatigue crack subcritical extending could be prevented.

Key words: Batten martensite, Crack tip passivation, Pulse current, Thermal fatigue crack

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