• CN:11-2187/TH
  • ISSN:0577-6686

›› 1988, Vol. 24 ›› Issue (3): 59-64.

• 论文 • 上一篇    下一篇

温度和蠕变损伤对HK40钢蠕变裂纹扩展的影响

朱世杰;李培恩;于永泗;张俊善;曹智本   

  1. 大连工学院
  • 发布日期:1988-06-01

THE EFFECTS OF TEMPERATURE AND CREEP DAMAGE ON CREEP CRACK GROWTH IN HK40 STEEL

Zhu Shijie;Li Peien;Yu Yongsi;Zhang Junshan;Cao Zhiben   

  1. Dalian Institute of Technology
  • Published:1988-06-01

摘要: 通过在1103~1163°K下测量HK40钢时辰变裂纹扩展速率,分析了温度对蠕变裂纹扩展速率的影响,求出的裂纹扩展激活能接近蠕变激活能,这表明裂纹扩展由蠕变的某种机制控制。在1144°K下,研究了铸态(NL),运行21000小时(YB2)和运行50000小时(DB1)三种材料的蠕变裂纹扩展行为。指出,铸态材料和蠕变损伤的材料的蠕变损伤的材料的蠕变裂纹扩展行为是不同的,DB 1蠕变空洞数量多是其裂纹扩展速率高于YB2的主要原因,细小二次碳化物使裂纹扩展速率增高。

关键词: HK40钢, 蠕变裂纹扩展, 蠕变损伤

Abstract: Creep crack growth behavior has been investigated in CT-specimen of as-cast HK40 steel at temperatures of 1103, 1123, 1144 and 1163K. Apparent activation energies for creep and creep crack growth have been measured in the temperature range of 1103 to 1163K and over limited ranges of stress and temperature similar values are calculated. This means that a creep mechanism may control the crack growth rate. The creep crack growth behavior of cast and two creep damaged specimens is different. The crack growth rate of cast specimen increases more quickly than that of creep damaged specimen with the increase of the stress intensity factor. It is the main reason of the higher crack growth rate of DB1 that the area fraction of cavities for DB1 is larger than that for YB2. The fine secondary carbide makes the crack growth rate quicken.

Key words: HK40钢, 蠕变裂纹扩展, 蠕变损伤