回火温度对40Cr钢疲劳裂纹萌生寿命的影响

RELATIONSHIP BETWEEN TEMPERING TEMPERATURE AND CRACK INITIATION LIFE FOR 40Cr STEEL

  • 摘要: 用系统分析的方法,通过三点弯曲疲劳试验,以数值描述的方式,在线跟踪了40Cr钢及其在三种回火温度下疲劳裂纹萌生过程的疲劳损伤,实验结果表明:随着回火处理温度的提高,40Cr钢的疲劳裂纹萌生寿命都有不同程度的提高. 但裂纹萌生寿命在低于450^\circC的温度范围里,随着回火温度的提高,裂纹萌生寿命有明显的提高,在450^\circC至580^\circC范围内,随回火温度的上升,裂纹萌生寿命则没有明显的增加.

     

    Abstract: The relationship between tempering temperature andcrack initiation life for 40Cr steel is investigated by system analysismethod in this paper. The samples at three tempering temperatures are examined in three-point bending fatigue tests. The results showthat there are two stages of crack initiations varing with tempertemperatures: (1) from 20^\circC\sim450^\circC, the crackinitiation life increases remarkably; (2) from 450^\circC\sim580^\circC, the crackinitiation life increases insignificantly. The results also show that thesystem analysis method is effective in the measurement of crack initiation lifenumerically.

     

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