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航空学报 > 1988, Vol. 9 Issue (9): 466-474

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K_(Imax)

金石, 朱保华   

  1. 西北工业大学
  • 收稿日期:1987-12-03 修回日期:1900-01-01 出版日期:1988-09-25 发布日期:1988-09-25

CORROSION FATIGUE AND FAILURE MECHANISM OF 30CrMnSiNi2A STEEL WITHIN K_(Imax)

Jin Shi, Zhu Baohua   

  1. Northwestern Polytechnical University
  • Received:1987-12-03 Revised:1900-01-01 Online:1988-09-25 Published:1988-09-25

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摘要： 应用电化学-断裂力学方法研究了30CrMnSiNi2A钢在室温模拟潮湿大气（H2O）及海洋大气（3.5％NaCl）环境中低K范围内不同电位下的疲劳裂纹扩展特性。通过动力学及断口分析,提出在KImaxIscc范围内高强度钢可发生循环应力腐蚀开裂,其湿腐蚀疲劳失效机理应是裂尖局部阳极溶解与氢脆共同作用,且两者对△Kth及da/dN的意义不同,从而对以往高强度钢湿腐蚀疲劳的纯氢脆模型作出修正。

Abstract: Corrosion fatigue crack propagation behaviors of ultranigh strength steel 30CrMnSiNi2A （b=1726.6MPa） within KImax707mV, SCE）, Kth is increased from 7.0 to 7.6MPa m . however, da/dN is also increased. SEM fractographic examination shows that a mixed type of intergranular and transgranular （mainly quasicleavage） failures with secondary cracks on the fracture surface is typical for all specimens tested in corrosion environments, while pure transgranular failure, is the characteristics of the micro-frac-tography of the. specimens tested in air. The proportion of intergranular failure on fracture surfaces for specimens tested in disilled water is only one half of that for specimens tested in 3.5%NaCl solution and increased with electrochemical potential applied. According to the crack propagation data and the results of fractographic examination, the mechanism of the wet corrosion fatigue failure of 30CrMnSiNi2A steel in the range of KImax

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