The change in hydrogen thermal desorption characteristic of low-alloy steel due to fatigue was investigated to examine the possibility of hydrogen as a tracer for detecting and evaluating lattice defects caused by cyclic loading. Specimens were subjected to the uniaxial fully push–pull fatigue test at 288°C, and some tests were interrupted at various stages of the fatigue life. After measurement of surface crack, hydrogen-charging into the fatigue-damaged specimens was conducted by means of cathodic electrolysis, and thermal desorption analysis (TDA) was applied to those specimens for measuring hydrogen evolution curve. The experimental results showed that the amount of desorbed hydrogen, C_H, increased with increasing number of cycles, especially at an early stage of fatigue life. The C_H was well correlated with a newly proposed Coffin–Manson-type parameter Δε_p·N^0.4, irrespective of the strain range and number of cycles.

中文翻译：

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基于氢热解吸特性变化的低合金钢疲劳损伤评估

研究了疲劳引起的低合金钢氢热解吸特性的变化，以检验氢作为示踪剂检测和评估循环载荷引起的晶格缺陷的可能性。试样在 288°C 下进行单轴全推拉疲劳试验，部分试验在疲劳寿命的各个阶段中断。表面裂纹测量后，通过阴极电解对疲劳损坏的试样进行充氢，并对这些试样进行热脱附分析（TDA）以测量析氢曲线。实验结果表明，随着循环次数的增加，特别是在疲劳寿命的早期阶段，解吸氢的量C _H增加。这无论应变范围和循环次数如何，C _H都与新提出的 Coffin-Manson 型参数 Δ ε _p · N ^0.4密切相关。