Abstract Hydrogen-assisted, fatigue crack-growth in pure iron within a low stress-intensity range was ascribed to the emergence of intergranular fracture, the significance of which was emphasized by increased hydrogen-gas pressure, while conversely mitigated by an elevation of test temperature. Based on conventional thermodynamic theory, a single parameter, GB hydrogen-coverage (θx), was used to derive a systematic, unified evaluation of such a complex reliance on the dual environmental variables. Furthermore, post-mortem microscopic analyses of the crack-wake deformation microstructures were employed to elucidate the contribution of dislocation activity regarding the triggering of IG fracture, which also varied significantly with the alteration of θx.

中文翻译：

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铁素体铸铁中氢辅助的晶间疲劳裂纹扩展：氢气压力和温度变化的影响

摘要 纯铁在低应力强度范围内氢辅助疲劳裂纹扩展归因于晶间断裂的出现，其重要性通过增加氢气压力来强调，而反之通过升高试验温度来减轻。 . 基于传统的热力学理论，使用单一参数 GB 氢覆盖率 (θx) 来对这种对双重环境变量的复杂依赖进行系统、统一的评估。此外，采用裂纹-尾流变形微观结构的验尸显微分析来阐明位错活动对触发 IG 断裂的贡献，其也随着 θx 的变化而显着变化。