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Hydrogen-assisted fatigue crack-propagation in a Ni-based superalloy 718, revealed via crack-path crystallography and deformation microstructures
Corrosion Science ( IF 7.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.corsci.2020.108814 Yuhei Ogawa , Osamu Takakuwa , Saburo Okazaki , Yusuke Funakoshi , Saburo Matsuoka , Hisao Matsunaga
Corrosion Science ( IF 7.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.corsci.2020.108814 Yuhei Ogawa , Osamu Takakuwa , Saburo Okazaki , Yusuke Funakoshi , Saburo Matsuoka , Hisao Matsunaga
Abstract Fatigue crack-growth (FCG) of Ni-based superalloy 718 was investigated under gaseous hydrogen environment (external hydrogen) and uniformly pre-charged state (internal hydrogen). Under external hydrogen, intergranular fracture predominated, whereas dislocation slip-band or twin boundary fracture were prevalent under internal hydrogen. This failure mode divergence encompassed unique characteristics of macroscale FCG response, leading to both cycle- and time-dependent cracking. The intergranular cracking was ascribed to short-circuit diffusion of hydrogen along grain boundaries. Meanwhile, the material’s inherently inhomogeneous deformation mode exerts harmfulness when hydrogen was uniformly distributed inside the specimen, causing slip-bands or twin boundaries to become the weakest links for fracture.
中文翻译:
通过裂纹路径晶体学和变形微观结构揭示的镍基高温合金 718 中氢辅助疲劳裂纹扩展
摘要 研究了气态氢环境(外氢)和均匀预充状态(内氢)下Ni基718高温合金的疲劳裂纹扩展(FCG)。外氢作用下,以晶间断裂为主,而内氢作用下,以位错滑带或孪晶界断裂为主。这种失效模式分歧包含宏观 FCG 响应的独特特征,导致周期和时间相关的开裂。晶间开裂归因于氢沿晶界的短路扩散。同时,当氢在试样内部均匀分布时,材料固有的不均匀变形模式会产生危害,导致滑移带或孪晶边界成为断裂的最薄弱环节。
更新日期:2020-09-01
中文翻译:
通过裂纹路径晶体学和变形微观结构揭示的镍基高温合金 718 中氢辅助疲劳裂纹扩展
摘要 研究了气态氢环境(外氢)和均匀预充状态(内氢)下Ni基718高温合金的疲劳裂纹扩展(FCG)。外氢作用下,以晶间断裂为主,而内氢作用下,以位错滑带或孪晶界断裂为主。这种失效模式分歧包含宏观 FCG 响应的独特特征,导致周期和时间相关的开裂。晶间开裂归因于氢沿晶界的短路扩散。同时,当氢在试样内部均匀分布时,材料固有的不均匀变形模式会产生危害,导致滑移带或孪晶边界成为断裂的最薄弱环节。