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首页> 外文期刊>ISIJ international >Cracking Process Related to Hydrogen Behavior in a Duplex Stainless Steel
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Cracking Process Related to Hydrogen Behavior in a Duplex Stainless Steel

机译：双相不锈钢中与氢行为有关的裂化过程

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Cracking process in hydrogen embrittlement (HE) of a duplex stainless steel (DSS) was investigated. Annealed DSS (SUS329J4L) specimens with phase volume fraction of about 50:50 were electrolytically hydrogen-charged and deformed in ambient atmosphere at a strain rate of 1.38×10~(?4) s~(?1). Microcracks were observed mostly to start and pass in the ferrite phase in the course of the deformation. In contrast, austenite phase acted as an obstacle against crack propagation. Delamination was also observed in accord with the authors’ previous study, and the delamination crack also initiated and propagated in ferrite phase. Hydrogen microprint technique (HMPT) revealed that hydrogen atoms migrate mainly in ferrite phase over the distance of the sample thickness. Considering this long diffusion distance of hydrogen, dimpled area observed around the center of the fracture surface was attributable to the sharp increase in the strain rate because of the localized deformation arising from the major crack propagation. HMPT also revealed a marked effect of elastic stress on the acceleration of hydrogen diffusion. Thermal desorption spectroscopy (TDS) confirmed that some of the hydrogen diffuses out during keeping the specimen in the ambient atmosphere, which was accelerated by deformation during keeping presumably by the mechanism of hydrogen transport with gliding dislocations. Furthermore, TDS results demonstrated that the majority of the hydrogen migrated and was trapped by a site with lower binding energy during the deformation.
机译：研究了双相不锈钢（DSS）的氢脆（HE）开裂过程。将相体积分数约为50:50的退火DSS（SUS329J4L）样品电解充氢，并在环境大气中以1.38×10〜（？4）s〜（？1）的应变速率变形。在变形过程中，观察到的微裂纹主要在铁素体相中开始并通过。相反，奥氏体相成为阻止裂纹扩展的障碍。与作者先前的研究一致，也观察到了分层现象，并且分层裂纹也在铁素体相中引发并扩展。氢显微照片技术（HMPT）显示，氢原子主要在样品厚度范围内以铁素体相迁移。考虑到氢的这种长扩散距离，在断裂表面中心附近观察到的凹坑区域归因于应变率的急剧增加，这是由于主要裂纹扩展所引起的局部变形。 HMPT还揭示了弹性应力对氢扩散加速的显着影响。热解吸光谱法（TDS）证实，在将样品保持在环境大气中的过程中，有一些氢扩散出来，而在保持过程中的变形可能是由于氢的滑移位错传输机制所致。此外，TDS结果表明，在变形过程中，大部分氢迁移并被结合能较低的位点捕获。

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