Abstract The design of an electrochemical permeation device on a tensile machine has allowed to control the hydrogen flux and to isolate the effects of trapped and mobile hydrogen on the hydrogen embrittlement of a martensitic steel. Based on a local approach of fracture, tensile tests on several notched specimens were completed in order to investigate the impact of hydrostatic stress, equivalent plastic strain, hydrogen concentration and flux on the damage processes. Analysis of the fracture surfaces revealed that trapped hydrogen favors ductile fracture, enhancing nucleation and growth of voids by reducing the interface energy between precipitates/inclusions and matrix. Mobile hydrogen leads to quasi-cleavage along the substructure (lath and/or blocks) boundaries at mainly the {101} planes. For both mechanisms, the mutual interaction between hydrogen and dislocations (drag process increasing hydrogen diffusion and hydrogen favoring dislocations mobility) has a large contribution to the hydrogen embrittlement of the martensitic steel.

中文翻译：

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塑性和氢通量在回火马氏体钢断裂中的作用：一种新的机械试验设计，直至断裂，以分离移动和深困氢的影响

摘要 拉伸机上电化学渗透装置的设计允许控制氢通量并隔离捕获和移动的氢对马氏体钢氢脆的影响。基于局部断裂方法，完成了几个缺口试样的拉伸试验，以研究静水应力、等效塑性应变、氢浓度和通量对损伤过程的影响。断裂表面的分析表明，截留的氢有利于延展性断裂，通过降低析出物/夹杂物和基体之间的界面能来增强空洞的成核和生长。流动的氢导致主要在 {101} 面的子结构（板条和/或块）边界发生准解理。对于这两种机制，