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首页> 外文期刊>Materials Science and Engineering >On the synergy of diffusible hydrogen content and hydrogen diffusivity in the mechanical degradation of laboratory cast Fe-C alloys
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On the synergy of diffusible hydrogen content and hydrogen diffusivity in the mechanical degradation of laboratory cast Fe-C alloys

机译：实验室铸造Fe-C合金机械降解中可扩散氢含量和氢扩散率的协同作用

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摘要

The present work investigates the influence of hydrogen on the mechanical properties of generic Fe-C alloys by tensile tests on notched samples. Different microstructures, such as pearlite, bainite and martensite are generated in a 0.2%C Fe-C alloy by an appropriate heat treatment "Pure" iron is used as a reference material and a variation in the carbon content up to 0.4% is established for the bainitic grade. The effect of hydrogen is demonstrated by mechanical tests on both in-situ hydrogen charged and uncharged specimens. At high cross-head deformation speed (5mm/min), the results indicate a considerable, though variable hydrogen effect for different microstructures. The bainitic and martensitic materials both show ductility drops of about 20%, whereas the pearlitic and ferritic grades display a higher sensitivity to hydrogen embrittlement (HE) with a ductility loss of approximately 50%. In order to evaluate the role of the diffusible hydrogen, tensile tests are performed at a lower cross-head deformation speed (0.05 mm/min) as well. Next to the correlation between the amount of diffusible hydrogen and HE, the distance over which hydrogen can diffuse during a tensile test, determined by hydrogen diffusion coefficient seems to play a crucial role as well.
机译：本工作通过缺口样品的拉伸试验研究了氢对普通Fe-C合金力学性能的影响。通过适当的热处理在0.2％C的Fe-C合金中生成不同的微结构，例如珠光体，贝氏体和马氏体。“纯”铁用作参考材料，并确定碳含量的最大变化为0.4％，贝氏体等级。氢气的影响通过对原位带电和不带电样品的机械测试证明。在较高的十字头变形速度（5mm / min）下，结果表明，尽管不同的微结构具有可变的氢效应，但仍具有相当大的影响。贝氏体和马氏体材料均显示出约20％的延展性下降，而珠光体和铁素体级对氢脆（HE）表现出更高的敏感性，延展性损失约为50％。为了评估可扩散氢的作用，还以较低的十字头变形速度（0.05毫米/分钟）进行了拉伸试验。除了可扩散氢的量与HE之间的相关性外，由氢扩散系数决定的拉伸试验中氢可扩散的距离似乎也起着至关重要的作用。

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