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首页> 外文期刊>ISIJ international >Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel
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Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel

机译：考虑压模和钢中的高强度钢板氢脆评价氢气脆性的方法

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摘要

High strength steel sheets are increasingly being used due to the growing need to improve fuel efficiency by reducing vehicle weight. Steel sheets are usually used as automotive parts formed by pressing, etc., and complicated strain is generated in the steel sheet after forming. This strain is thought to affect the occurrence of hydrogen embrittlement. In this study, a new hydrogen embrittlement evaluation method using a forming limit diagram was devised. A forming limit diagram of a steel sheet with a strength level adjusted to 1 470 MPa was prepared for uniaxial, plane strain and biaxial modes, and stress and hydrogen were applied to the specimens formed with respective strain modes to evaluate the occurrence of fracture. In order to examine the relationship between the hydrogen content and the cracking, evaluation of the hydrogen content by Thermal Desorption Analysis, visualization of hydrogen by Secondary Ion Mass Spectrometry and microstructure analysis by Electron BackScatter Diffraction were carried out. It was found that cracks are generated in the strain mode in which hydrogen accumulates locally in the steel even when the apparent hydrogen content is small, and it was clarified experimentally that evaluation of local hydrogen concentration is important for the evaluation of hydrogen embrittlement.
机译：由于通过还原载体重量，越来越需要提高燃料效率，越来越多地使用高强度钢板。钢板通常用作通过压制等形成的汽车部件，形成后在钢板中产生复杂的应变。认为这种菌株会影响氢脆的发生。在该研究中，设计了一种使用成形限制图的新的氢脆评价方法。为单轴，平面菌株和双轴模式制备调节强度水平的钢板的形成限位图，并将应力和氢施加到用各自应变模式形成的样品中，以评估裂缝的发生。为了检查氢含量与裂化之间的关系，通过热解吸分析评价氢含量，进行二次离子质谱和通过电子背散射衍射的微观结构分析的可视化。发现裂缝在应变模式中产生，其中即使表观氢含量小，氢气在钢中局部积聚，实际上澄清了局部氢浓度的评价对于评估氢脆的评估是重要的。

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