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Strong resistance to hydrogen embrittlement via surface shielding in multi-layered austenite/martensite steel sheets
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.msea.2020.140319
Min Cheol Jo , Min Chul Jo , Jisung Yoo , Taejin Song , Sang-Heon Kim , Seok Su Sohn , Sunghak Lee

Layered architectures have been applied to twinning-induced plasticity (TWIP) steel in terms of configuring multi-layered TWIP and martensitic steel (MLS) sheets to overcome the limitation of low yield strength. However, hydrogen embrittlement (HE) inevitably appears in materials used for high-strength purposes, with the interfacial layers presenting localization sites of hydrogen, thereby limiting the materials’ broad structural applications. Here, we present a novel design for MLS sheets that exhibit both strong resistance to HE and a good strength–ductility balance via surface shielding. Our hydrogen penetration data demonstrates that the proposed austenitic shielding structure effectively acts as a barrier to hydrogen due to the reduced hydrogen diffusivity, compared with existing MLS sheets. We propose the optimal surface thickness required to play the role of shielding layer based on the quantified diffusivity and the rule of mixtures of the layer fractions, which presents a plausible novel design for layered architectures that exhibit strong resistance to HE and possess tunable mechanical properties.



中文翻译:

多层奥氏体/马氏体钢板通过表面屏蔽具有很强的抗氢脆性

就构造多层TWIP和马氏体钢(MLS)板而言,分层体系结构已应用于孪生感应塑性(TWIP)钢,以克服低屈服强度的限制。然而,在用于高强度目的的材料中不可避免地出现氢脆(HE),并且界面层呈现氢的局部位点,从而限制了材料的广泛结构应用。在这里,我们为MLS板材提供了一种新颖的设计,该板材既具有很强的HE抗性,又具有通过表面屏蔽实现的良好的强度-延展性平衡。我们的氢渗透数据表明,与现有的MLS板材相比,由于降低的氢扩散率,拟议的奥氏体屏蔽结构有效地充当了氢的屏障。

更新日期:2020-09-25
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