Tailoring hydrogen embrittlement resistance of pure Ni by grain boundary engineering

Qingqing Sun , Jinhua Han , Jiaxing Li , Fahe Cao , Shuai Wang
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引用次数: 2

Abstract

By using thermo-mechanical processing, 99.996 wt.% pure Ni with different grain boundary characteristics were fabricated (Sample #1, 700 ℃ × 10 h + cold rolling reduction 50%+ 650 ℃ × 2 h; Sample #2, 700 ℃ × 10 h + cold rolling reduction 50%+ 900 ℃ × 5 min). Hydrogen embrittlement sensitivity of the two samples was determined by using high-pressure hydrogen charging, low strain rate tensile test and SEM fractography. Compared with Sample #1, hydrogen embrittlement index of Sample #2 increased from 0.52 to 0.71. The effects of grain size, grain boundary type and grain boundary curviness on hydrogen embrittlement of pure Ni were discussed. The results indicate that: 1) special grain boundaries including twin grain boundaries may have a marginal effect on tailoring hydrogen embrittlement resistance in pure Ni; 2) increasing grain boundary curviness is an effective way to improve hydrogen embrittlement resistance of Ni.

用晶界工程剪裁纯Ni的抗氢脆性能
通过热机械加工,制备出99.996 wt.%具有不同晶界特征的纯Ni(样品1号,700℃× 10 h +冷轧还原50%+ 650℃× 2 h;样品2号,700℃× 10 h +冷轧还原50%+ 900℃× 5 min)。通过高压充氢、低应变速率拉伸试验和SEM断口分析,对两种试样的氢脆敏感性进行了测定。与样品1相比,样品2的氢脆指数由0.52提高到0.71。讨论了晶粒尺寸、晶界类型和晶界弯曲度对纯Ni氢脆的影响。结果表明:1)包括双晶界在内的特殊晶界可能对纯Ni的抗氢脆剪裁有边际效应;2)提高晶界弯曲度是提高Ni抗氢脆性能的有效途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
7.30
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