Hydrogen distribution and segregation in hydrogen-charged S30408 after fracture analyzed via scanning Kelvin probe force microscopy

Hydrogen distribution and segregation in hydrogen-charged S30408 after fracture analyzed via scanning Kelvin probe force microscopy
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通过扫描开尔文探针力显微镜分析充氢 S30408 断裂后的氢分布和偏析

DOI:
10.1016/j.apsusc.2020.147050
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发表时间:
2020-06
影响因子:
6.7
通讯作者:
Hua Zhengli
Hua Zhengli
中科院分区:
材料科学1区
文献类型:
--
作者:
Shang Juan;Hua Zhengli

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扫描开尔文探针力显微镜已用于研究 S30408 不锈钢伸长至断裂后的氢分布和偏析。结果表明,充氢的S30408发生严重的氢脆,并且氢致裂纹出现在马氏体(α')以及α'和奥氏体(γ)边界附近。由于 α' 中的氢过多,氢聚集在应变诱导的 α' 附近的 γ 中。此外,许多氢原子被困在α'中。 α'处或α'与γ相界附近的氢偏聚是这些位置出现裂纹的原因之一。
Scanning Kelvin probe force microscopy has employed to investigate hydrogen distribution and segregation in S30408 stainless steel after elongated to fracture. Results reveal that hydrogen-charged S30408 undergoes severe hydrogen embrittlement, and hydrogen-induced cracks occur in martensite (α’) and near the boundaries between α’ and austenite (γ). Hydrogen gathers in the γ near the strain-induced α’ due to the excess hydrogen in the α’. Furthermore, many hydrogen atoms are trapped in α’. The hydrogen segregation in α’ or near the phase boundaries between α’ and γ is one of the reasons for the cracks appearing at these positions.
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