The finding of crystallographic orientation dependence of hydrogen diffusion in austenitic stainless steel by scanning Kelvin probe force microscopy

SCRIPTA MATERIALIA

卷:131

Article

Hua, Zhengli^1,2  An, Bai²  Iijima, Takashi²  Gu, Chaohua¹  Zheng, Jinyang¹ 

[1] Zhejiang Univ, Inst Proc Equipment, Hangzhou 310027, Zhejiang, Peoples R China

[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058569, Japan

关键词: Scanning Kelvin probe force microscopy (SKPFM);    Hydrogen segregation and diffusion;    Austenitic stainless steel;    Crystallographic orientation;    EBSD;   

DOI  :  10.1016/j.scriptamat.2017.01.003

来源: Elsevier

【 摘 要 】

A combination of scanning Kelvin probe force microscopy (SKPFM) and electron backscatter diffraction (EBSD) has been applied to investigate the hydrogen release from thermally hydrogen-precharged type 304 austenitic stainless steel (gamma-SS). The evolution of contact potential difference (CPD) well exhibits the evolution of hydrogen concentration in the near surface area. It is found for the first time that the hydrogen diffusivity in gamma-SS depends on the crystallographic orientation. The hydrogen diffusion out from (001) and (101) grains is faster than from (111) grains while no obvious difference is found between (001) and (101) grains. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free