Interpretation of complex, tensile-fracture phenomena in precipitation-hardened, martensitic stainless steels, 17-4PH, in presence of hydrogen

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:823

Article

Yamabe, Junichiro^1,2  Sezgin, Jean-Gabriel²  Wada, Kentaro¹ 

[1] Fukuoka Univ, Dept Mech Engn, Jonan Ku, 8-19-1 Nanakuma, Fukuoka 8140180, Japan

[2] Natl Inst Adv Ind Sci & Technol, AIST Kyushu Univ Hydrogen Mat Lab HydroMate, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

关键词: Hydrogen embrittlement;    Steel;    Tensile ductility;    Hydrogen enhanced localized plasticity;    Hydrogen enhanced decohesion;    Hydrogen trapping;   

DOI  :  10.1016/j.msea.2021.141717

来源: Elsevier

【 摘 要 】

Hydrogen-induced ductility loss in two precipitation-hardened, martensitic stainless steels was investigated via tensile testing with internal hydrogen, revealing it to be more significant with a higher hydrogen content or tensile strength. A lower hydrogen content and tensile strength resulted in quasi-cleavage fracture and considerable plastic strain, suggesting that hydrogen-dislocation interaction contributed to the loss in ductility. When either the hydrogen content or the tensile strength increased, the intergranular and cleavage surfaces were incorporated into the quasi-cleavage surface, a phenomenon attributed to the hydrogen-induced reduction of cohesive strength. Such a reduction was confirmed using impact tests at cryogenic temperatures, implying that some mechanisms were responsible for the loss in ductility.

【 授权许可】

Free