Frontiers of Mechanical Engineering >

2013 , Vol. 8 >Issue 3: 298 - 304

DOI: https://doi.org/10.1007/s11465-013-0265-7

RESEARCH ARTICLE

Ductility loss of hydrogen-charged and releasing 304L steel

  • Yanfei WANG 1 ,
  • Jianming GONG , 1 ,
  • Yong JIANG 1 ,
  • Wenchun JIANG 2 ,
  • Wang JIANG 1
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  • 1. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China
  • 2. College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266555, China

Received date: 10 Jan 2013

Accepted date: 24 Jan 2013

Published date: 05 Sep 2013

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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Abstract

The mechanical properties and fracture behavior of 304L austenitic stainless steel after cathodic hydrogen charging and hydrogen spontaneously releasing are investigated by tensile tests. Flat tensile specimens were cathodic hydrogen charged at various current densities. For each density, two specimens were charged at the same condition. When the charging process completed, one specimen was tensile immediately to fracture and the other was aged to release the hydrogen out of it and then was also tensile to fracture. The resulting tensile properties and micrographs of fracture surfaces of these specimens were evaluated and compared. The results show ductility loss occurred in the hydrogen-charged specimens and the loss increased as the current density increasing. After hydrogen releasing, the specimens recovered a certain extent but not all of its original ductility. Scanning electron microscope (SEM) micrographs of fracture surfaces reveal that irreversible damage had developed in the hydrogen-releasing specimens during the releasing process rather than the charging process. This consequence can be ascribed to the high tensile stress caused by non-uniform hydrogen distribution during hydrogen releasing.

Key words： hydrogen embrittlement; ductility loss; hydrogen releasing; control strategy; 304L austenitic stainless steel

Cite this article

Yanfei WANG , Jianming GONG , Yong JIANG , Wenchun JIANG , Wang JIANG . Ductility loss of hydrogen-charged and releasing 304L steel[J]. Frontiers of Mechanical Engineering, 2013 , 8(3) : 298 -304 . DOI: 10.1007/s11465-013-0265-7

Acknowledgments

The research is sponsored by the Innovation Project for College Graduates of Jiangsu Province in China (CXZZ11_0335).

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