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Frontiers of Mechanical Engineering

Front Mech Eng    2013, Vol. 8 Issue (3) : 298-304     https://doi.org/10.1007/s11465-013-0265-7
RESEARCH ARTICLE
Ductility loss of hydrogen-charged and releasing 304L steel
Yanfei WANG1, Jianming GONG1(), Yong JIANG1, Wenchun JIANG2, Wang JIANG1
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
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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.

Keywords hydrogen embrittlement      ductility loss      hydrogen releasing      control strategy      304L austenitic stainless steel     
Corresponding Author(s): GONG Jianming,Email:gongjm@njut.edu.cn   
Issue Date: 05 September 2013
 Cite this article:   
Yanfei WANG,Jianming GONG,Yong JIANG, et al. Ductility loss of hydrogen-charged and releasing 304L steel[J]. Front Mech Eng, 2013, 8(3): 298-304.
 URL:  
http://journal.hep.com.cn/fme/EN/10.1007/s11465-013-0265-7
http://journal.hep.com.cn/fme/EN/Y2013/V8/I3/298
Fig.1  Dimensions of the specimen in mm
Fig.2  Cathodic hydrogen charging test
Fig.3  Hydrogen concentration under different charging time
Fig.4  Hydrogen concentration under different charging current densities
Fig.5  Stress-displacement curves for unchanged, hydrogen-charged and hydrogen-releasing (HR) 304L under different current densities (mA/cm)
Current densityi/(mA/cm2)Yield strengthσ0.2/MPaTensile strengthσb/MPaElongation δ/%Reduction of area ?/%
H chargedH releasingH chargedH releasing
Uncharged26065572.2/66.60/
1524062469.171.364.8765.37
2523062767.469.860.8863.00
3524561465.269.156.9159.28
5023062162.065.153.9757.70
Tab.1  Mechanical properties of the 304L hydrogen-charged and hydrogen-releasing
Fig.6  , of the hydrogen-charged and hydrogen-releasing (HR) 304L under different current densities
Fig.7  Fracture surface macro SEM morphologies of the uncharged (a) and the hydrogen-charged specimens under current densities of 15 (b), 25 (c) and 35 (d) mA/cm
Fig.8  SEM micrographs at the center of fracture surfaces of the uncharged (a) and hydrogen-charged specimens under different current density of 15 (b) and 35 (c) mA/cm
Fig.9  SEM micrographs at the edge of fracture surfaces of the uncharged (a) and hydrogen-charged specimens under different current density of 15 (b) and 35 (c) mA/cm
Fig.10  SEM micrographs at the edge of fracture surfaces of the hydrogen-releasing specimens under different current densities of 15 (a), 35 (b) and 50 (c) mA/cm
Fig.11  Hydrogen concentration distribution in the specimen for hydrogen charging 96 h and releasing 0, 1, 10 and 180 h
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