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http://dx.doi.org/10.3795/KSME-A.2002.26.6.1107

The Characteristics of the Hydrogen Embrittlement for the Cr-Mo Steels in Use of Pressure Vessel  

Lee, Hwi-Won (영남대학교 기계공학부)
Yang, Hyun-Tae (대원과학대학 컴퓨터응용기계설계과)
Kim, Sang-Tae (영남대학교 대학원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.26, no.6, 2002 , pp. 1107-1113 More about this Journal
Abstract
This study presents the hydrogen emblittlement in the metal, which decreases the ductility and then induces the brittle fracture. The contribution deals with the effect of strain rate and notch geometry on hydrogen emblittlement of 1.25Cr-0.5Mo and 2.25Cr-1Mo steels, which are in use at high pressure vessel. Smooth and notched specimens were examined to obtain the elongation and tensile strength. For charging the hydrogen in the metal, the cathodic electrolytic method was used. In this process, current density is maintained constant. The amount of hydrogen penetrated in the specimen was detected by the hydrogen determenator(LECO RH404) with the various charging time. The distribution of hydrogen concentration penetrated in the specimen was obtained by finite element analysis. The amount of hydrogen is high in smooth specimen and tends to concentrate in the vicinity of surface. The elongation and tensile strength decreased with the passage of charging time in 1.25Cr-0.5Mo and 2.25Cr-1Mo steels. The elongation increased and tensile strength decreased as strain rate increased. As a result of this study, it is supposed that 1.25Cr-0.5Mo steel is more sensitive than 2.25Cr-lMo steel in hydrogen embrittlement. Hydrogen embrittlement susceptibility of notched specimen after hydrogen charging is more remarkable than that of smooth specimen.
Keywords
Hydrogen Embrittlement; Cathodic Electrolytic Method; Strain Rate; Diffusion Coefficient; Notch Sensitivity;
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