TITLE

Effects of Hydrogen on Stress Corrosion Cracking Behavior of Ultra-High Strength Steel 23Co14Ni12Cr3Mo

AUTHOR(S)
Chen WEN; Mei YU; Songmei LI; Xiangcheng LI; Jianhua LIU
PUB. DATE
October 2014
SOURCE
International Journal of Electrochemical Science;2014, Vol. 9 Issue 10, p5803
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Susceptibility of 23Co14Ni12Cr3Mo ultra-high strength steel to stress corrosion cracking (SCC) in a 3.5% NaCl solution was studied with different hydrogen charging specimens by using slow strain rate tests (SSRT), constant load tests (CL) and electrochemical evaluations. The fracture morphologies were characterized by SEM and optical cameras. It is shown that as hydrogen charging time (Th) increases from 0h to 72h, the yield strength decreases from 1606MPa to 957MPa, and failure time (Tf) from 1.65x105s to 9.91x104s by SSRT. Tf decreases from 57h to 43h with increasing Th by CL. Compared the specimen of 72h with that of 0h, the fracture surface of 72h shows a bigger transgranular fracture region by SSRT, and a toughness transgranular fracture for the specimen of 0 h. While brittle fractures with micro porous morphology for that of 72h by CL, which indicates that hydrogen improve the brittleness of 23Co14Ni12Cr3Mo steel. The effects of hydrogen on stress corrosion cracking and electrochemical behaviors were discussed by hydrogen defects.
ACCESSION #
97184967

 

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