Effect of Oxygen Content on Cold Cracking Susceptibility in Weld Metal of High Strength Steel(Materials, Metallurgy & Weldability)
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The purpose of this investigation is to make clear the effects of oxygen on cold cracking susceptibilities in weld metals of high strength steels. Therefore, in this study, cold cracking susceptibilities in weld metals of HY130 steel where oxygen content changes in the range 15-210 ppm were evaluated and then, in particular, the metallurgical characteristics in weld metal such as solidification behavior, microstructure, inclusion, formation and migration of austenite boundary etc. were systematically studied. Consequently, cold cracking susceptibility and intergranular fracture in weld metal increased with an increase in oxygen content. The cause of this result was inferred that many inclusions which were related to diffusible hydrogen were situated near prior-austenite boundary, because inclusions crystallizing on solidification boundary hindered the migration of austenite boundary.
- Transactions of JWRI
Transactions of JWRI 14(2), 335-342, 1985-12