Varestraint Test for Solidification Crack Susceptibility in Weld Metal of Austenitic Stainless Steels

概要

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The Varestraint Test (Longitudinal Varestraint Test) was used to evaluate the susceptibility to hot cracking of ten commercial austenitic stainless steels (17 to 25% Chromium and 8 to 20% Nickel) which contain different amount of δ-ferrite in austenitic phase. As it is known from literatures or practical experiences, the austenitic stainless steels containing 5 to 10% δ-ferrite at room temperature are more resistant to hot cracking than fully austenitic stainless steels. The purpose of this investigation was to clarify the resistance to hot cracking in the weld metals and the HAZ that contain controlled amount of δ-ferrite as mentioned above, using the Varestraint Test. Furthermore, the effect of nitrogen, which is a strong austenitizer, on hot crack susceptibility of weld metals was investigated. The authors found that the tendency of hot crack susceptibility of the weld metal and HAZ agreed with the order that has been described in the literatures and has been experienced in practical use, and that the weld metal became more susceptible to hot cracking when some amount of nitrogen was contained.
大阪大学の論文