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http://dx.doi.org/10.5781/JWJ.2016.34.5.61

Solidification Cracking Behavior in Austenitic Stainless Steel Laser Welds (Part 2) -Effects of δ-ferrite Crystallization and Solidification Segregation Behavior on Solidification Cracking Susceptibility-  

Chun, Eun-Joon (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM))
Lee, Su-Jin (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM))
Suh, Jeong (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM))
Kang, Namhyun (Department of Materials Science and Engineering, Pusan National University)
Saida, Kazuyoshi (Division of Materials and Manufacturing Science, Osaka University)
Publication Information
Journal of Welding and Joining / v.34, no.5, 2016 , pp. 61-69 More about this Journal
Abstract
A numerical simulation of the solid/liquid coexistence temperature range, using solidification segregation model linked with the Kurz-Giovanola-Trivedi model, explained the mechanism of the BTR shrinkage (with an increase in welding speed) in type 310 stainless steel welds by reduction of the solid/liquid coexistence temperature range of the weld metal due to the inhibited solidification segregation of solute elements and promoted dendrite tip supercooling attributed to rapid solidification of laser beam welding. The reason why the BTR enlarged in type 316 series stainless welds could be clarified by the enhanced solidification segregation of impurity elements (S and P), corresponding to the decrement in ${\delta}-ferrite$ crystallization amount at the solidification completion stage in the laser welds. Furthermore, the greater increase in BTR with type 316-B steel was determined to be due to a larger decrease in ${\delta}-ferrite$ amount during welding solidification than with type 316-A steel. This, in turn, greatly increases the segregation of impurities, which is responsible for the greater temperature range of solid/liquid coexistence when using type 316-B steel.
Keywords
Laser beam welding; Solidification cracking susceptibility; Solidification segregation; impurity elements; ${\delta}-ferrite$;
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Times Cited By KSCI : 1  (Citation Analysis)
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