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Proceedings Paper

Effect of nitrogen and solidification mode on hot cracking susceptibility in laser welds of austenitic stainless steels
Author(s): Kazutoshi Nishimoto; Hiroaki Mori
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Paper Abstract

Solidification mode in laser welds sometimes exhibits the primary austenite, which enhances hot cracking suceptibility, because of an austenitizing effect of nitrogen and the high solidification rate. Therefore, laser welds of high nitrogen stainless steels likely occurs hot cracking. This investigation was conducted to clarify effects of nitrogen and solidification rate on hot cracking susceptibility in laser welds of austenitic stainless steels varied with nitrogen contents. Hot cracking susceptibility in laser welds was markedly increased with increase in the solidification rate and nitrogen contents. On the other hand, solidification mode in weld metals was changed from primary ferrite to primary austenite, as raising the solidification rate and the nitrogen content in laser welds. Experimental results indicated that the abrupt increase in hot cracking susceptibility is consistent with transition in the solidification mode from primary ferrite to primary austenite in the weld metal. The transition of solidification mode from primary ferrite to primary austenite in laser welds could be estimated by calculation using the modified KGT model considering the effect of nitrogen. These results suggest that hot cracking susceptibility in laser welds of the steels can be also predicted by using the same analytical method of solidification mode in the welds.

Paper Details

Date Published: 3 March 2003
PDF: 10 pages
Proc. SPIE 4831, First International Symposium on High-Power Laser Macroprocessing, (3 March 2003); doi: 10.1117/12.497906
Show Author Affiliations
Kazutoshi Nishimoto, Osaka Univ. (Japan)
Hiroaki Mori, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 4831:
First International Symposium on High-Power Laser Macroprocessing
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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