Effects of Nitrogen on Weld Metal Microstructure and Toughness in Submerged Arc Welding

Abstract:

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The effects of nitrogen content on weld metal impact toughness in submerged arc welding were investigated and interpreted in terms of microstructural changes and solid solution hardening. The weld metal impact toughness in as-welded condition decreased with increasing nitrogen content from 110 to 200 ppm. The weld metal microstructure changed with increasing nitrogen content; ferrite with second phase increased at the expense of tough acicular ferrite. In addition to microstructural changes, the microhardness of acicular ferrite increased gradually with the nitrogen content. Therefore, the loss of impact toughness can be attributed to a combination of the effects of microstructural changes and solid solution hardening.

Info:

Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

3906-3911

DOI:

10.4028/www.scientific.net/MSF.539-543.3906

Citation:

K. S. Bang et al., "Effects of Nitrogen on Weld Metal Microstructure and Toughness in Submerged Arc Welding", Materials Science Forum, Vols. 539-543, pp. 3906-3911, 2007

Online since:

March 2007

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$35.00

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