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

Abstract:

Article Preview

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

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

Export:

Price:

$38.00

[1] G. den Ouden, J.G. Verhagen and G.W. Tichelaar: Weld. J. Vol. 54 (1975), 87s.

[2] W.B. Morrison: Iron and Steelmaking Vol. 6 (1989), p.123.

[3] G.M. Evans and N. Bailey: Metallurgy of Basic Weld Metal (Abington Publishing, Cambridge 1997).

[4] Y. Ito, M. Nakanishi and Y. Komiz: Sumitimo Search, No. 21 (1979), p.52.

[5] K. -s. Bang and H. -s. Jeong: Mat. Sci. and Tech. Vol. 18 (2002), p.649.

[6] D.R.G. Achar, M. Kocak and G.M. Evans, in: Trends in Welding Science and Technology, edited by S. David and J. Vitek, ASM Int'l (1992), p.327.

[7] N. Mori, H. Homma, S. Okita and M. Wakabayashi: IIW Doc. IX-1196-81.

[8] T. Koshino, M. Otawa, T. Tanigaki, T. Takino, Y. Horii, E. Tsunetomi and K. Imai: IIW Doc. II955-81 50 100 150 200 250 160 170 180 190 200 210 220 230 Hardness of acicular ferrite (HV0. 5) Weld metal nitrogen content (ppm).

Fetching data from Crossref.
This may take some time to load.