Effects of nitrogen on weld metal microstructure and toughness in submerged arc welding

被引：4
|
作者：
Bang, Kook-soo [1 ]
Kim, Woo-yeol [1 ]
Park, Chan [1 ]
Ahn, Young-ho [2 ]
Lee, Jong-bong [2 ]
机构：
[1] Pukyong Nat Univ, Div Adv Mat Sci & Engn, Pusan 608739, South Korea
[2] POSCO, Tech Res Lab, Pohang 790785, South Korea
来源：
THERMEC 2006, PTS 1-5 | 2007年 / 539-543卷
关键词：
weld metal; microstructure; toughness; nitrogen;
D O I：
10.4028/www.scientific.net/MSF.539-543.3906
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：3906 / +
页数：2
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