Influence of Ni on the Microstructure and Mechanical Properties of HSLA Steel Welds

doi:2012.30.4.339

J Weld Join > Volume 30(4); 2012 > Article

Research Paper

Journal of KWJS 2012;30(4):339-344.
DOI: https://doi.org/10.5781/KWJS.2012.30.4.339 Published online October 11, 2012.

고강도 저합금강 용접금속의 미세조직과 기계적 특성에 미치는 니켈 함량의 영향

Influence of Ni on the Microstructure and Mechanical Properties of HSLA Steel Welds

Abstract

The microstructure and mechanical properties of the high-strength low-alloy steel weld metals with a variation of nickel content were investigated. The weld metals with a variation of nickel content from 2.3 to 3.3 wt% were prepared using Gas Metal Arc Welding process. The amount of acicular ferrite decreased with increasing nickel content; this is accompanied with an increase in the region of bainite and martensite, hence the hardness and tensile strengths were increased with the increase in nickel content, whereas the impact energy was deteriorated.

Key Words: Weld metal, Acicular ferrite, Nickel, Impact toughness