Microstructure and Mechanical Property in the Weld Heat-affected Zone of V-added Austenitic Fe-Mn-Al-C Low Density Steels

Moon, Joonoh; Park, Seong-Jun

doi:2015.33.5.31

JWJ > Volume 33(5); 2015 > Article

Research Paper

Journal of Welding and Joining 2015 October;33(5) :31-34.
Published online October 30, 2015.

doi:https://doi.org/10.5781/JWJ.2015.33.5.31

Microstructure and Mechanical Property in the Weld Heat-affected Zone of V-added Austenitic Fe-Mn-Al-C Low Density Steels

Joonoh Moon^*, Seong-Jun Park^*

^*Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon 642-831, Korea

Correspondence: Joonoh Moon Email: mjo99@kims.re.kr
Published online October 30, 2015

ABSTRACT

Microstructure and tensile property in the weld heat-affected zone (HAZ) of austenitic Fe-Mn-Al-C low density steels were investigated through transmission electron microscopy analysis and tensile tests. The HAZ samples were prepared using Gleeble simulation with high heat input welding condition of 300 kJ/cm, and the HAZ peak temperature of 1200℃ was determined from differential scanning calorimetry (DSC) test. The strain- stress responses of base steels showed that the addition of V improved the tensile and yield strength by grain refinement and precipitation strengthening. Tensile strength and elongation decreased in the weld HAZ as compared to the base steel, due to grain growth, while V-added steel had a higher HAZ strength as compared than V-free steel.

Keywords: Low density steel | Heat-Affected Zone (HAZ) | Grain refinement | Precipitation strengthening Vanadium carbide