Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Microstructure and Mechanical Property in the Weld Heat-affected Zone of V-added Austenitic Fe-Mn-Al-C Low Density Steels

  • Moon, Joonoh (Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science) ;
  • Park, Seong-Jun (Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science)
  • Received : 2015.08.03
  • Accepted : 2015.10.01
  • Published : 2015.10.01
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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 $1200^{\circ}C$ 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.

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References

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