Microstructure and mechanical properties of keyhole plasma arc welded dual phase steel DP600

In this work, key hole mode plasma arc welding of 6 mm thick DP600 steel plates have been carried out and the effect of post-weld heat treatment is presented. The microstructures of the fusion zone and heat affected zones are studied. The tensile strength of the as-welded joint is found to decrease...

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Bibliographic Details
Published in:Journal of materials processing technology 2019-08, Vol.270, p.28-36
Main Authors: Kuril, Amit A., Janaki Ram, G.D., Bakshi, Srinivasa R.
Format: Article
Language:English
Subjects:
Automobile industry
Base metal
Bend ductility
Bend test
Bend tests
DP600
Dual phase steels
Ductility tests
Duplex stainless steels
Heat affected zone
Heat treating
Impact properties
Keyhole mode plasma arc welding
Martensite
Mechanical properties
Plasma arc welding
Post-weld heat treatment
Reduction (metal working)
Steel plates
Tempered martensite
Weld metal
Welded joints
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Summary:In this work, key hole mode plasma arc welding of 6 mm thick DP600 steel plates have been carried out and the effect of post-weld heat treatment is presented. The microstructures of the fusion zone and heat affected zones are studied. The tensile strength of the as-welded joint is found to decrease by 8%, while the post-weld heat treated weld joint and heat treated base metal showed a 15% reduction compared to as-received DP600. The failure occurred in the far heat affected zone, where softening occurred due to martensite tempering. The impact properties at room temperature were similar for all samples, whereas at −29 °C, the base metal impact property did not decrease while that of weld metal decreased considerably. Bend tests indicated good ductility and formability.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2019.02.018