Influence of post-weld heat treatment on the microstructure and hardness of laser weld seams on hot-rolled TRIP 800 steel |
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Authors: | ZUO Dungui and YAN Qi Auto Steel Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai China State |
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Affiliation: | Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel),Shanghai 201900,China |
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Abstract: | The transformation induced plasticity (TRIP) steels effect occurs because of the martensitic transformation of retained austenite during plastic deformation,and it provides the steel with excellent strength and ductility.While welding remains a vital part of auto body manufacturing,the weldability of TRIP steels is problematic,and this prevents its adoption for many applications in the automotive industry.This present work studies the effects of welding and post-weld heat treatment on the microstructure of TRIP steels.It is found that the microstructures of the fusion zone and the heat affected zone (HAZ) are changed after high-temperature heat treatment.Hardness tests revealed that fusion zone hardness decreased with increasing of temperatures in the post-weld heat treatment on the laser weld seam.The rolling performance of the welding seam and the seam of post-weld heat treatment were also studied. |
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Keywords: | TRIP steel laser welding heat treatment microstructure hardness rolling performance |
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