Structure Character of M-A Constituent in CGHAZ of New Ultra-Low Carbon Bainitic Steel under Laser Welding Conditions

J Mater Sci Technol ›› 2006, Vol. 22 ›› Issue (03): 382-386.

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Structure Character of M-A Constituent in CGHAZ of New Ultra-Low Carbon Bainitic Steel under Laser Welding Conditions

Lin ZHAO, Wuzhu CHEN, Xudong ZHANG, Jiguo SHAN

Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China...

Received:2005-09-06 Revised:2005-12-19 Online:2006-05-28 Published:2009-10-10
Contact: Wuzhu CHEN

Abstract

Abstract: 800 MPa grade new ultra-low carbon bainitic (NULCB) steel is the recently developed new generation steel. The microstructure in the coarse-grained heat-affected zone (CGHAZ) of NULCB steel under laser welding conditions was investigated by thermal simulation. The influence of the cooling time from 800℃ to 500℃, t8/5 (0.3~30 s), on the microstructure of the CGHAZ was discussed. The experimental results indicate that the microstructure of the CGHAZ is only the granular bainite which consists of bainitic ferrite (BF) lath and M-A constituent while t8/5 is 0.3~30 s. The M-A constituent consists of twinned martensite and residual austenite, and the change of the volume fraction of the residual austenite in the M-A constituent is very small when t8/5 is between 0.3 and 30 s. The morphology of the M-A constituent obviously changes with the variation of t8/5. As t8/5 increases, the average width, gross and shape parameter of the M-A constituent increase, while the line density of the M-A constituent decreases.

Key words: Laser welding, New ultra-low carbon bainitic steel, Coarse-grained heat-affected zone...

Lin ZHAO, Wuzhu CHEN, Xudong ZHANG, Jiguo SHAN. Structure Character of M-A Constituent in CGHAZ of New Ultra-Low Carbon Bainitic Steel under Laser Welding Conditions[J]. J Mater Sci Technol, 2006, 22(03): 382-386.

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Structure Character of M-A Constituent in CGHAZ of New Ultra-Low Carbon Bainitic Steel under Laser Welding Conditions

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