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	Structure character of M-A constituent in CGHAZ of new ultra-low carbon bainitic steel under laser welding conditions
	Zhao, L ; Chen, WZ ; Zhang, XD ; Shan, JG
	2010-05-10 ; 2010-05-10
关键词	laser welding new ultra-low carbon bainitic steel coarse-grained heat-affected zone microstructure M-A constituent RELAXATION REFINEMENT Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering
中文摘要	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 degrees C to 500 degrees C, t(8/5) (0.3 similar to 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 t(8/5) is 0.3 similar to 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 t(8/5) is between 0.3 and 30 s. The morphology of the M-A constituent obviously changes with the variation of t(8/5). As t(8/5) increases, the average width, gross and shape parameter of the M-A constituent increase, while the line density of the M-A constituent decreases.
语种	英语 ; 英语
出版者	JOURNAL MATER SCI TECHNOL ; SHENYANG ; 72 WENHUA RD, SHENYANG 110015, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/24291]
专题	清华大学
推荐引用方式 GB/T 7714	Zhao, L,Chen, WZ,Zhang, XD,et al. Structure character of M-A constituent in CGHAZ of new ultra-low carbon bainitic steel under laser welding conditions[J],2010, 2010.
APA	Zhao, L,Chen, WZ,Zhang, XD,&Shan, JG.(2010).Structure character of M-A constituent in CGHAZ of new ultra-low carbon bainitic steel under laser welding conditions..
MLA	Zhao, L,et al."Structure character of M-A constituent in CGHAZ of new ultra-low carbon bainitic steel under laser welding conditions".(2010).

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