CLAM钢焊接热影响区连续冷却过程相变规律

doi:10.3969/j.issn.1001-4381.2013.04.013

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Abstract By means of the physical simulation, the coarse grained zone in heat affected zone (CGHAZ) of CLAM steel during cooling process in the welding thermal cycles was conducted by using of the Gleeble1500 simulator. The effects of cooling rates(ω_c)on microstructure transformation and Vickers hardness were investigated through microscopic observations, hardness tests as well as thermodynamic calculation with Thermo-calc software, and the SH-CCT diagram of the CGHAZ for CLAM steel was finally established. The results showed that the SH-CCT diagram exhibited only two transformation regions, i.e. low-temperature lath martensite (LM) region and high-temperature proeutectic ferrite (α-ferrite) region. 0.25℃/s was the critical cooling rate for phase transformation from supercooled austenite to full martensite. When the ω_c＞0.25℃/s,the microstructure appearances of CGHAZ had no significant changes and consists of lath martensite and a small amount of δ ferrite within this range, the occurrence of δ ferrite was attributed to incomplete δ→γ transformation in the high temperature stage. When the ω_c＜0.25℃/s, the CGHAZ showed dual phase of α-ferrite and lath martensite because of the γ→α transformation. The content of α-ferrite increased with the decreased cooling rate. When the ω_c=0.04℃/s, the microstructure of CGHAZ was completely transformed to α-ferrite and carbides.

Key words： China low activation martensitic steel welding thermal simulation heat-affected zone continuous cooling transformation curve

Received: 21 November 2011 Published: 20 April 2013

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	JIANG Zhi-zhong
	HUANG Ji-hua
	HU Jie
	CHEN Shu-hai

Cite this article:

JIANG Zhi-zhong,HUANG Ji-hua,HU Jie, et al. Continuous Cooling Transformation of CLAM Steel in Heat Affected Zone[J]. Journal of Materials Engineering, 2013, 0(4): 68-73.

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http://jme.biam.ac.cn/EN/10.3969/j.issn.1001-4381.2013.04.013 OR http://jme.biam.ac.cn/EN/Y2013/V0/I4/68

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