Nb、Ti微合金钢中碳氮化物固溶与再析出的研究

doi:10.11896/j.issn.1005-023X.2017.02.023

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Abstract The effect of reheating temperature, austenite deformation temperature and transformation temperature on mechanical property, solid solution and re-precipitation of Nb,Ti carbonitrides in Nb/Ti microalloyed steels were investigated by optical microscope (OM) and transmission electron microscope (TEM). Results showed that there had been a noticeable refinement in the microstructure in Nb microalloyed steel,as carbonitrides of niobium re-pricipitated during austenite deformation,inhibited austenite recrystalization, and acted as a grain refiner during subsequent microstructure revolution. The addition of Ti enhanced the strength of steel obviously, but had little effect on the microstructure refinement. Obvious grain refinement strengthening and precipitation strengthening can be confirmed in Nb-Ti microalloyed steel,both of which brought benefit to steel′s strength. Grain refinement strengthening improved the toughness of experimental steel, while on the contrary precipitation strengthening deteriorated the toughness.

Key words： microalloyed steel carbonitride grain refinement strengthening precipitation strengthening microstructure evolution

Published: 25 January 2017 Online: 2018-05-02

CLC number:

TG142.1

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	Articles by authors
	LI Xiaolin
	XIAO Baoliang
	CUI Yang
	LI Fei
	ZHANG Dawei
	MIAO Chengliang
	ZHANG Xu
	ZHU Tengwei

Cite this article:

LI Xiaolin,XIAO Baoliang,CUI Yang, et al. Solid Solution and Re-precipitation of Carbonitride in Nb,Ti-microalloyed Steel[J]. Materials Reports, 2017, 31(2): 105-111.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.02.023 OR https://www.mater-rep.com/EN/Y2017/V31/I2/105

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