前驱体对含Cu低碳钢I&Q&P处理后组织性能的影响

doi:10.11896/j.issn.1005-023X.2017.06.021

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Abstract Effect of different precursor microstructure on retained austenite and mechanical properties of a Cu bearing low-carbon steel was studied by means of scanning electron microscopy (SEM),electron microprobe analysis (EPMA) and X-ray diffraction (XRD). The results showed that austenite nucleation and growth were controlled by C partition in initial stages and Mn, Cu partition in the later stages of intercritical annealing. The effect of Mn, Cu enrichment formed in the intercritical partitioning was retained after austenitizing. The rigion could form retained austenite easily in the quenching and C partitioning stages subsequent. After I&Q&P heat treatment, the steel with ferrite + pearlite (P+F) precursor could obtain the coarser martensite lath, but the original austenite grain boundary was not obvious. The steel with ferrite + martensite (P+M) precursor could obtain the orderd martensite lath and the lath was fine; While the martensite (M) precursor steel could obtain a microstructure of more refined martensite lath. After I&Q&P heat treatment, the steel with M precursor had the most volume fraction of retained austenite. The elongation of this kind of steel was up to 24.1%, and thus the product of strength and elongation was 25 338 MPa·%, the mechanical properties was the best.

Key words： Cu bearing low-carbon steel I& Q& P process precursor microstructure retained austenite mechanical properties

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

CLC number:

TG142.1

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	Articles by authors
	CHEN Liansheng
	CAO Hongzi
	TIAN Yaqiang
	SONG Jinying
	WEI Yingli
	ZHENG Xiaoping

Cite this article:

CHEN Liansheng,CAO Hongzi,TIAN Yaqiang, et al. Influence of Precursor on Microstructure and Mechanical Property of a Cu
Bearing Low-carbon Steel by I&Q&P Treatment[J]. Materials Reports, 2017, 31(6): 105-109.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.06.021 OR https://www.mater-rep.com/EN/Y2017/V31/I6/105

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