1 200 MPa级冷轧双相钢组织性能及其热塑性

doi:10.11896/j.issn.1005-023X.2018.16.031

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Abstract The 1 200 MPa cold-rolled dual phase steel was designed and manufactured by adopting C-Si-Mn-Cr-Nb and C-Si-Mn-Nb system in laboratory, and its thermoplastic properties were studied. The results showed that after cold rolling, the test steel exhibited the tensile strength of 1 205 MPa and 1 235 MPa, the yield strength of 545 MPa and 530 MPa, the yield ratio of 0.45 and 0.43, and the elongation of 11.5% and 10.5%, respectively. Besides, the C-Si-Mn-Cr-Nb based test steel presented superior mechanical properties to that of C-Si-Mn-Nb based test steel. Moreover, the thermoplastic properties of the test steel were studied by means of thermal simulator. For the two kind of 1 200 MPa cold-rolling dual phase steel under experimental conditions, it can be found that there existⅠ brittle zone and Ⅲ brittle zone in the C-Si-Mn-Nb based test steel, while there exists only Ⅲ brittle zone in C-Si-Mn-Cr-Nb based test steel. Both of the test steels show low thermoplastic property in the range of 600-1 100 ℃ and reach a minimum at 750 ℃, which results from the precipitation of Nb(C, N) and AlN along the austenite grain boundary.

Key words： cold-rolled dual phase steel structure properties thermoplasticity

Published: 18 September 2018

CLC number:

TG162.83

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	Articles by authors
	TANG Xingchang
	ZHANG Wenjuan
	WANG Xiangfei
	ZHANG Zhijian

Cite this article:

TANG Xingchang,ZHANG Wenjuan,WANG Xiangfei, et al. Structure and Thermoplastic Properties on 1 200 MPa Cold-rolled Dual Phase Steel[J]. Materials Reports, 2018, 32(16): 2870-2875.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.16.031 OR http://www.mater-rep.com/EN/Y2018/V32/I16/2870

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