退火工艺对Cu-Ni深冲DP钢组织与性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20200045

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Abstract In order to investigate the evolution of microstructure and properties of Cu-Ni alloy deep drawing dual phase steel,continuous cooling transformation behavior and continuous annealing process were studied in the laboratory by using DIL805A/D quenching thermal dilatometer and salt bath furnace. The results show that the phase transformation temperature of Ac1 and Ac3 is 821 ℃ and 969 ℃ respectively. The bainite transformation is occurred at a cooling rate of 0.5-60 ℃/s,and the ferrite transformation is occurred at a cooling rate of 0.5-5 ℃/s,however,the pearlite transformation does not occur when the cooling rate is 3 ℃/s. The microstructure of the tested steel is composed of ferrite and island martensite during annealing at 820-880 ℃. With the increase of annealing temperature,the strength and elongation decrease firstly and then increase,while the r value shows the opposite trend. The tested steel annealed at 880 ℃ obtains the optimum comprehensive mechanical properties with yield strength of 401.2 MPa,tensile strength of 451.4 MPa,elongation of 18.6%,and r value of 1.21.

Key words： Cu alloying deep-drawing dual-phase steel continuous cooling transformation continuous annealing microstructure and mechanical property

Received: 10 February 2020

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	Articles by authors
	ZHANG Teng-fei
	PAN Hong-bo
	SHEN Xiao-hui
	LIU Hai-liang
	LIU Wei-ming
	YAN Jun

Cite this article:

ZHANG Teng-fei,PAN Hong-bo,SHEN Xiao-hui等. Effects of annealing processes on microstructure and mechanical properties of Cu-Ni deep drawing dual-phase steel[J]. Iron and Steel, 2020, 55(10): 75-82.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200045 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I10/75

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