Effects of annealing processes on microstructure and mechanical properties of Cu-Ni deep drawing dual-phase steel
ZHANG Teng-fei1,2, PAN Hong-bo1,2, SHEN Xiao-hui3, LIU Hai-liang4, LIU Wei-ming1,2, YAN Jun1,2
1. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education, Anhui University of Technology, Ma′anshan 243002, Anhui, China; 2. Anhui Province Key Laboratory of Metallurgical Engineering and Resources Recycling, Ma′anshan 243002, Anhui, China; 3. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243002, Anhui, China; 4. Department of Chemistry, Xi′an Jiaotong-Liverpool University, Suzhou 215123, Jiangsu, China
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.
张腾飞, 潘红波, 沈晓辉, 刘海亮, 刘伟明, 闫军. 退火工艺对Cu-Ni深冲DP钢组织与性能的影响[J]. 钢铁, 2020, 55(10): 75-82.
ZHANG Teng-fei, PAN Hong-bo, SHEN Xiao-hui, LIU Hai-liang, LIU Wei-ming, YAN Jun. 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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2020, Vol. 55 
