Abstract：In order to study the microstructure and mechanical properties of Cu-NiAl nano co-precipitation strengthened steel tempered at different processes,OM and TEM were used to analyze the microstructure of the experimental steel tempered in the range of 300-650 ℃,and the mechanical properties were discussed. The results show that bainitic ferrite lathes began to coarsen and gradually transformed into equiaxial ferrite,and there were nanoscale precipitates in the matrix at tempering temperature 300-550 ℃. During tempering at 600-650 ℃,lath structure completely transformed to equiaxial ferrite,and nanometer precipitates gradually grew and coarsened. The optimum tempering temperature range for the Cu-NiAl nano co-precipitation strengthening steels was 550-600 ℃.The yield strength was 855-917 MPa,the impact energy tested at -40 ℃ is 77-86 J,and the comprehensive mechanical properties were good.
阚立烨, 叶其斌, 田勇, 王昭东, 王国栋. Cu-NiAl纳米复合析出强化钢回火工艺[J]. 钢铁, 2021, 56(2): 105-109.
KAN Li-ye, YE Qi-bin, TIAN Yong, WANG Zhao-dong, WANG Guo-dong. Tempering process of Cu-NiAl nano co-precipitation strengthened steel[J]. Iron and Steel, 2021, 56(2): 105-109.
[1] 李振团,柴锋,杨才福,等. 淬火工艺对铜沉淀强化UHS钢组织性能的影响[J]. 钢铁,2019,54(6):79.(LI Zhen-tuan,CHAI Feng,YANG Cai-fu,et al. Effect of quenching process on microstructure and mechanical properties of Cu precipitated hardened hardened ultra-high strength steel[J]. Iron and Steel,2019,54(6):79.) [2] 程丙贵,武凤娟,刘东升. 屈服强度785 MPa低碳含铜船板钢的组织和性能[J]. 钢铁,2015,50(8):83.(CHENG Bing-gui,WU Feng-juan,LIU Dong-sheng. Microstructure and mechanical properties of low carbon copper containing steel plate for shipbuilding with yield strength of 785 MPa[J]. Iron and Steel,2015,50(8):83.) [3] Dhua S K,Ray A,Sarma D S. Effect of tempering temperatures on the mechanical properties and microstructures of HSLA-100 type copper-bearing steels[J]. Materials Science and Engineering A,2001,318(1/2):197. [4] Dhua S K,Sen S K. Effect of direct quenching on the microstructure and mechanical properties of the lean-chemistry HSLA-100 steel plates[J]. Materials Science and Engineering A,2011,528(21):6356. [5] ZHANG B X,QIU Y L,LU J. Design and implementation of new multi-functional intelligent single phase meters[J]. Advanced Materials Research,2013,760/761/762(9):1327. [6] Wen Y R,Hirata A,Zhang Z W,et al. Microstructure characterization of Cu-rich nanoprecipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy[J]. Acta Materialia,2013,61(6):2133. [7] WANG X,SHA G,SHEN Q,et al. Age-hardening effect and formation of nanoscale composite precipitates in a NiAlMnCu-containing steel[J]. Materials Science and Engineering A,2015,627:340. [8] Vaynman S,Isheim D,Kolli R P,et al. High-strength low-carbon ferritic steel containing Cu-Fe-Ni-Al-Mn precipitates[J]. Metallurgical and Materials Transactions A,2008,39(2):363. [9] Kapoor M,Isheim D,Vaynman S,et al. Effects of increased alloying element content on NiAl-type precipitate formation,loading rate sensitivity,and ductility of Cu - and NiAl-precipitation-strengthened ferritic steels[J]. Acta Materialia,2016,104:166. [10] Russell K C,Brown M. A dispersion strengthening model based on differing elastic moduli applied to the iron-copper system [J]. Acta Metallurgica,1972,20(7):969. [11] Deschamps A,Militzer M,Poole W J,et al. Precipitation kinetics and strengthening of a Fe-0.8wt%Cu Alloy[J]. ISIJ International,2001,41(2):196.
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