Effect of niobium on microstructure and properties of high strength 51CrV steel

doi:10.13251/j.issn.0254-6051.2021.01.018

Abstract

Abstract: Effect of niobium addition on austenite grain size,quenching and tempering microstructure and mechanical properties of 51CrV steel was observed by means of optical microscope,scanning electron microscope,transmission electron microscope and universal tensile testing machine.The results show that the austenite grain size of Nb free and 0.02wt%Nb steels is 10.0 μm and 3.1 μm,respectively.The grain size of 51CrV steel with Nb element is significantly refined,the size of lath martensite reduces,and the size of carbide precipitated during tempering is finer.After quenching at 850 ℃ and tempering at 400 ℃,both the yield strength and tensile strength of the two tested steels are greater than 1300 MPa and 1400 MPa,respectively.The elongation of 0.02wt%Nb tested steel increases to 9.50% because of the grain refinement.And the elongation of Nb free steel is 8.69%.51CrV steel microalloyed by Nb element has both high strength and high plasticity and its comprehensive properties are better than Nb-free steel.

Key words: 51CrV steel, niobium, microstructure, mechanical properties

CLC Number:

TG156.1

Wang Jiamin, Cao Yu, Xiang Haoliang, Cao Xiangzhi, Song Xinli, Liu Zhongzhu. Effect of niobium on microstructure and properties of high strength 51CrV steel[J]. Heat Treatment of Metals, 2021, 46(1): 92-96.

References

[1] 王伟,朱林,胡平,等.热处理对高速列车用51CrV4弹簧钢力学性能的影响[J].金属热处理,2010,35(2):58-62.
Wang Wei,Zhu Lin,Hu Ping,et al.Effect of heat treatment on mechanical properties of 51CrV4 spring steel for high speed trains[J].Heat Treatment of Metals,2010,35(2):58-62.
[2] 邢献强.国产汽车用低合金弹簧钢线材的现状[J].金属制品,2010,36(6):34-39.
Xing Xianqiang.Present situation of low alloy spring steel wire rod for domestic automobile[J].Metal Product,2010,36(6):34-39.
[3] 韩伟旗,张素萍,郑永瑞,等.轿车悬架簧用弹簧钢线材的生产实践[J].金属制品,2009,35(5):31-33.
Han Weiqi,Zhang Suping,Zheng Yongrui,et al.Production practice of wire rod for automobile suspension spring[J].Metal Products,2009,35(5):31-33.
[4] 丁灿灿,曹燕光,杨俊伟,等.奥氏体化温度对51CrV4钢组织及疲劳性能的影响[J].钢铁研究学报,2018,30(12):991-997.
Ding Cancan,Cao Yanguang,Yang Junwei,et al.Effect of austenitizing,temperature on microstructure and fatigue properties of 51CrV4 steel[J].Journal of Iron and Steel Research,2018,30(12):991-997.
[5] 罗迪强,谢飞鸣,汪志刚,等.高品质弹簧钢51CrV4的高温塑性研究[J].材料导报,2016,30(6):90-94.
Luo Diqiang,Xie Feiming,Wang Zhigang,et al.Hot ductility behavior of high quality 51CrV4 spring steels[J].Materials Reports,2016,30(6):90-94.
[6] 曾斌,李昭东,孙新军,等.新型锯片基体用钢51CrV4的研究与开发[J].钢铁,2016,51(2):78-83.
Zeng Bin,Li Zhaodong,Sun Xinjun,et al.Research and development of 51CrV4 as a novel welded saw blade steel[J].Iron and Steel,2016,51(2):78-83.
[7] 宫德海,马永涛,王小军,等.淬火温度对51CrV4弹簧钢组织及性能的影响[J].河北冶金,2019(12):20-23.
Gong Dehai,Ma Yongtao,Wang Xiaojun,et al.Effect of quenching temperature on structure and properties of 51CrV4 spring steel[J].HeBei Metallurgy,2019(12):20-23.
[8] Leire G S,Beatriz L,Beatriz P,et al.Effect of coiling conditions on the strengthening mechanisms of Nb microalloyed steels with high Ti addition levels[J].Materials Science and Engineering A,2019,748:386-395.
[9] Dey I,Chandra S,Saha R,et al,Effect of Nb micro-alloying on microstructure and properties of thermomechanically processed high carbon pearlitic steel[J].Materials Characterization,2018,140:45-54.
[10] 沈奎,江卓俊,于学森,等.微合金化铌钒对高碳钢组织转变影响[J].特殊钢,2019,40(4):62-65.
Shen Kui,Jiang Zhuojun,Yu Xuesen,et al.Effect of Nb-V microalloying on phase transformation behavior of high carbon steel[J].Special Steel,2019,40(4):62-65.
[11] 孙曼丽,江波,陈刚,等.Nb微合金化对高碳钢组织和性能的影响[J].金属热处理,2016,41(4):71-74.
Sun Manli,Jiang Bo,Chen Gang,et al.Efffect of Nb microalloying on microstructure and mechanical properties of high carbon steel[J].Heat Treatment of Metals,2016,41(4):71-74.
[12] 雍歧龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006.
[13] 胡保全.金属热处理原理与工艺[M].北京:中国铁道出版社,2017.
[14] 吴斯,李秀程,张娟,等.Nb对中碳钢相变和组织细化的影响[J].金属学报,2014,50(4):400-408.
Wu Si,Li Xiucheng,Zhang Juan,et al.Effect of Nb on transformation and microstructure refinement in medium carbon steel[J].Acta Metallurgica Sinica,2014,50(4):400-408.
[15] 吴丹.时速300 km以上高铁制动盘用钢的成分、组织与性能研究[D].北京:北京科技大学,2018.
[16] 李元元,蔡东东,程晓敏,等.热处理工艺对51CrV4弹簧钢组织与性能的影响[J].材料热处理学报,2018,39(7):55-63.
Li Yuanyuan,Cai Dongdong,Cheng Xiaomin,et al.Effect of heat treatment process on microstructure and properties 51CrV4 spring steel[J].Transactions of Materials and Heat Treatment,2018,39(7):55-63.
[17] Huang H H,Yang G W,Zhao G,et al.Effect of Nb on the microstructure and properties of Ti Mo microalloyed high strength ferrite steel[J].Materials Science and Engineering A,2018,736:148-155.
[18] 程四华,周德,孔祥涛,等.Nb微合金化对高碳钢线材组织和性能的影响[J].轧钢,2017,34(3):7-11.
Chen Sihua,Zhou De,Kong Xiangtao,et al.Effect of microstructure and properties of Nb microalloyed high carbon steel wire rod[J].Steel Rolling,2017,34(3):7-11.
[19] 韩孝永.铌、钒、钛在微合金钢中的作用[J].宽厚板,2006,12(1):39-41.
Han Xiaoyong.Functions of Nb,V and Ti in micro-alloyed steel[J].Wide and Heavy Plate,2006,12(1):39-41.