Effect of laser power on quenched microstructure and friction and wear properties of 40CrNiMoA steel

doi:10.13251/j.issn.0254-6051.2020.03.025

Abstract

Abstract:

The surface layer of the coiled spindle main shaft 40CrNiMoA steel base material was tested by laser-quenching with different power. The macroscopic structure of cross-section, surface microstructure, microhardness, and friction and wear properties of the specimens were observed or tested by means of stereo microscope, optical microscope, microhardness tester, vertical universal friction and wear tester. The results show that, the surface structure of the laser hardened specimens at different powers exhibit different levels of refining, and compared with the matrix, the hardness and friction and wear properties are improved. When the power is 1600 W, the laser hardened layer can be clearly observed in the cross-section of the specimens, and the surface layer of the specimens is the most detailed, consisting of fine acicular martensite, a small amount of retained austenite and a finely distributed fine carbide, and the surface hardness can reach 640.3-706.8 HV0.2, which is about 2.8 times of that of the substrate. At the same time, the friction coefficient is stable between 0.40 and 0.60, which is about 50% lower than that of the substrate. The amount of wear is 1.3 mg, which is only 36.1% of the substrate. Under the test conditions of spot size with 12 mm×2 mm, scanning speed with 20 mm/s and laser power with 1600 W, the obtained microstructure and friction and wear properties are optimized after surface laser quenching of 40CrNiMoA steel.

Key words: 40CrNiMoA steel, laser quenching, laser power, microstructure, friction and wear

CLC Number:

Yang Zhen, Fan Xiangfang, Qiu Changjun, Li Yong, Liu Ning. Effect of laser power on quenched microstructure and friction and wear properties of 40CrNiMoA steel[J]. HTM, 2020, 45(3): 128-132.

References

[1]Mcdanicls R L, White S A, Liaw K, et al. Effects of a laser surface processing induced heat-affect zone on the fatigue behavior of AISI 4340 steel[J]. Material Science and Engineering A, 2008, 485(1): 500-507.
[2]王敬忠, 李科元, 刘阿娇, 等. 40CrNiMo钢国内外研究现状[J]. 钢铁, 2018, 53(5): 1-10.
Wang Jingzhong, Li Keyuan, Liu Ajiao, et al. Research status of 40CrNiMo steel at home and abroad[J]. Iron and Steel, 2018, 53(5): 1-10.
[3]Puchi-Cabrera E S, Staia M H, Quinto D T, et al. Fatigue properties of a SAE 4340 steel coated with TiCN by PAPVD[J]. International Journal of Fatigue, 2007, 29(3): 471-480.
[4]秦仁耀, 周标, 马瑞, 等. 激光熔化沉积修复40CrNiMoA高强钢的组织与性能[J]. 失效分析与预防, 2018, 13(5): 275-280.
Qin Renyao, Zhou Biao, Ma Rui, et al. Microstructure and properties of 40crnimoa high-strength steel repaired by laser melting deposition[J]. Failire Analysis and Prevention, 2018, 13(5): 275-280.
[5]Zhang S, Cong S, Zhao T, et al. Strengthening and application research of carbo-niobiumizing of 40CrNiMo steel[J]. Heat Treatment of Metals, 2012, 37(3): 99-102.
[6]朱跃峰, 尹永晶, 赵旭平, 等. 石油钻采装备用40CrNiMoA钢的冲击性能[J]. 金属热处理, 2005, 30(10): 39-43.
Zhu Yuefeng, Yin Yongjing, Zhao Xuping, et al. Impact property of 40CrNiMoA steel applied in petroleum equipment[J]. Heat Treatment of Metals, 2005, 30(10): 39-43.
[7]支龙, 陈红斌, 袁满, 等. 回火温度对淬火态40CrNiMoA钢组织与力学性能的影响[J]. 热加工工艺, 2018, 47(18): 200-202.
Zhi Long, Chen Hongbin. Yuan Man, et al. Effects of tempering temperature on microstructure and mechanical properties of quenched 40CrNiMoA steel[J]. Hot Working Technology, 2018, 47(18): 200-202.
[8]王敬忠, 刘阿娇, 李科元, 等. 40CrNiMo钢热变形行为及本构方程[J]. 材料热处理学报, 2018, 39(3): 136-143.
Wang Jingzhong, Liu Ajiao, Li Keyuan, et al. Thermal deformation behavior and constitutive equation of 40CrNiMo steel[J]. Transactions of Materials and Heat Treatment, 2018, 39(3): 136-143.
[9]李永兵, 王健, 左玲立, 等. 复杂曲面结构凸轮槽高频感应淬火工艺及组织与性能[J]. 金属热处理, 2010, 35(11): 70-72.
Li Yongbing, Wang Jian, Zuo Lingli, et al. High-frequency induction quenching process and microstructure and properties of cam slot with complex curved-surface[J]. Heat Treatment of Metals, 2010, 35(11): 70-72.
[10]段松, 秦茶, 李碧波. 激光淬火处理后半高速钢的组织及性能[J]. 金属热处理, 2015, 40(9): 76-78.
Duan Song, Qin Cha, Li Bibo. Microstructure and properties of semi-HSS treated by laser quenching[J]. Heat Treatment of Metals, 2015, 40(9): 76-78.
[11]符轲, 张修庆, 续晓霄, 等. 45钢激光淬火工艺优化及性能[J]. 金属热处理, 2017, 42(1): 154-157.
Fu Ke, Zhang Xiuqing, Xu Xiaoxiao, et al. Process optimization and property analysis of 45 steel by laser quenching[J]. Heat Treatment of Metals, 2017, 42(1): 154-157.
[12]程义远, 王勇, 韩彬, 等. 35CrMoA钢激光淬火-渗氮复合处理微观组织与性能[J]. 中国激光, 2010, 37(1): 250-255.
Cheng Yiyuan, Wang Yong, Han Bin, et al. Microstructure and properties of 35CrMoA steel in laser quenching-nitriding[J]. Chinese Journal of Lasers, 2010, 37(1): 250-255.
[13]侯琦, 刘广鑫, 杨光, 等. MoCr铸铁激光淬火组织及磨损性能研究[J]. 应用激光, 2015, 35(6): 657-660.
Hou Qi, Liu Guangxin, Yang Guang, et al. Study on the microstructure and wear property of MoCr cast iron treated by laser quenching[J]. Applied Laser, 2015, 35(6): 657-660.
[14]李刚, 相珺, 况军, 等. GCr15 钢表面激光淬火的组织与性能[J]. 材料热处理学报, 2010, 31(4): 129-132.
Li Gang, Xiang Jun, Kuang Jun, et al. Microstructure and properties of GCr15 steel treated by laser quenching[J]. Transactions of Materials and Heat Treatment, 2010, 31(4): 129-132.
[15]孔德军, 付贵忠, 王文昌, 等. 激光淬火对40CrNiMo摩擦与磨损性能的影响[J]. 中南大学学报(自然科学版), 2014, 45(3): 714-720.
Kong Dejun, Fu Guizhong, Wang Wenchang, et al. Effects of laser quenching on friction and wear properties of 40CrNiMo[J]. Journal of Central South University(Science and Technology), 2014, 45(3): 714-720.