Ni-based laser alloyed layer on ductile iron roller surface and its wear properties

doi:10.13251/j.issn.0254-6051.2020.06.046

Abstract

Abstract: Ni-based alloyed layer was prepared on the surface of ductile iron QT600-3 by laser alloying. The phase composition, microstructure, mechanical properties, tribological properties at room temperature and high temperature of the alloyed layer were investigated by means of XRD, SEM, tribological tests and Raman spectrometer. The test results show that Ni-based alloyed layer exhibits good metallurgical bonding to the substrate, high microhardness (up to 720 HV0.1). At high temperature, its friction coefficient is less than 0.305 and wear rate is less than 7.55×10^-6 g·N^-1·m^-1. With the increase of laser scanning speeds, the microstructure becomes more denser, the microhardness increases first and then decreases, and the wear resistance at 700 ℃ increases, but the crack rate of the alloyed layer increases. During high temperature friction and wear experiment, the wear mechanism of the alloyed layer is mainly abrasive wear, fatigue wear and oxidation wear. Also, the increase of scanning speed improves the grain refinement and increases the microhardness. The wear products and carbides produced on the surface of the alloyed layer during high temperature wear play a positive role in improving wear resistance.

Key words: laser alloying, Ni-based alloyed layer, scanning speeds, high temperature wear resistance

CLC Number:

TG174.4

Wang Shuoyu, Zhang Lin, Xie Mingxiang, Ye Wenhu. Ni-based laser alloyed layer on ductile iron roller surface and its wear properties[J]. Heat Treatment of Metals, 2020, 45(6): 220-225.

References

[1]Dai W S, Ma M, Chen J H. The thermal fatigue behavior and cracking characteristics of hot-rolling material[J]. Materials Science and Engineering A, 2007, 448(1/2): 25-32.
[2]刘正林, 田相玉, 费国标. 不同表面处理工艺对轧辊材料耐磨性的影响[J]. 润滑与密封, 2007, 32(4): 6-8.
Liu Zhenglin, Tian Xiangyu, Fei Guobiao. Different surface treatment research on wear resistance of roller material[J]. Lubrication Engineering, 2007, 32(4): 6-8.
[3]丁阳喜, 周立志. 激光表面处理技术的现状及发展[J]. 热加工工艺, 2007, 36(6): 69-72.
Ding Yangxi, Zhou Lizhi. Status and development of laser surface treating[J]. Hot Working Technology, 2007, 36(6): 69-72.
[4]徐晶. 激光亚微米陶瓷合金化涂层的组织及性能研究[D]. 洛阳: 河南科技大学, 2009.
Xu Jing. The Structure and properties of laser alloying layers coated with sub-micron ceramics[D]. Luoyang: Henan University of Science and Technology, 2009.
[5]Yao W J, Niu X L, Zhou L, et al. Competition growth of α and β phases in Ti-50%Al peritectic alloy during the rapid solidification by laser melting technique[J]. Acta Metallurgica Sinica, 2013, 26(5): 523-532.
[6]王福德, 胡乾午, 曾晓雁. ZL108镍基粉末激光表面合金化气孔与裂纹的研究[J]. 应用激光, 2004, 24(5): 265-268.
Wang Fude, Hu Qianwu, Zeng Xiaoyan. Study of the porosity and cracks during laser surface alloying of cast ZL108 aluminium alloy with Ni-base alloy powder[J]. Applied Laser, 2004, 24(5): 265-268.
[7]徐国建, 李宏利, 邢飞, 等. 球墨铸铁轧辊的光纤激光合金化性能[J]. 沈阳工业大学学报, 2015, 37(1): 39-43.
Xu Guojian, Li Hongli, Xing Fei, et al. Fiber laser alloying performance of ductile iron roller[J]. Journal of Shenyang University of Technology, 2015, 37(1): 39-43.
[8]王顺, 胡元中, 王文中, 等. 润滑点接触粗糙表面滑动摩擦因数的试验研究[J]. 润滑与密封, 2006(7): 107-109.
Wang Shun, Hu Yuanzhong, Wang Wenzhong, et al. Experimental research of sliding friction coefficient of rough surface under lubricated point contact[J]. Lubrication Engineering, 2006(7): 107-109.
[9]Wang F. Study of the porosity and cracks during laser surface alloying of cast ZL108 aluminium alloy with Ni-base alloy powder[J]. Applied Laser, 2004, 24(5): 265-268.