Cr12MoV钢表面激光熔覆多层Ni基合金涂层的组织及性能

doi:10.13251/j.issn.0254-6051.2020.12.033

摘要/Abstract

摘要： 使用脉冲Nd:YAG激光器在Cr12MoV模具钢表面熔覆了Ni20Cr和Ni60A多层Ni基合金耐磨涂层,并使用X射线衍射仪、扫描电镜及能谱仪分析了涂层的物相和显微组织。同时运用显微维氏硬度计以及高速往复摩擦磨损试验机对比分析了涂层与基体的硬度及耐磨性。结果表明,采用Ni20Cr作为打底层的多层Ni基合金涂层,能有效改善涂层与基体的冶金结合,大大减少涂层中的裂纹、气孔等缺陷。涂层表面物相主要为g-(Fe, Ni)、FeNi₃、BNi₃、Cr₃C₂以及Ni-Cr-Fe;涂层底部至表面的组织为胞状树枝晶、柱状树枝晶、择优生长树枝晶以及等轴树枝晶。Ni60A涂层大大提高了Cr12MoV模具钢的表面硬度,涂层表面显微硬度最高可达到1000 HV0.2,是基体的1.6倍。Ni60A涂层耐磨损性能明显优于基体,较基体提高了2.0~3.3倍。在Cr12MoV模具钢表面激光熔覆多层Ni基合金涂层后,形成了Cr₃C₂、Ni-Cr-Fe等硬质相,可有效提高其表面的硬度和耐磨性,起到降低模具在使用过程中因摩擦磨损而报废的概率,从而进一步延长模具的使用寿命。

关键词: Cr12MoV钢, 激光熔覆, Ni基涂层, 组织, 力学性能

Abstract: Ni20Cr and Ni60A multi-layer Ni-based alloy wear resistant coating was prepared by laser cladding on the surface of Cr12MoV die steel by pulsed Nd:YAG laser, the phases and microstructure of the coatings were analyzed by using X-ray diffractometer, scanning electron microscope, and energy spectrometer, meanwhile the hardness and wear resistance of both the coating and the substrate were analyzed by using Vickers microhardness tester, high-speed reciprocating friction and wear tester. The results show that using the Ni20Cr as the underlying layer of the multi-layer alloy coating can effectively improve the metallurgical bond between the coating and the substrate, which can greatly reduce the defects such as cracks and pores in the coating. The main phases of the coating surface are g-(Fe, Ni), FeNi₃, BNi₃, Cr₃C₂ and Ni-Cr-Fe. The structure of the coating from bottom to surface in turn is cellular dendrites, columnar dendrites, preferentially growing dendrites and equiaxed dendrites. The Ni60A coating can greatly improve the surface microhardness of Cr12MoV die steel, and the microhardness of the coating surface can reach up to 1000 HV0.2, which is about 1.6 times of the substrate. The wear resistance of the Ni60A coating is obviously better than that of the substrate, which is about 2.0 to 3.3 times higher than that of the substrate. After laser cladding of the multi-layer Ni-based alloy coating on the Cr12MoV die steel surface, hard phases such as Cr₃C₂ and Ni-Cr-Fe can be formed and effectively improve the surface hardness and wear resistance. The probability of scrapping due to friction and wear can be significantly reduced, thereby further extending the service life of the mold.

Key words: Cr12MoV steel, laser cladding, Ni-based alloy coating, microstructure, mechanical properties

中图分类号:

TG174.442

沈大臣, 叶宏, 汪砚青, 刘越, 李礼, 肖鑫羽, 佘红艳. Cr12MoV钢表面激光熔覆多层Ni基合金涂层的组织及性能[J]. 金属热处理, 2020, 45(12): 169-174.

Shen Dachen, Ye Hong, Wang Yanqing, Liu Yue, Li Li, Xiao Xinyu, She Hongyan. Microstructure and properties of laser clad multi-layer Ni-based coating on Cr12MoV steel surface[J]. Heat Treatment of Metals, 2020, 45(12): 169-174.

参考文献

[1] Kong Dejun, Xie Chunyang.Effect of laser quenching on fatigue properties and fracture morphologies of boronized layer on Cr12MoV steel[J]. International Journal of Fatigue, 2015, 80: 391-396.
[2] 袁涛, 蔡养川, 罗震, 等. Al₂O₃陶瓷颗粒对镍基合金涂层耐磨性能的影响[J]. 上海交通大学学报, 2016, 50(10): 1635-1639.
Yuan Tao, Cai Yangchuan, Luo Zhen, et al.Effect of Al₂O₃ composite ceramic reinforcement on wear behavior of laser cladding Ni-based alloys coatings[J]. Journal of Shanghai Jiaotong University, 2016, 50(10): 1635-1639.
[3] 唐友亮, 蔡维平, 张锦. 镍基复合材料涂层的激光熔覆制备及表征[J]. 金属热处理, 2017, 42(4): 180-184.
Tang Youliang, Cai Weiping, Zhang Jin.Laser cladding preparation and characterization of Ni based composite coating[J]. Heat Treatment of Metals, 2016, 42(4): 180-184.
[4] Liu K, Li Y J, Wang J, et al.Effect of high dilution on the in situ synthesis of Ni-Zr/Zr-Si(B, C) reinforced composite coating on zirconium alloy substrate by laser cladding[J]. Materials Design, 2015, 87: 66-74.
[5] Nowotny S, Berger L M, Jörg Spatzier.Coatings by laser cladding[C]//Comprehensive Hard Materials. Elsevier, 2014: 507-525.
[6] Riquelme A, Rodrigo P, Dolores Escalera-Rodriguez M, et al. Analysis and optimization of process parameters in Al-SiC_p laser cladding[J]. Optics and Lasers in Engineering, 2016, 78: 165-173.
[7] 雷靖峰, 祁文军, 谢亚东, 等. U71Mn钢表面激光熔覆Ni60-25%WC涂层工艺参数优化的研究[J]. 表面技术, 2018, 47(3): 66-71.
Lei Jingfeng, Qi Wenjun, Xie Yadong, et al.Optimization of process parameters of laser cladding Ni60-25% WC coating on U71Mn steel[J]. Surface Technology, 2018, 47(3): 66-71.
[8] 丁阳喜, 王炳. Cr12MoV模具钢表面激光熔覆Ni/WC合金工艺研究[J]. 现代制造工程, 2011(5): 97-100.
Ding Yangxi, Wang Bing.Research on technology of laser cladding Ni/WC on Cr12MoV mould steel surface[J]. Modern Manufacturing Engineering, 2011(5): 97-100.
[9] 白兆军, 孙有平, 涂耀耀, 等. 单道激光熔覆Ni基合金涂层的组织与性能研究[J]. 广西工学院学报, 2013, 24(3): 10-13.
Bai Zhaojun, Sun Youping, Tu Yaoyao, et al.Microstructure and property of single track laser cladding Ni-based alloy[J]. Journal of Guangxi University of Technology, 2013, 24(3): 10-13.
[10] 李国凯, 张培磊, 卢云龙, 等. 激光熔覆Ni-W-Si涂层的组织与性能[J]. 特种铸造及有色合金, 2015, 35(3): 307-310.
Li Guokai, Zhang Peilei, Lu Yunlong, et al.Microstructure and properties of Ni-W-Si composite coating by laser cladding[J]. Special Casting and Nonferrous Alloys, 2015, 35(3): 307-310.
[11] 张华健, 孙中刚, 李峰, 等. 激光熔覆铁基复合涂层组织与性能影响[J]. 表面技术, 2018, 47(12): 127-133.
Zhang Huajian, Sun Zhonggang, Li Feng, et al.Effect of microstructure and properties of laser cladding iron-based composite coatings[J]. Surface Technology, 2018, 47(12): 127-133.
[12] 叶宏, 喻文新, 雷临萍, 等. H13钢表面激光熔覆Ni基涂层的组织与耐磨性能[J]. 特种铸造及有色合金, 2016, 36(7): 690-693.
Ye Hong, Yu Wenxin, Lei Linping, et al.Microstructure and wear resistance of Ni-based coating by laser cladding on H13 steel surface[J]. Special Casting and Nonferrous Alloys, 2016, 36(7): 690-693.
[13] 喻杰, 夏如艇, 吴建波, 等. 7CrSiMnMoV 钢表面激光熔覆Ni/WC性能研究[J]. 热加工工艺, 2015, 44(20): 98-100.
Yu Jie, Xia Ruting, Wu Jianbo, et al.Properties research of Ni/WC prepared on 7CrSiMnMoV steel surface by laser cladding[J]. Journal of Thermal Processing, 2015, 44(20): 98-100.
[14] 邱星武, 李刚, 任鑫, 等. 扫描速度对激光熔覆Ni基涂层组织性能的影响[J]. 稀有金属材料与工程, 2009, 38(S1): 325-328.
Qiu Xingwu, Li Gang, Ren Xin, et al.Influence of scanning speed on microstructure and properties of Ni based laser cladding coatings[J]. Rare Metal Materials and Engineering, 2009, 38(S1): 325-328.
[15] 杨晓红, 杭文先, 秦绍刚, 等. H13钢激光熔覆钴基复合涂层的组织及耐磨性[J]. 吉林大学学报: 工学版, 2017, 47(3): 891-899.
Yang Xiaohong, Hang Wenxian, Qin Shaogang, et al.Microstructure and wear properties of Co-besed composite coatings on H13 steel surface by laser cladding[J]. Journal of Jilin University: Engineering Edition, 2017, 47(3): 891-899.
[16] 叶寒, 朱小刚, 余廷, 等. Mn13Cr2 表面激光熔覆Ni60A/WC涂层研究[J]. 激光与红外, 2018, 48(9): 1099-1103.
Ye Han, Zhu Xiaogang, Yu Ting, et al.Study on laser cladding Ni60A/WC coating on Mn13Cr2 surface[J]. Laser and Infrared, 2018, 48(9): 1099-1103.
[17] Wang X L, Sun W L, Chen Y, et al.Research on trajectory planning of complex curved surface parts by laser cladding remanufacturing[J]. International Journal of Advanced Manufacturing Technology, 2018, 96(5-8): 2397-2406.
[18] 戴正阳. 45钢表面Ni-W-Si激光熔覆耐磨涂层组织与性能研究[J]. 铸造技术, 2018, 39(8): 1836-1852.
Dai Zhengyang.Microstructure and properties laser cladding wear resistance coating on the surface of 45 steel[J]. Founding Technology, 2018, 39(8): 1836-1852.
[19] 王开明, 雷永平, 魏世忠, 等. WC含量对激光熔覆Ni基WC复合涂层组织和性能的影响[J]. 材料热处理学报, 2016, 37(7): 172-179.
Wang Kaiming, Lei Yongping, Wei Shizhong, et al.Effect of WC content on microstructure and properties of laser cladding Ni-based WC composite coating[J]. Transactions of Materials and Heat Treatment, 2016, 37(7): 172-179.
[20] 何斌锋, 付福兴, 谢燕翔, 等. 2Cr13不锈钢激光熔覆涂层的性能[J]. 热加工工艺, 2018, 47(12): 108-111.
He Binfeng, Fu Fuxing, Xie Yanxiang, et al.Performance of 2Cr13 stainless steel laser cladding coating[J]. Hot Working Technology, 2018, 47(12): 108-111.