锁紧销表面激光熔覆铁基和镍基合金的组织与性能

doi:10.13251/j.issn.0254-6051.2024.06.026

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 159-163.DOI: 10.13251/j.issn.0254-6051.2024.06.026

锁紧销表面激光熔覆铁基和镍基合金的组织与性能

乔青峰¹, 姚小春², 张志坚², 魏家麒¹

1.中车青岛四方机车车辆股份有限公司, 山东青岛 266111;
2.陕西天元智能再制造股份有限公司, 陕西西安 710049

收稿日期:2023-03-01 修回日期:2024-04-18 出版日期:2024-06-25 发布日期:2024-07-29
通讯作者: 姚小春,硕士,E-mail:1286185544@qq.com
作者简介:乔青峰(1978—),男,正高级工程师,主要研究方向为铁道车辆转向架和制动研发,E-mail:sf-qiaoqingfeng@cqsf.com。

Microstructure and properties of laser cladding iron-based and nickel-based alloys on surface of locking pin

Qiao Qingfeng¹, Yao Xiaochun², Zhang Zhijian², Wei Jiaqi¹

1. CRRC Qingdao Sifang Co., Ltd., Qingdao Shandong 266111, China;
2. Shanxi Tianyuan Intelligent Remanufacturing Co., Ltd., Xi'an Shaanxi 710049, China

Received:2023-03-01 Revised:2024-04-18 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 针对锁紧销A面易腐蚀、B面易磨损问题,通过在35CrMo钢锁紧销A面和B面分别激光熔覆镍基合金和铁基合金制备熔覆层,研究其微观组织、显微硬度、强度、耐腐蚀性和耐磨性。结果表明,熔覆层与基体之间形成良好的冶金结合,铁基合金熔覆层与基体的剪切强度达到573 MPa以上,两种熔覆层显微组织以树枝晶、柱状晶及等轴晶组成。铁基合金熔覆层的显微硬度为480 HV0.5左右,基体的硬度为280 HV0.5,激光熔覆铁基合金显著提高锁紧销B面的硬度,其耐磨性较基体大幅提高,可减小硬度太高划伤钢轨的风险;镍基合金熔覆层显微硬度与基体相近。铁基和镍基合金熔覆层经240 h中性盐雾试验均未发现腐蚀现象。

关键词: 锁紧销, 显微组织, 硬度, 剪切强度, 耐磨性, 耐蚀性

Abstract: In view of the problem that the side A of locking pin was easy to corrode and the side B was easy to wear in engineering applications, cladding layers of nickel-based alloy and iron-based alloy were prepared by laser cladding on side A and side B of the 35CrMo steel locking pin respectively, and the microstructure, microhardness, strength, corrosion resistance and wear resistance of the two cladding layers were studied. The results indicate that metallurgical bonding can be achieved between the cladding layers and steel substrate, and the shear strength of the iron-based cladding layer and the substrate can reach above 573 MPa. The microstructure of the two cladding layers is composed of dendrites, columnar and equiaxed grains. The microhardness of the iron-based cladding layer is about 480 HV0.5, and the microhardness of the substrate is 280 HV0.5, so the laser cladding of iron-based alloy significantly increases the hardness of the side B of the lock pin, and its wear resistance is significantly higher than that of the substrate, which can reduce the risk of scratching the rail with too high hardness. The microhardness of the nickel-based alloy cladding layer is similar to that of the substrate. Both the iron-based and nickel-based alloy cladding layers show no corrosion after 240 h neutral salt spray test.

Key words: locking pin, microstructure, microhardness, shear strength, wear resistance, corrosion resistance

中图分类号:

TG156

乔青峰, 姚小春, 张志坚, 魏家麒. 锁紧销表面激光熔覆铁基和镍基合金的组织与性能[J]. 金属热处理, 2024, 49(6): 159-163.

Qiao Qingfeng, Yao Xiaochun, Zhang Zhijian, Wei Jiaqi. Microstructure and properties of laser cladding iron-based and nickel-based alloys on surface of locking pin[J]. Heat Treatment of Metals, 2024, 49(6): 159-163.

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锁紧销表面激光熔覆铁基和镍基合金的组织与性能

Microstructure and properties of laser cladding iron-based and nickel-based alloys on surface of locking pin

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