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

doi:10.13251/j.issn.0254-6051.2024.06.026

Abstract

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

CLC Number:

TG156

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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