Microstructure and Mechanical Properties of Fe-Based Alloy Coatings Fabricated by Laser Cladding

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science-medziagotyra Pub Date : 2023-09-01 DOI:10.5755/j02.ms.33919

Lu XIE, Yueming WANG

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Abstract

The Fe-based alloy coating was prepared on the surface of 25Cr2Ni4MoV steel substrate by laser cladding. The microstructure, microhardness, shear strength, friction and wear properties of the laser cladding coating were systematically studied. The results show that a good metallurgical bond has been formed between Fe-based alloy coating and substrate. The laser cladding layer is a typical dendritic crystal, which is composed of light gray and dark gray phases. The shear strength displacement curve shows the typical characteristics of brittle fracture, with an average shear strength of 280.83 MPa. The average dry friction coefficient, wear track depth and average wear volume of laser cladding Fe-based alloy coatings are (0.45 ± 0.01), (26 ± 3) μm and 0.066615 m3, respectively. The average dry friction coefficient, wear track depth and average wear volume of 25Cr2Ni4MoV substrate are (0.60 ± 0.01), (39 ± 3) μm and 0.13085 m3, respectively. The laser cladded Fe-based alloy coating exhibits much better wear resistance than the steel substrate, and the shear strength of the coating displays its potential for the application in the service environment of shear stress.

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激光熔覆制备铁基合金涂层的组织与力学性能

采用激光熔覆的方法在25Cr2Ni4MoV钢基体表面制备了铁基合金涂层。系统地研究了激光熔覆层的显微组织、显微硬度、抗剪强度、摩擦磨损性能。结果表明，铁基合金涂层与基体之间形成了良好的冶金结合。激光熔覆层为典型的枝晶，由浅灰色相和深灰色相组成。抗剪强度位移曲线表现为典型的脆性断裂特征，平均抗剪强度为280.83 MPa。激光熔覆铁基合金涂层的平均干摩擦系数为(0.45±0.01)μm，平均磨损轨迹深度为(26±3)μm，平均磨损体积为0.066615 m3。25Cr2Ni4MoV基板的平均干摩擦系数为(0.60±0.01)μm，磨损轨迹深度为(39±3)μm，平均磨损体积为0.13085 m3。激光熔覆铁基合金涂层的耐磨性明显优于钢基体，涂层的抗剪强度显示出其在剪切应力工况下的应用潜力。

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来源期刊

Materials Science-medziagotyra 工程技术-材料科学：综合

CiteScore

1.70

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： It covers the fields of materials science concerning with the traditional engineering materials as well as advanced materials and technologies aiming at the implementation and industry applications. The variety of materials under consideration, contributes to the cooperation of scientists working in applied physics, chemistry, materials science and different fields of engineering.