激光直接沉积Fe55/NiCr-Cr<sub>3</sub>C<sub>2</sub>复合涂层的组织与性能

doi:10.11896/cldb.20050234

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Abstract In this study, the Fe-based composite alloy powders were obtained by mechanically (ball-milling) mixing different amounts of 25%NiCr-75%Cr₃C₂ powders with Fe55 wear-resistant alloy powders. And then, using the prepared composite alloy powders, Fe-based composite coa-tings with different Cr₃C₂ contents were subsequently fabricated on Q235 steel substrates via laser direct deposition. The microstructure and properties of the deposited coatings were analyzed using many experimental means such as OM, SEM, XRD, microhardness test, friction and wear test, high temperature oxidation test and electrochemical workstation, and so on. The results showed that, the composite coatings containing Cr₃C₂ are mainly composed of α-Fe, γ-Fe, Cr₇C₃, (Cr,Fe)₇C₃, Cr₂₃C₆, CrFeB and Cr₃C₂, etc. The coating with 30% Cr₃C₂ exhibits ty-pical radial structures which constitute of long rod-shaped and polygon block (Cr,Fe)₇C₃ radiating from the center of Cr₃C₂ particles to the perip-hery, and the chronological formation sequence of the three carbides in the radial structure is Cr₃C₂→(Cr, Fe)₇C₃→Cr₂₃C₆. Moreover, the addition of Cr₃C₂ can result in the increase of the amount of eutectic structure and the change in morphology, as the coatings with no/with 30% Cr₃C₂ contains about 40.2%/50.6% eutectic structure, and the eutectic structure of the coating with 9% Cr₃C₂ is obviously refined, with a remarkably smaller lamellar spacing. Compared with Fe55 coating, all the composite coatings (with 9%, 15% and 30% Cr₃C₂) got significantly improved in comprehensive mechanical properties such as hardness, wear resistance, high temperature oxidation resistance and corrosion resistance, and the coating with 15% Cr₃C₂ has the best integrative performance. The strengthening method for directly deposited Fe55 alloy coatings by adding Cr₃C₂ proposed in this work is expected to provide new insights for the development of laser-additive manufacturing high-hardness, wear resistant and corrosion resistant working layer of friction parts.

Key words： additive manufacturing Fe55 alloy powder laser direct deposition Cr₃C₂ high temperature oxidation resistance

Published: 04 June 2021

CLC number:

TG174.44

Fund:National Key R&D Program of China (2016YFB1100201), Green Manufacturing System Integration Project of the Industry and Information Ministry of China (2017-53), Research and Development Plan for the Future Emerging Industries in Shenyang (18-004-2-26).

About author:: Guili Yin is a associate professor of Liaoning University of Technology and doctoral candidate of Northeast University. She is mainly engaged in laser additive manufacturing technology and material surface modification.
Suiyuan Chen is a professor and doctoral supervisor at Northeastern University. He is also the deputy director of the department of materials in the school of materials science and engineering. He is also executive vice presidents of the Northeastern University and Anshan laser application technology institute, and the laser application technology institute of Liaoning provincial institutions. His main research direction is laser additive manufacturing technology. He has published more than 150 academic papers in domestic and foreign journals, among which more than 30 papers are SCI indexed and 60 papers are EI indexed. He edited and published a monograph on laser preparation and processing technology of materials, and obtained 16 national authorized invention patents. He has taken charge of over more than 20 national, provincial, municipal and enterprise projects, and participated in 7 projects, including state funds and national defense items. He won the second prize of national metallurgical science and technology progress award, the third and second prizes of Liaoning pro-vince natural science.

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	YIN Guili
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Cite this article:

YIN Guili,CHEN Suiyuan,LIANG Jing, et al. Microstructure and Properties of Fe55/NiCr-Cr₃C₂ Composite Coating Prepared by Laser Direct Deposition[J]. Materials Reports, 2021, 35(10): 10127-10133.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20050234 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10127

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