{"title":"Microstructure and Mechanical Properties of Laser Clad18Ni300 Coatings with La2O3 Addition on ZL205A Aluminum Alloy","authors":"Qixiao Xu, Daoyou Zheng, Xiao Chen, Sergey Konovalov, Xizhang Chen","doi":"10.1134/s102745102402037x","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The preparation of Fe-based wear-resistant coating by high-speed laser cladding method can well solve the problem of poor wear resistance of aluminum alloy surface. However, due to the large expansion coefficient difference of Fe and Al, the Fe-based laser cladding layer on the Al surface often has cracks, poor molding morphology, and poor mechanical properties. In this work, La<sub>2</sub>O<sub>3</sub> is added as an additive in order to improve the morphology and mechanical properties of Fe-based laser cladding layer on the surface of Al alloy. High-speed laser cladding technology was used to prepare the coating of 18Ni300 + XLa<sub>2</sub>O<sub>3</sub>(X = 0.5, 1, 1.5, 2 wt %) on ZL205A aluminum alloy. The morphology, microstructure, hardness, wear resistance and heat shock resistance of the cladding layer were studied. The morphology and crack characteristics of the fusion zone were observed by scanning electron microscopy. Under the present test conditions, the addition of La<sub>2</sub>O<sub>3</sub> improved the forming morphology, refined the microstructure of the cladding, and significantly improved the mechanical properties of the cladding. The optimal addition of La<sub>2</sub>O<sub>3</sub> with the best properties was 1.5 wt % which provided: flat cladding surface, absence of internal cracks, refined grain size, improved wear resistance and thermal shock resistance, 47% higher hardness when compared to 18Ni300.</p>","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s102745102402037x","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
The preparation of Fe-based wear-resistant coating by high-speed laser cladding method can well solve the problem of poor wear resistance of aluminum alloy surface. However, due to the large expansion coefficient difference of Fe and Al, the Fe-based laser cladding layer on the Al surface often has cracks, poor molding morphology, and poor mechanical properties. In this work, La2O3 is added as an additive in order to improve the morphology and mechanical properties of Fe-based laser cladding layer on the surface of Al alloy. High-speed laser cladding technology was used to prepare the coating of 18Ni300 + XLa2O3(X = 0.5, 1, 1.5, 2 wt %) on ZL205A aluminum alloy. The morphology, microstructure, hardness, wear resistance and heat shock resistance of the cladding layer were studied. The morphology and crack characteristics of the fusion zone were observed by scanning electron microscopy. Under the present test conditions, the addition of La2O3 improved the forming morphology, refined the microstructure of the cladding, and significantly improved the mechanical properties of the cladding. The optimal addition of La2O3 with the best properties was 1.5 wt % which provided: flat cladding surface, absence of internal cracks, refined grain size, improved wear resistance and thermal shock resistance, 47% higher hardness when compared to 18Ni300.
期刊介绍：
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.
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