High Wear-Resistant Aluminum Matrix Composite Layer Fabricated by MIG Welding with Lateral B 4 C Powder Injection
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JMEPEG https://doi.org/10.1007/s11665-018-3672-4
High Wear-Resistant Aluminum Matrix Composite Layer Fabricated by MIG Welding with Lateral B4C Powder Injection Jianxin Sun, Ping Shen, and Daxin Zeng (Submitted January 15, 2018; in revised form July 18, 2018) In this work, a low-cost technique combining MIG welding and lateral powder injection was developed to fabricate B4C particles-reinforced aluminum matrix composite (AMC) layer on a T6 heat-treated 7075 aluminum alloy (AA7075-T6) substrate. The AMC layer was 6-7 mm thick and well bonded to the substrate. The B4C particles were dispersed throughout the AMC layer with an average content of approximately 7 vol.%. No significant reaction products existed either at the particle–matrix interface or in the Almatrix. In pin-on-disk dry sliding wear tests against Al2O3 grinding wheels, the AMC layer exhibited excellent wear resistance with volume wear rate approximately 1/10-3/10 that of the quenched AISI 1045 steel and only approximately 2-7% that of the AA7075-T6 alloy under the same wear conditions. A small addition of ceramic particles can greatly improve wear resistance, suggesting that this technique has good prospects for a wide variety of applications. Keywords
aluminum matrix composite, B4C particle, MIG, powder injection, surface, wear
1. Introduction Aluminum alloys are used in the drilling industry to address limitations in weight capacity of drilling rigs to achieve larger drilling depths due to their low mass, high strength-to-weight ratio and good toughness and ductility (Ref 1, 2). However, their low wear resistance under severe conditions has become a fatal shortcoming. To produce novel components with properties including excellent surface wear resistance and maintaining high strength and toughness, one proposal is to fabricate several millimeters thick wear-resistant composite layers on the surfaces of high-strength aluminum alloys (Ref 3). Among various reinforcers, B4C is an attractive material because of its good chemical and thermal stability, as well as its lower density and higher hardness compared to Al2O3 and SiC (Ref 4, 5). If an AMC layer reinforced with B4C particles can be fabricated on the surface of an aluminum alloy substrate, the wear resistance of the components is expected to improve. Jianxin Sun, Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, PeopleÕs Republic of China; and School of Materials Science and Engineering, Hubei University of Automotive Technology, No. 167 Checheng West Road, Shiyan 442002, PeopleÕs Republic of China; Ping Shen, Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, PeopleÕs Republic of China; and Daxin Zeng, School of Materials Science and Engineering, Hubei University of Automotive Technology, No. 167 Checheng West Road, Shiyan 442002, PeopleÕs Republic of China. Contac
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