Effects of solution and ageing treatment on microstructure and properties of WC reinforced 18Ni300 steel substrate composite coatings by plasma transferred arc

HU Yongjun; LUO Junwei; YI Jianglong; YI Yaoyong; NIU Ben

doi:10.12073/j.hjxb.20190918003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(11): 62-68. > DOI: 10.12073/j.hjxb.20190918003

HU Yongjun, LUO Junwei, YI Jianglong, YI Yaoyong, NIU Ben. Effects of solution and ageing treatment on microstructure and properties of WC reinforced 18Ni300 steel substrate composite coatings by plasma transferred arc[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(11): 62-68. DOI: 10.12073/j.hjxb.20190918003

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Effects of solution and ageing treatment on microstructure and properties of WC reinforced 18Ni300 steel substrate composite coatings by plasma transferred arc

1.
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
2.
Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangzhou 510651, China

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Received Date: September 17, 2019
Available Online: October 21, 2020

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Abstract

Abstract

WC-reinforced 18Ni300 steel composite coating was prepared on the surface of Cr5 steel by plasma transferred arc. The influence of adding 25% WC and 35% mass fraction of spherical WC on the microstructure and properties were investigated. The microstructure/phase transformation and properties of the surfacing layer before and after solution treatment (900 °C × 1 h) + aging (490 °C × 5 h) were analyzed and compared. The results show that the addition of WC particles in the maraging steel affects the martensitic transformation in the surfacing structure. The microstructure is mainly austenitic in the WC/MS300 composite surfacing coating. After solution aging heat treatment, the microhardness and wear resistance of WC/MS300 composite surfacing coating were significantly improved, and the microstructure transformed from γ-Fe to α-Fe in the sample, 35%WC coating presented best wear resistance. However, the microhardness and friction and wear properties of the substrate samples decreased. The microstructure evolution of WC indicates that a thick diffusion layer is formed around the WC particles after solution aging heat treatment, which significantly improves the interfacial bonding.
- solution aging,
- plasma transferred arc (PTA),
- composite coating,
- microhardness,
- wear resistance

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Effects of solution and ageing treatment on microstructure and properties of WC reinforced 18Ni300 steel substrate composite coatings by plasma transferred arc

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