Properties of laser clad AlCoCrFeNiWx high entropy alloy coatings on H13 steel

doi:10.13251/j.issn.0254-6051.2021.11.043

Abstract

Abstract: Hot working die steel H13 was used as the matrix, and AlCoCrFeNiW_x (x=0, 0.5) high-entropy alloy coatings were prepared by laser cladding, and the influence of W element addition on its structure, thermal stability and wear resistance was researched. The phase structure of the laser clad AlCoCrFeNiW_x high-entropy alloy coatings changes with the addition of W element. The addition of W element will promote the formation of the BCC phase, and the second phase rich in W forms at the grain boundary. The growth direction forms elongated dendrites along the cooling direction, and these second phases play a role of wear-resistant and reinforcing the coatings. The tempering stability of the high-entropy alloy coatings was studied after long-term heat preservation at 800 ℃. The results show that the AlCoCrFeNiW_x high-entropy alloy coatings can maintain high hardness and wear resistance, and the hardness after 14 h heat preservation is still above 400 HV0.2, the coating added with W element has stronger resistance to tempering and softening, and the friction and wear resistance is more than twice that of the substrate after heat preservation at 800 ℃ for 14 h.

Key words: H13 steel, high-entropy alloy coatings(HEACs), laser cladding

CLC Number:

TG139

Wu Tao, Wu Mengting, Chen Yunxiang, Hua Qianfeng, Shi Shuqin, Li Jiheng, Mao Pengzhan, Chen Xiaoming. Properties of laser clad AlCoCrFeNiW_x high entropy alloy coatings on H13 steel[J]. Heat Treatment of Metals, 2021, 46(11): 241-244.

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Properties of laser clad AlCoCrFeNiW_x high entropy alloy coatings on H13 steel

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