Coating and Surface EngineeringNo Access

Characteristics of Ni–Cr–Fe laser clad layers on EA4T steel

School of Materials Science and Engineering, Southwest Jiaotong University, 111 North Second Ring Road, Chengdu, Sichuan 610031, P. R. China

School of Materials Science and Engineering, Xihua University, 999 Jinzhou Road, Jinniu, Chengdu, Sichuan, P. R. China

E-mail Address: njchenwenjing@163.com

Corresponding author.

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Hui Chen

School of Materials Science and Engineering, Southwest Jiaotong University, 111 North Second Ring Road, Chengdu, Sichuan 610031, P. R. China

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Yongjing Wang

School of Materials Science and Engineering, Xihua University, 999 Jinzhou Road, Jinniu, Chengdu, Sichuan, P. R. China

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Congchen Li

School of Materials Science and Engineering, Xihua University, 999 Jinzhou Road, Jinniu, Chengdu, Sichuan, P. R. China

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, and

Xiaoli Wang

School of Materials Science and Engineering, Xihua University, 999 Jinzhou Road, Jinniu, Chengdu, Sichuan, P. R. China

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https://doi.org/10.1142/S0217979217440313Cited by:3 (Source: Crossref)

Abstract

The Ni–Cr–Fe metal powder was deposited on EA4T steel by laser cladding technology. The microstructure and chemical composition of the cladding layer were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The bonding ability between the cladding layer and the matrix was measured. The results showed that the bonding between the cladding layer and the EA4T steel was metallurgical bonding. The microstructure of cladding layer was composed of planar crystals, columnar crystals and dendrite, which consisted of Cr₂Ni₃, $γ$ $γ$ phase, M $_{23}$ $_{23}$ C₆ and Ni₃B phases. When the powder feeding speed reached 4 g/min, the upper bainite occurred in the heat affected zone (HAZ). Moreover, the tensile strength of the joint increased, while the yield strength and the ductility decreased.

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