Influence of Processing Parameter on Microstructure and Forming Characterizations of Ni-Cr Cladding Formed by Plasma Surfacing Processes

BI Xiao-qin; HU Xiao-li; WANG Jie

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Journal of Aeronautical Materials ›› 2009, Vol. 29 ›› Issue (3) : 45-49.

Influence of Processing Parameter on Microstructure and Forming Characterizations of Ni-Cr Cladding Formed by Plasma Surfacing Processes

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Abstract

The Ni-Cr cladding was coated on the 40Cr alloy by the PTA(plasma Transferred arc) surfacing process.The influence of processing parameter on the microstructure and forming characterizations of the cladding were analyzed.The results indicate that the cladding is well bonded with the matrix and the interface consists of the regular dentritic crystal.The microstructures vary from the thick dentritic crystal in the middle of the cladding to fine equiaxed crystal near the top of the cladding.With the increase of power,the crystals of the cladding are fined under the same scan velocity.The ill-bonding occur in the interface under the lower power and the higher scan velocity,and the crack will appear in the cladding under the higher power and the lower scan velocity.The content of Ni and Cr come into changing evidently in the interface.The cladding with the lower ratio of dilution is acquired under the condition of 2.0kW and 12.0mm/s in this paper.

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plasma arc / Ni-Cr / microstructures / processing parameter

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BI Xiao-qin, HU Xiao-li, WANG Jie. Influence of Processing Parameter on Microstructure and Forming Characterizations of Ni-Cr Cladding Formed by Plasma Surfacing Processes[J]. Journal of Aeronautical Materials, 2009, 29(3): 45-49

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