Abstract
In order to enhance the high-temperature wear resistance of the nickel-base alloy, the electron beam is used to clad the WC-CoCr composite coating on the Inconel 617 surface. A six-factor and three-level orthogonal experiment is designed using Minitab software with scanning beam current, frequency, high voltage, beam spot diameter, offset sweep amplitude, and scanning speed as variables, and the variance and range of the test results are analyzed. The optimal cladding process parameters were determined according to the influence of various factors on the quality characteristics of the cladding layer. The wear behavior at 200°C, 600°C, and 1000°C and microstructure and phase composition of coating before and after electron beam treatment were tested. The results show that the ion exchange between the coating and the substrate is carried out after electron beam treatment. The WC, CoCr, (Fe, Ni)C6, Fe3W3C phase, and solid solution of α-Co were found in the cladding layer, and the microstructure of the coating is mainly dendrite and eutectic on CoCr substrate. The test of wear behavior at high temperature shows that the wear rate of the coating treated by electron beam at 200°C, 600°C, and 1000°C is 10.14 times, 6 times, and 2.29 times lower than that of the substrate, respectively. Moreover, the furrow and scratches of the cladding layer are less than those of the substrate at high temperature. The wear resistance of the coating was improved.
Highlights
Inconel 617 alloy is a nickel-base superalloy developed in early 1960s as an advanced alloy for high temperature, high strength, oxidation resistance, and corrosion resistance and used in gas turbine engines [1, 2]
The high melting point powder can be cladded on the surface of a low melting point substrate by electron beam cladding to form a metallurgical cladding layer with metallurgical binding characteristics, and the surface hardness, wear resistance, and corrosion resistance of 617 alloy matrix can be significantly improved
The purpose of the experiment is to optimize the parameters of electron beam processing so that the performance of the cladding layer can be improved
Summary
Inconel 617 alloy is a nickel-base superalloy developed in early 1960s as an advanced alloy for high temperature, high strength, oxidation resistance, and corrosion resistance and used in gas turbine engines [1, 2]. The high melting point powder can be cladded on the surface of a low melting point substrate by electron beam cladding to form a metallurgical cladding layer with metallurgical binding characteristics, and the surface hardness, wear resistance, and corrosion resistance of 617 alloy matrix can be significantly improved. It has been favored by researchers in recent years. The orthogonal table is used to arrange scientifically and reasonably, and the software is used to carry on the scientific orthogonal experiment design and the auxiliary data processing so as to improve the optimization efficiency It provides an effective experimental method for optimizing the parameters of electron beam cladding
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