Microstructure and erosion wear properties of CrMoV alloying coating

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (10) : 111-114.

ZHAO Jian-hua，ZHAO Zhan-xi，CHEN Xiao-liang，LU Xiao，ZHOU Xiang，JI Xiu-lin

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Abstract

CrMoV surfacing coatings were deposited on the 20 steel substrates using shielded metal arc welding．The microstructure, erosion resistance and erosion mechanism of CrMoV coatings were studied. With the increasing of surfacing layer, dilution rate of parent material decreasing, the microstructure of surfacing layer consisted of martensite, residual austenite and alloy carbides. The highest hardness of the surfacing alloy exists on the second, third layer. The average micro-hardness of the surfacing layers is 780HV, which is more than 4 times of the matrix one. The erosion wear tests show that the CrMoV coating obviously has better erosion resistance than the substrate. The erosion wear mechanism of CrMoV coating is mainly micro-cutting at small impact angle and mainly fatigue damage, local plastic deformation at large impact angle. The erosion rate of surface coating increased with the increasing particle size, but was not directly proportional to the particle size.

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CrMoV surfacing layer / erosion wear / microstructure / impact angle

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ZHAO Jian-hua，ZHAO Zhan-xi，CHEN Xiao-liang，LU Xiao，ZHOU Xiang，JI Xiu-lin. Microstructure and erosion wear properties of CrMoV alloying coating[J]. Journal of Vibration and Shock, 2015, 34(10): 111-114

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