Cavitation erosion behavior of WC coatings on CrNiMo stainless steel by laser alloying

Xiao-bin Zhang1,2),Chang-sheng Liu1),Xiao-dong Liu1),Jiang Dong1),Bo Yu3) 1) School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China 2) School of Material Science and Engineering,Chongqing Institute of Technology,Chongqing 400050,China 3) Shenyang Research Institute of Foundry,Shenyang 110022,China

摘 要：The WC powder was precoated on the surface of CrNiMo stainless steel and then made into an alloying layer by using the laser alloying technique. Phases in the layers were investigated by X-ray diffraction （XRD） analysis and surface morphologies after cavitation erosion were observed with the help of scanning electron microscopy （SEM）. The cavitation erosion behavior of the CrNiMo stainless steel and WC laser alloying layer in distilled water was tested with the help of ultrasonic vibration cavitation erosion equipment. The results showed that the thickness of the laser alloying layer was about 0.13 mm. The layer had a dense micro-structure,metallurgically bonded to the substrate,and no crack had been found. The cavitation erosion mass loss rate of the laser alloying layer was only 2/5 that of the CrNiMo stainless steel. The layer had better cavitation resistance properties because of its met-allurgical combination and the strengthening effects of the precipitate phases.

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