The Research Of Laser Alloying Processing To Improve The Wear-Resistance Of Stainless Steel Pump Shaft

The wear failure of axes is often occurred in modern industry production. The wear-out failure of stainless steel soap pump shaft, used in monomer installation producing partial dichlorethylene in Juhua Group Co,.Ltd. Electrization Factory, will cause dramatic economic losses and danger. At the same time, the price of the axes is very high, and the troublesome of replacing pump shaft will influence the equipments' running, so it is urgent to lengthen its service life. Based on the mechanism of wear failure on stainless steel axes, this paper studied the interaction of axes and high energy density CO₂ laser. Through optimum designing of alloying material and processing parameter during laser alloying, the hardness and wear-resistance of stainless steel were advanced. There are many facets affecting the quality of laser alloying, but this paper emphasized at some main factors such as the thickness of pre-coated alloy, overlapping coefficient, laser power and scanning rate. The qualitative analysis and quantitative analysis on laser alloying quality were performed by microhardness testing, metallographical observation, energy spectrum analysis, wear contrast test and corrosion-resisting test, and then got the optimum processing parameters of laser alloying, finally reached the aim of greatly advancing the wear-resistance of stainless steel axes. The result showed that after laser alloying on stainless steel, a solid metallurgy bonding was formed between alloying layer and matrix, the surface hardness increased from original HV191 to HV820, and the wear-resistance of axes was advanced over seven times. The field test result showed that the service life of axes after...