Experimental Study On Hot Erosion Of Turbine Blade

Gas turbine is the main power plant use dusty gas of high temperature and high pressure produced during the industrial processes. Not only does not require any fuel but also can effectively bring down nitrogen oxide emissions, so it is widely used. High temperature dust gas will erode the surface of turbine blade, not only aerodynamics characteristics of the destruction(cause of affection to the blade profile) but also jeopardizes the strength of the safety blade. Therefore, erosion tests carried out on the blade material at a variety of temperature and angle of attack are very necessary.In this paper, erosion tests carried out on three different blade materials(1Cr12Mo、X20Cr13、2Cr12Ni Mo1W1V), C1 coating and different surface treatment processes(6 min and 12 min steel peening) at different angle of attack. Test temperature is 200 degrees to 600 degrees. Experimental results showed that: Accumulate mass loss of materials studied all linearly vary according to the particle quality; 15°~ 25°, the erosion rate is the highest; 90 °angle of attack shows the lowest erosion rate; Experimental base material erosion rate increases with experimental temperature increase after the first drop. Each material has its own optimal temperature of erosion rate, at this temperature the erosion rate is lowest;The erosion rate of material 2Cr12 Ni Mo1W1V is higher than the other two materials at 200 ℃ and 300 ℃, but is lower than the other two materials at 400 ℃. After steel peening, material 1Cr12 Mo erosion rate increased and resistance decreased. C1 coating erosion rate decreases with experimental temperature increase after the first increase. It has a good anti-erosion characteristic under high temperature conditions.By scanning electron microscope(SEM) for the paper, microscopic mechanism of erosion specimen found under the condition of small angle of attack(10°~ 40°) erosion morphology mainly cutting, plowing, chipping;big angle of attack(10°~ 40°) erosion morphology mainly Chiseling, dent; Looking for the reason of erosion rate decreases with temperature rise from the microscopic view; Steel peening make the material surface a lot of pit and plastic decrease is not conducive to improve the erosion resistance; The impact of particles at high temperatures makes the material C1 coating surface covered with oxide grains, increase resistance to erosion. This article also through research the relationship between the blade surface elastic properties and the erosion distribution, in order to explore the controllable of erosion, put forward a method of researching the controllable of blade erosion based on elastic recovery coefficient.