Laser composite manufacturing method for prolonging sealing service life of hard surface of valve
A technology of service life and manufacturing method, applied in the direction of coating, metal material coating process, etc., can solve the problems of easy cracking of the cladding layer, reduce the quality of the cladding layer, and high alloy hardness, so as to reduce the risk of cracking, resist the Good high temperature oxidation and good wear resistance
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Embodiment 1
[0036] (1) Machining the valve seat or valve core to be processed according to the drawing information, put it into a resistance furnace for preheating treatment before welding, the preheating temperature is 280 ° C, and keep it warm for 4 hours, based on the size and thickness of the valve seat and valve core , subject to the fact that the surface of the valve seat and the valve core are consistent with the internal temperature;
[0037] (2) The laser cladding process is adopted, equipped with cobalt-based alloy powder, and a metallurgically bonded 0.8 mm thick cobalt-based cladding layer is formed on the surface of the forged alloy P91 material. The technical parameters of the laser cladding process are: 1 layer, power 1900W, spot diameter 5.0mm, welding speed 500 mm / min, lap rate 50%, powder feeding rate 24 g / mim; cobalt-based alloy is composed of the following components in terms of mass fraction, carbon 0.40%, chromium 25.5%, 1.0% iron, 0.5% manganese, 1.0% molybdenum, 10...
Embodiment 2
[0041] (1) Machining the valve seat or valve core to be processed according to the drawing information, put it into a resistance furnace for preheating treatment before welding, the preheating temperature is 300°C, and keep it warm for 3 hours, based on the size and thickness of the valve seat and valve core , subject to the fact that the surface of the valve seat and the valve core are consistent with the internal temperature;
[0042](2) The laser cladding process is adopted, equipped with cobalt-based alloy powder, and a metallurgically bonded 1.8mm thick cobalt-based cladding layer is formed on the surface of the forged alloy P91 material. The technical parameters of the laser cladding process are: 2 layers, power 1750W, spot diameter 5.0mm, welding speed 500 mm / min, lap rate 50%, powder feeding volume 22g / mim; cobalt-based alloy is composed of the following components in terms of mass fraction, carbon 0.3%, chromium 27%, iron 0.8%, manganese 0.6%, molybdenum 0.7%, nickel ...
Embodiment 3
[0046] (1) Machining the valve seat or valve core to be processed according to the drawing information, put it into a resistance furnace for preheating treatment before welding, the preheating temperature is 300°C, and keep it warm for 3 hours, based on the size and thickness of the valve seat and valve core , subject to the fact that the surface of the valve seat and the valve core are consistent with the internal temperature;
[0047] (2) The laser cladding process is adopted, equipped with cobalt-based alloy powder, and a metallurgically bonded 1.0 mm thick cobalt-based cladding layer is formed on the surface of the forged alloy P91 material. The technical parameters of the laser cladding process are: 1 layer, power 1900W, spot diameter 5.0mm, welding speed 500 mm / min, lap rate 50%, powder feeding volume 28g / mim; cobalt-based alloy is composed of the following components in terms of mass fraction, carbon 0.5%, chromium 24%, iron 1.3%, manganese 0.4%, molybdenum 1.2%, nickel...
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