Laser cladding technological method and alloy material for laser cladding
A technology of laser cladding and alloy materials, which is applied in the field of laser cladding technology and its alloy materials, journals, end faces of high-temperature and high-pressure valves, and can solve the problems of unsatisfactory mechanical properties, high process control requirements, and laser power. High density and other problems, to achieve good anti-cavitation performance, good process adaptability, simple and easy to operate
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Embodiment 1
[0022] Embodiment 1: An alloy material for laser cladding, the chemical composition (weight percentage) of alloy elements is C: 0.85%; Cr: 35%; Fe: 5%; Si: 0.5%; W: 5.0%; Mo: 1.2%; Ni: 7%; V: 1.5%; Ti: 1.0%; B: 0.5%; Nb: 0.3%; Re: 0.6%; Co: balance.
[0023] The preparation method is as follows:
[0024] 1. Calculate the addition amount of various master alloys such as ferrochrome, ferrovanadium, ferrosilicon, and ferroboron (considering the different burning loss rates of each element when calculating).
[0025] 2. After weighing, bake in an oven at 200°C.
[0026] 3. Add high melting point and magnetic elements first, and then add elements that are easy to burn.
[0027] 4. After melting, remove slag, refine and add rare earth elements.
[0028] 5. Open the water and gas circuit, control the pressure and liquid level.
[0029] 6. Place the preheated middle leakage bag on the nozzle, and pour the alloy liquid in the furnace into the middle leakage bag.
[0030] 7. After ...
Embodiment 2
[0033] An alloy material for laser cladding, the chemical composition (weight percentage) of alloy elements is C: 0.95%, Cr: 42%, Fe: 3%, Si: 1.2%, W: 5.5%, Mo: 1.5% , Ni: 6%, V: 1.8%, Ti: 2.0%, B: 1.2%, Nb: 0.5%, Re: 1.0%, Co: balance.
[0034] The preparation method is the same as in Example 1.
[0035] The hardness of the cladding layer prepared by laser cladding with this ratio of alloy powder is HRC52-57. In addition to being applied to steam turbine blades, it can also be applied to the repair of shaft journals and valve end faces, with the same performance and effect.
Embodiment 3
[0037] A laser cladding process method for substituting steam turbine blade inlaid alloy sheets, comprising the following steps:
[0038] 1. If figure 1 As shown, the back arc of blade 1 (including the original R side) is milled off by 1 mm to form milling groove 2; the back arc side is milled off to 1 / 5 of the thickness, but the total depth does not exceed 1 mm; the forming knife can be used to complete it in one step by CNC milling machine .
[0039] 2. According to the size of the milled part, the robot motion track is compiled, and the overlap rate of cladding programming is 55%.
[0040] 3. Adopt optical fiber or semiconductor laser, select the powder of embodiment 1 and embodiment 2, and its particle size is -140+325 mesh (particles are lower than 140 mesh, higher than 325 mesh, and the particle size is within this range), dispatch The powder amount is 14g / min, and the powder is fed by inert gas; the spot diameter is 5mm, the power is adjusted to 1800W, the laser scann...
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