A kind of powder used in low-alloy steel for laser additive manufacturing and its preparation method
A low-alloy steel and laser additive technology, which is applied in the direction of additive manufacturing, additive processing, metal processing equipment, etc., can solve the problems of high cost, long production cycle of nuclear power emergency diesel generator camshaft, complex process, etc., and achieve improvement Comprehensive performance, good engineering application prospects and economic benefits, good comprehensive performance
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Embodiment 1
[0040] The composition weight percent (wt%) of the powder is C: 0.05, Cr: 1.40, Ni: 1.80, B: 0.50, Si: 1.00, Mo: 0.50, Mn: 0.10, V: 0.50, and the rest is Fe. The particle size of the powder is 53~140 microns.
[0041] The manufacturing method steps are as follows:
[0042] 1) The low-alloy steel raw materials with the above components are vacuum smelted, gas atomized and sieved to obtain spherical powder; the happy ball rate is ≤2%, the oxygen content is ≤250 ppm, and the impurity content is 3 .
[0043] 2) Dry the powder obtained in step 1 in an oven at 80-120°C for more than 3 hours.
[0044] Such as figure 1 From the SEM morphology of the powder shown, it can be seen that the powder particles are spherical and have a small particle size distribution. Tests showed that the powder had an oxygen content of 216 ppm.
Embodiment 2
[0046] The composition weight percent (wt%) of the alloy powder is C: 0.10, Cr: 1.50, Ni: 1.90, B: 0.60, Si: 1.10, Mo: 0.55, Mn: 0.20, V: 0.50, and the rest is Fe. The particle size of the powder is 53~140 microns.
[0047] The manufacturing method steps are as follows:
[0048] 1) The low-alloy steel raw materials with the above components are vacuum smelted, gas atomized and sieved to obtain spherical powder; the happy ball rate is ≤2%, the oxygen content is ≤250 ppm, and the impurity content is 3 .
[0049] 2) Dry the powder obtained in step 1 in an oven at 80-120°C for more than 3 hours.
[0050] Such as figure 2 Shown is the SEM morphology of the powder ingredients listed in Example 2. It can be seen that the powder particles are spherical and have a small particle size distribution, about 53-140 microns. Tests showed that the powder had an oxygen content of 230 ppm.
Embodiment 3
[0052] The composition weight percent (wt%) of the alloy powder is C: 0.18, Cr: 1.60, Ni: 2.00, B: 0.80, Si: 1.20, Mo: 0.55, Mn: 0.40, V: 0.60, and the rest is Fe. The particle size of the powder is 53~140 microns.
[0053] The manufacturing method steps are as follows:
[0054] 1) The low-alloy steel raw materials with the above components are subjected to vacuum smelting, gas atomization and sieving processes to obtain spherical powder; the happy ball rate is ≤2%, the oxygen content is ≤250 ppm, and the impurity content is 3 .
[0055] 2) Dry the powder obtained in step 1 in an oven at 80-120°C for more than 3 hours.
[0056] Such as image 3 Shown is the powder SEM morphology of the ingredients listed in Example 3. It can be seen that the powder particles are spherical and have a small particle size distribution, about 53-140 microns. Tests showed that the powder had an oxygen content of 240 ppm.
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