A method for preparing powder high-speed steel by multi-atmosphere assisted sintering
An auxiliary sintering and high-speed steel technology, which is applied in the field of powder high-speed steel preparation, can solve the problems of insufficient mechanical properties, high sintering temperature, narrow sintering window, etc., and achieve excellent mechanical properties, improve mechanical properties, and promote liquid phase flow.
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Embodiment 1
[0029] Step 1, the master alloy powder and additives are placed in a V-shaped mixer and mixed evenly. Among them, the master alloy powder is common M3:2 high-speed steel powder on the market, and the additives are carbon powder and zinc stearate. The dosage relative to the total amount of the master alloy is: carbon powder 0.1wt.% and zinc stearate 0.6wt .%.
[0030] In step 2, the mixed powder is molded and preformed using a press with a pressure of 600MPa.
[0031] Step 3, first sinter the pressed sample at 1000°C for 60 minutes in a vacuum atmosphere of 1 Pa, heat the compact to 1070°C and pass in 1 bar of nitrogen (to promote the in-situ formation of nitride strengthening phase), and then the compact Heat to 1150°C and hold for 60 minutes, then raise the temperature to 1230°C, feed a certain amount of argon and hold for 30 minutes, keep the pressure in the furnace at 5MPa, and finally release the pressure and cool to room temperature with the furnace. After testing, the ...
Embodiment 2
[0035] Step 1, the master alloy powder and additives are placed in a V-shaped mixer and mixed evenly. The master alloy powder is the common M3:2 high-speed steel powder on the market, and the additives are carbon powder and zinc stearate, and the amounts thereof are respectively: 0.4wt% of carbon powder and 1wt% of zinc stearate relative to the total amount of the master alloy.
[0036] In step 2, the mixed powder is molded and preformed using a press with a pressure of 800MPa.
[0037] Step 3, put the pressed sample in 10 -2 Sintering under Pa vacuum atmosphere, when the compact is heated to the temperature at which the liquid phase begins to form, 0.2 bar of nitrogen is passed (to promote the in-situ formation of the nitride strengthening phase), and then the compact is heated to 1200 ° C and kept for 60 minutes, and then the temperature is raised to 1270°C, feed a certain amount of argon and keep it warm for 30 minutes, keep the pressure in the furnace at 20MPa, and finall...
Embodiment 3
[0041] Step 1, the master alloy powder and additives are placed in a V-shaped mixer and mixed evenly. The master alloy powder is common T15 high-speed steel powder on the market, and the additives are carbon powder and zinc stearate, and the amounts thereof are respectively: 0.4wt% of carbon powder and 0.8wt% of zinc stearate relative to the total amount of the master alloy.
[0042] In step 2, the mixed powder is molded and preformed using a press with a pressure of 800MPa.
[0043] Step 3, put the pressed sample in 10 -1Sintering under Pa vacuum atmosphere, when the compact is heated to the temperature at which the liquid phase begins to form, 0.5 bar of nitrogen is passed (to promote the in-situ formation of the nitride strengthening phase), and then the compact is heated to 1180 ° C and kept for 60 minutes, and then the temperature is raised to At 1250 ° C, a certain amount of argon gas was introduced and kept for 30 minutes to keep the pressure in the furnace at 10 MPa. ...
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Abstract
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