Hot processing method for improving structure uniformity of GH720Li alloy cake blank forging
A technology of uniform structure and hot working, applied in the field of nickel-based superalloys, can solve the problems of unevenness, unstable performance, coarse grain of turbine disc blank forgings, etc., and achieve the effect of achieving accuracy and improving structure uniformity.
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Embodiment 1
[0029] The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%-0.02%, Cr 15.5%-16.5%, Co 14%-15.5%, Ti 4.75%-5.25%, Al 2.25%-2.75%, Mo 2.75% % to 3.25%, W 1% to 1.5%, Zr 0.025% to 0.05%, and the remainder nickel. Alloy ingots are made by vacuum induction + vacuum self-consumption double vacuum melting, and then homogenized and forged to obtain alloy rods of ASTM 7.0 grade.
[0030] Adopt the steps of the thermal processing method that the present invention improves the structure uniformity of GH720Li alloy cake billet forging is:
[0031] Step 1: Cut and chamfer the GH720Li alloy bar;
[0032] Step 2: Pretreat the alloy billet with a heating furnace, heat the alloy billet to 1050°C, keep it warm for 2.5 hours, then slowly cool it to 700°C at a cooling rate of 20°C / h, and then furnace cool it to room temperature and take it out of the furnace;
[0033] Step 3: Sand blast the surface of the pretreated alloy billet, and evenly apply glass lubricant, hea...
Embodiment 2
[0039] The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%-0.02%, Cr 15.5%-16.5%, Co 14%-15.5%, Ti 4.75%-5.25%, Al 2.25%-2.75%, Mo 2.75% % to 3.25%, W 1% to 1.5%, Zr 0.025% to 0.05%, and the remainder nickel. The alloy ingot is melted by vacuum induction + vacuum self-consumption double vacuum, and then homogenized and forged to get the alloy rod of ASTM 8.0 grade.
[0040] Adopt the steps of the thermal processing method that the present invention improves the structure uniformity of GH720Li alloy cake billet forging is:
[0041] Step 1: Cut and chamfer the GH720Li alloy bar;
[0042] Step 2: Pre-treat the alloy billet in a heating furnace, heat the alloy billet to 1020°C, keep it warm for 3 hours, then slowly cool it to 700°C at a cooling rate of 30°C / h, and then furnace cool it to room temperature and take it out of the furnace;
[0043] Step 3: Sand blast the surface of the pretreated alloy billet, and evenly apply the glass lubricant, then u...
Embodiment 3
[0049] The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%-0.02%, Cr 15.5%-16.5%, Co 14%-15.5%, Ti 4.75%-5.25%, Al 2.25%-2.75%, Mo 2.75% % to 3.25%, W 1% to 1.5%, Zr 0.025% to 0.05%, and the remainder nickel. Alloy ingots are made by vacuum induction + vacuum self-consumption double vacuum melting, and then homogenized and forged to obtain alloy rods of ASTM 9.0 grade.
[0050] Adopt the steps of the thermal processing method that the present invention improves the structure uniformity of GH720Li alloy cake billet forging is:
[0051] Step 1: Cut and chamfer the GH720Li alloy bar;
[0052] Step 2: Pretreat the alloy billet with a heating furnace, heat the alloy billet to 1000°C, keep it warm for 3 hours, and then slowly cool it to 700°C at a cooling rate of 40°C / h, then cool it to room temperature and take it out of the furnace;
[0053] Step 3: Sand blast the surface of the pretreated alloy billet, and evenly apply glass lubricant, then use a he...
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