There is provided a method of manufacturing an Ni-base superalloy which enables a uniform coat of a glass lubricant to be maintained even after heated to hot forging temperature. The method of manufacturing an Ni-base superalloy in which a forging stock containing an Ni-base superalloy, coated with
There is provided a method of manufacturing an Ni-base superalloy which enables a uniform coat of a glass lubricant to be maintained even after heated to hot forging temperature. The method of manufacturing an Ni-base superalloy in which a forging stock containing an Ni-base superalloy, coated with a lubricant, is subjected to hot forging includes: a preliminary oxidation step of previously generating a Cr oxide coating film having a film thickness of 0.5 to 50 μm on the forging stock thereby to obtain a preliminarily oxidized material; a lubricant coating step of coating the preliminarily oxidized material with a glass lubricant containing borosilicate glass as a main component thereby to obtain a material to be forged; and a hot forging step of hot forging the material to be forged thereby to obtain a hot forged material.
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1. A method of manufacturing an Ni-base superalloy, in which a forging stock including an Ni-base superalloy, coated with a lubricant, is subjected to hot forging, comprising: a preliminary oxidation step of previously generating a Cr oxide coating film having a film thickness of 0.5 to 50 μm on the
1. A method of manufacturing an Ni-base superalloy, in which a forging stock including an Ni-base superalloy, coated with a lubricant, is subjected to hot forging, comprising: a preliminary oxidation step of previously generating a Cr oxide coating film having a film thickness of 0.5 to 50 μm on the forging stock;a lubricant coating step of coating a Cr oxide coating film formed on the forging stock having been subjected to the preliminary oxidation step with a glass lubricant including borosilicate glass as a main component; anda hot forging step of hot forging the forging stock having been subjected to the lubricant coating step. 2. The method of manufacturing an Ni-base superalloy according to claim 1, wherein a thickness of the glass lubricant applied in the lubricant coating step is 100 to 600 μm. 3. The method of manufacturing an Ni-base superalloy according to claim 1, wherein a heating temperature in the preliminary oxidation step is 900° C. to a hot forging temperature. 4. The method of manufacturing an Ni-base superalloy according to claim 1, wherein the Ni-base superalloy contains, in terms of mass %, 0.08% or less of C, 0.35% or less of Si, 0.35% or less of Mn, 0.015% or less of P, 0.015% or less of S, 50.0 to 55.0% of Ni, 17.0 to 21.0% of Cr, 2.8 to 3.3% of Mo, 1.0% or less of Co, 0.30% or less of Cu, 0.20 to 0.80% of Al, 0.65 to 1.15% of Ti, 4.75 to 5.50% of Nb+Ta, 0.006% or less of B, and a remainder of Fe and unavoidable impurities. 5. The method of manufacturing an Ni-base superalloy according to claim 1, wherein the hot forging step is closed die forging using a die heated to a temperature of 400° C. or higher. 6. The method of manufacturing an Ni-base superalloy according to claim 5, wherein a heating temperature in the preliminary oxidation step is 900° C. to a hot forging temperature. 7. The method of manufacturing an Ni-base superalloy according to claim 5, wherein a thickness of the glass lubricant applied in the lubricant coating step is 100 to 600 μm. 8. The method of manufacturing an Ni-base superalloy according to claim 5, wherein in the hot forging step the forging stock heated to a temperature of 900 to 1100° C. is subjected to hot forging. 9. The method of manufacturing an Ni-base superalloy according to claim 8, wherein a heating temperature in the preliminary oxidation step is 900° C. to a hot forging temperature. 10. The method of manufacturing an Ni-base superalloy according to claim 8, wherein the Ni-base superalloy contains, in terms of mass %, 0.08% or less of C, 0.35% or less of Si, 0.35% or less of Mn, 0.015% or less of P, 0.015% or less of S, 50.0 to 55.0% of Ni, 17.0 to 21.0% of Cr, 2.8 to 3.3% of Mo, 1.0% or less of Co, 0.30% or less of Cu, 0.20 to 0.80% of Al, 0.65 to 1.15% of Ti, 4.75 to 5.50% of Nb+Ta, 0.006% or less of B, and a remainder of Fe and unavoidable impurities. 11. The method of manufacturing an Ni-base superalloy according to claim 5, wherein the Ni-base superalloy contains, in terms of mass %, 0.08% or less of C, 0.35% or less of Si, 0.35% or less of Mn, 0.015% or less of P, 0.015% or less of S, 50.0 to 55.0% of Ni, 17.0 to 21.0% of Cr, 2.8 to 3.3% of Mo, 1.0% or less of Co, 0.30% or less of Cu, 0.20 to 0.80% of Al, 0.65 to 1.15% of Ti, 4.75 to 5.50% of Nb+Ta, 0.006% or less of B, and a remainder of Fe and unavoidable impurities. 12. The method of manufacturing an Ni-base superalloy according to claim 1, wherein in the hot forging step the forging stock heated to a temperature of 900 to 1100° C. is subjected to hot forging. 13. The method of manufacturing an Ni-base superalloy according to claim 12, wherein a thickness of the glass lubricant applied in the lubricant coating step is 100 to 600 μm. 14. The method of manufacturing an Ni-base superalloy according to claim 12, wherein a heating temperature in the preliminary oxidation step is 900° C. to a hot forging temperature. 15. The method of manufacturing an Ni-base superalloy according to claim 12, wherein the Ni-base superalloy contains, in terms of mass %, 0.08% or less of C, 0.35% or less of Si, 0.35% or less of Mn, 0.015% or less of P, 0.015% or less of S, 50.0 to 55.0% of Ni, 17.0 to 21.0% of Cr, 2.8 to 3.3% of Mo, 1.0% or less of Co, 0.30% or less of Cu, 0.20 to 0.80% of Al, 0.65 to 1.15% of Ti, 4.75 to 5.50% of Nb+Ta, 0.006% or less of B, and a remainder of Fe and unavoidable impurities.
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이 특허에 인용된 특허 (4)
Spiegelberg William D. (Parma OH), Method of hot die isothermal dwell forging.
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