Forming method of forging of 718 Plus alloy

Abstract

The invention relates to a forming method of an annular forging of 718 Plus alloy, which comprises the following steps: wrapping the cylindrical surface of a blank of the 718 Plus alloy with a first blanket, further heating to 1000-1100 C., then stopping heating, and immediately performing upsetting and punching treatment on the blank; further respectively wrapping the outer surface and the punched inner surface of the blank after treatment with second blankets, further heating to 1000-1060 C., then stopping heating, immediately performing blank holder reaming treatment on the blank; and respectively wrapping the outer surface and the reamed inner surface of the blank after treatment with the second blankets, further heating to 985-1038 C., then stopping heating, and immediately rolling the blank to obtain a final product, after the method is used for treatment, the grain size of the forging achieves level 6 or above, and the surface has no common cracks.

Claims

1. A forming method of an annular forging of 718 Plus alloy, by performing treatment on a cylindrical blank of the 718 Plus alloy and is characterized in that: (I) composing a first blanket (2) by a ceramic fiber with a thickness of 10 mm-15 mm and a high-temperature binder powder which is uniformly scattered on the ceramic fiber in a thickness of 1-2 mm, wherein a melting temperature of the high-temperature binder powder is 850-900 C., wrapping a cylindrical surface of a blank (1) of the 718 Plus alloy with the first blanket (2) enable the first blanket (2) scattered with the high-temperature binder powder to be in close fit with the cylindrical surface of the blank (1), further fixing the first blanket (2) with the cylindrical surface of the blank (1), then heating to 1000-1100 C., then stopping heating, immediately performing upsetting and punching treatment on the blank (1), wherein a punching diameter should not be more than of an outer diameter of the blank (1) after upsetting, and natural cooling the blank (1) to room temperature after the treatment to enable the first blanket (2) wrapped on the blank (1) to peel off; (II) composing second blankets (3) by placing the ceramic fiber with the thickness of 10 mm-15 mm on an iron sheets with a thickness of 1 mm-1.5 mm and uniformly scattering the high-temperature binder powder with the thickness of 1-2 mm on the ceramic fiber, wherein the melting temperature of the high-temperature binder powder is 850-900 C., respectively wrapping an outer surface and a punched inner surface of the blank (1) after treatment in the step (I) with the second blankets (3) to enable the second blankets (3) scattered with the high-temperature binder powder to be in close fit with the outer surface and the punched inner surface of the blank (1) respectively, respectively fixing the second blankets (3) on the outer surface and the punched inner surface of the blank (1), further heating to 1000-1060 C., then stopping heating, immediately performing blank holder reaming on the blank (1), and natural cooling the blank (1) to room temperature after the end of treatment to enable the second blankets (3) wrapped on the blank (1) to peel off; (III) respectively wrapping the outer surface and a reamed inner surface of the blank after treatment in the step (II) with the second blankets (3) to enable the second blankets (3) scattered with the high-temperature binder powder to be in close fit with the outer surface and the reamed inner surface of the blank (1) respectively, respectively fixing the second blankets (3) on the outer surface and the reamed inner surface of the blank (1), further heating to 985-1038 C., then stopping heating, immediately rolling the blank (1) to obtain a final product, and natural cooling the blank (1) to room temperature after the treatment to enable the second blankets (3) wrapped on the blank (1) to peel off; wherein in the step (II) and the step (III), after the second blankets (2) wrapped on the outer surface and the punched or the reamed inner surface of the blank (1) respectively wrap the outer surface and the punched or the reamed inner surface of the blank (1), the second blankets (3) are respectively fixed on the outer surface and the punched or the reamed inner surface of the blank (1) at joints of the iron sheet on two lapped edges of the second blankets (3) by spot welding.

2. The forming method of the annular forging of the 718 Plus alloy according to claim 1, wherein in the step (I), an iron wire with a diameter of 1-3 mm is used for fixing the first blanket (2) and the blank (1) together.

3. The forming method of the annular forging of the 718 Plus alloy according to claim 2, wherein in the step (I), two iron wires with the diameter of 1-3 mm are used for bundling the first blanket (2) and the blank (1) together.

4. The forming method of the annular forging of the 718 Plus alloy according to claim 1, wherein three iron sheet strips (4) with a width of 40-60 mm are used for connecting the second blanket (2) wrapped on the outer surface of the blank (1) and the second blanket (2) wrapped on the punched or the reamed inner surface of the blank (1) together on upper and the lower end surfaces of the blank (1), one end of each iron sheet strip (4) is welded with the iron sheet on the second blanket (2) wrapped on the outer surface of the blank (1) together, and the other end of each iron sheet strip (4) is welded with the iron sheet on the second blanket (2) wrapped on the punched or the reamed inner surface of the blank (1).

5. The forming method of the annular forging of the 718 Plus alloy according to claim 1, wherein the high-temperature binder powder contains 10-14% of Al.sub.2O.sub.3, 45-52% of SiO.sub.2, 12-16% of CaO, 4-8% of Na.sub.2O and 15-22% of B.sub.2O.sub.3.

6. The forming method of the annular forging of the 718 Plus alloy according to claim 1, wherein the 718 Plus alloy contains 0.01-0.05% of C, not more than 0.35% of Mn, not more than 0.035% of Si, 0.004-0.020% of P, not more than 0.025% of S, 17-21% of Cr, 2.5-3.1% of Mo, 5.20-5.80% of Nb, 0.50-1.00% of Ti, 1.2-1.7% of Al, 8.00-10.00% of Co, 8.00-10.00% of Fe, 0.008-1.4% of W, 0.003-0.008% of B and a balance of Ni-containing high-temperature alloy, wherein a sum of the above ingredients is 100%.

7. The forming method of the annular forging of the 718 Plus alloy according to claim 1, wherein the heating is performed in an electric furnace.

8. The forming method of the annular forging of the 718 Plus alloy according to claim 1, characterized in that the ceramic fiber is the ceramic fiber containing 44% of Al.sub.2O.sub.3, 52% of SiO.sub.2, 1% of Fe.sub.2O.sub.3 and a balance of ZrO.sub.2.

Description

DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of flow process of a forming method of a forging of 718 Plus alloy of the invention;

(2) FIG. 2 is a perspective schematic diagram of a blank wrapped by iron sheets and iron sheet strips.

(3) In FIG. 1 and FIG. 2, reference numeral 1: blank; reference numeral 2: first blanket; reference numeral 3: second blanket; and reference numeral 4: iron sheet strip.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(4) The chemical components of 718 Plus alloy (718 Plus) are as follows:

(5) TABLE-US-00001 C Mn Si P S Cr Ni Mo Nb Ti Al Co Fe W B % w/w, min. 0.01 0.004 17.00 BAL 2.50 5.20 0.50 1.20 8.00 8.00 0.000 0.003 % w/w, max. 0.05 0.35 0.035 0.020 0.025 21.00 BAL 3.10 5.80 1.00 1.70 10.00 10.00 1.40 0.008

(6) As shown in FIG. 1, a forming method of an annular forging of 718 Plus alloy of the invention is used for performing treatment on a cylindrical blank of the 718 Plus alloy, and the forming method comprises the following steps:

(7) (I) composing a first blanket (2) by ceramic fiber with the thickness of 10 mm-15 mm and high-temperature binder powder which is uniformly scattered on the ceramic fiber in the thickness of 1-2 mm, wherein the melting temperature of the high-temperature binder powder is 850-900 C., wrapping the cylindrical surface of the blank (1) of the 718 Plus alloy with the first blanket to enable the first blanket (2) scattered with the high-temperature binder powder to be in close fit with the cylindrical surface of the blank (1), further fixing the first blanket (2) with the cylindrical surface of the blank (1), then heating to 1000-1100 C., then stopping heating, immediately performing upsetting and punching treatment on the blank (1), wherein the punching diameter should not be more than of the outer diameter of the blank (1) after upsetting, and naturally cooling the blank (1) to room temperature after the end of treatment to enable the first blanket (2) wrapped on the blank (1) to fall off naturally;

(8) (II) composing second blankets (3) by placing the ceramic fiber with the thickness of 10 mm-15 mm on iron sheets with the thickness of 1 mm-1.5 mm and uniformly scattering the high-temperature binder powder with the thickness of 1-2 mm on the ceramic fiber, wherein the melting temperature of the high-temperature binder powder is 850-900 respectively wrapping the outer surface and the punched inner surface of the blank (1) after treatment in the step (I) with the second blankets to enable the second blankets (3) scattered with the high-temperature binder powder to be in close fit with the outer surface and the punched inner surface of the blank (1) respectively, respectively fixing the second blankets (3) on the outer surface and the punched inner surface of the blank (1), further heating to 1000-1060 C., then stopping heating, immediately performing blank holder reaming on the blank (1), and naturally cooling the blank (1) to room temperature after the end of treatment to enable the second blankets (3) wrapped on the blank (1) to fall off naturally;

(9) (III) As shown in (f)-(g) in FIG. 1, respectively wrapping the outer surface and the reamed inner surface of the blank after treatment in the step (II) with the second blankets to enable the second blankets 3 scattered with the high-temperature binder powder to be in close fit with the outer surface and the reamed inner surface of the blank 1 respectively, respectively fixing the second blankets 3 on the outer surface and the reamed inner surface of the blank 1, further heating to 985-1038 C., then stopping heating, immediately rolling the blank 1 to obtain a final product, and naturally cooling the blank 1 to room temperature after the end of treatment to enable the second blankets 3 wrapped on the blank 1 to fall off naturally.

(10) In the step (I), an iron wire with the diameter of 1-3 mm is used for fixing the first blanket 2 and the blank 1 together; or two iron wires with the diameter of 1-3 mm are used for bundling the first blanket 2 and the blank 1 together.

(11) In the step (II) and the step (Ill), after the second blankets 2 wrapped on the outer surface and the punched or the reamed inner surface of the blank 1 respectively wrap the outer surface and the punched or the reamed inner surface of the blank 1, the second blankets 3 are respectively fixed on the blank 1 at joints of the iron sheets on two lapped edges of the second blankets 3 by spot welding. If necessary, three iron sheet strips 4 with the width of 40-60 mm are used for connecting the second blanket 2 wrapped on the outer surface of the blank 1 and the second blanket 2 wrapped on the punched or the reamed inner surface of the blank 1 together on the upper and the lower end surfaces of the blank 1, one end of each iron sheet strip 4 is welded with the iron sheet on the second blanket 2 wrapped on the outer surface of the blank 1 together, and the other end of each iron sheet strip is welded with the iron sheet on the second blanket 2 wrapped on the punched or the reamed inner surface of the blank 1.

(12) The high-temperature binder powder contains 10-14% of Al2O3, 45-52% of SiO2, 12-16% of CaO, 4-8% of Na2O and 15-22% of B2O3. The ceramic fiber is the ceramic fiber containing 44% of Al2O3, 52% of SiO2, 1% of Fe2O3 and the balance of ZrO2. The heating is performed in an electric furnace.

(13) Comparison of surface cracks of the forging before and after using the invention:

(14) TABLE-US-00002 Number of cracks Positions of Depth of cracks (strips) cracks (mm) Original process Many Sharp corner 0-3 mm positions After using the No cracks invention

(15) Industrial applicability: the application can be used in industry and has industrial applicability.

(16) It should be noted that for those of skill in the art, a plurality of improvements and modifications can be made without departing from the principle of the invention, and these improvements and modifications should also be considered to be within the protection scope of the invention. The various components which are not clear in the embodiment can be implemented by using the prior art.