阅读说明：本技术 一种in718粉末合金材料的制备方法 (Preparation method of IN718 powder alloy material ) 是由 方晓汾 于 2020-06-18 设计创作，主要内容包括：本发明涉及IN718粉末合金制备技术领域,公开了一种IN718粉末合金材料的制备方法。该方法包括：(1)将镍基高温合金原料和Nb进行熔炼,其中,以镍基高温合金原料和Nb的总重量为100重量份计,所述镍基高温合金原料为95.5-98.5重量份,Nb为1.5-4.5重量份；(2)采用等离子旋转电极法进行处理；(3)筛分、除杂后置于碳钢包套内,升温至1155-1170℃,热等静压处理2.5-3.5小时；(4)继续升温至1175-1185℃,固溶处理2-3小时；(5)进行二次时效处理。该方法制备的IN718粉末合金材料拉伸强度和屈服强度明显增加,而且断面收缩率和伸长率也明显提升,力学性能得到明显改善。(The invention relates to the technical field of preparation of IN718 powder alloy, and discloses a preparation method of an IN718 powder alloy material. The method comprises the following steps: (1) smelting a nickel-based high-temperature alloy raw material and Nb, wherein the weight of the nickel-based high-temperature alloy raw material is 95.5-98.5 parts by weight and the weight of Nb is 1.5-4.5 parts by weight based on 100 parts by weight of the total weight of the nickel-based high-temperature alloy raw material and Nb; (2) processing by adopting a plasma rotating electrode method; (3) screening, removing impurities, placing in a carbon steel ladle sleeve, heating to 1155-1170 ℃, and performing hot isostatic pressing for 2.5-3.5 hours; (4) continuously heating to 1175-1185 ℃, and carrying out solution treatment for 2-3 hours; (5) and carrying out secondary aging treatment. The IN718 powder alloy material prepared by the method has the advantages that the tensile strength and the yield strength are obviously increased, the reduction of area and the elongation are also obviously improved, and the mechanical property is obviously improved.)

1. A method of making an IN718 powder alloy material, the method comprising the steps of:

(1) putting a nickel-based high-temperature alloy raw material and Nb into a vacuum induction furnace for smelting to obtain a master alloy, wherein the nickel-based high-temperature alloy raw material accounts for 95.5-98.5 parts by weight and the Nb accounts for 1.5-4.5 parts by weight based on 100 parts by weight of the total weight of the nickel-based high-temperature alloy raw material and the Nb;

(2) processing the master alloy by adopting a plasma rotating electrode method to obtain alloy powder with the particle size of 50-70 mu m;

(3) screening and removing impurities from the alloy powder, placing the alloy powder in a carbon steel ladle sleeve, heating to 1155-1170 ℃, and performing hot isostatic pressing treatment for 2.5-3.5 hours under the conditions of 105-115MPa to obtain a blank;

(4) continuously heating to 1175-1185 ℃, and carrying out solution treatment on the blank for 2-3 hours to obtain an alloy pattern;

(5) carrying out secondary aging treatment on the alloy pattern, wherein the temperature of the final aging treatment is 750-770 ℃;

in the step (1), the nickel-based superalloy material includes 50 to 60 wt% of Ni, 18 to 25 wt% of Cr, 3 to 3.5 wt% of Mo, 0.2 to 0.8 wt% of Al, 0.68 to 1.12 wt% of Ti, 0.09 wt% or less of C, 0.35 wt% or less of Mn, 0.33 wt% or less of Si, 0.015 wt% or less of S, 0.28 wt% or less of Cu, and 0.006 or less of B, with the balance being Al.

2. The method of claim 1, wherein the nickel-base superalloy material comprises 55-58 wt% Ni, 18-20 wt% Cr, 3-3.2 wt% Mo, 0.4-0.7 wt% Al, 0.687-1 wt% Ti, 0.08 wt% or less C, 0.31 wt% or less Mn, 0.3 wt% or less Si, 0.012 wt% or less S, 0.25 wt% or less Cu, and 0.005 wt% or less B, with the balance being Al.

3. The method as claimed in claim 1, wherein in the step (1), the ni-based superalloy raw material is 96.5 to 97.5 parts by weight and the Nb is 2.5 to 3.5 parts by weight, based on 100 parts by weight of the total of the ni-based superalloy raw material and the Nb.

4. The method according to claim 1, wherein in the step (2), the master alloy is treated by a plasma rotary electrode method to obtain alloy powder having a particle size of 55 to 65 μm.

5. The method as claimed in claim 1, wherein in step (3), the hot isostatic pressing treatment is performed by raising the temperature to 1162-1168 ℃; and carrying out hot isostatic pressing treatment under the conditions of 108-112 MPa.

6. The method of claim 1, wherein in step (3), the screened oversize is less than 1.2%.

7. The method as claimed in claim 1, wherein in step (4), the temperature is raised to 1178-1182 ℃ for solution treatment.

8. The method as claimed in claim 1, wherein in step (5), the temperature of the last aging treatment is 755-765 ℃.

9. An IN718 powder alloy material produced by the method of any one of claims 1 to 8.

10. The use of the IN718 powder alloy material of claim 9 IN an internal combustion engine.

Technical Field

The invention relates to the technical field of preparation of IN718 powder alloy, IN particular to a preparation method of an IN718 powder alloy material.

Background

The high-temperature alloy prepared by adopting the powder metallurgy process has multiple excellent properties, comprises fine alloy structure crystal grains, does not generate a macrosegregation phenomenon, can achieve very high alloying, and has high yield strength and good fatigue resistance, so the high-temperature alloy is widely applied to manufacturing various high-temperature parts, and becomes an important application material in the fields of automobiles and aviation. However, with the continuous upgrading and progress of the aircraft engine technology, the first generation and second generation powder metallurgy high temperature alloys cannot meet the performance requirements of materials, so researchers develop third generation powder metallurgy high temperature alloys which can withstand the high temperature use environment of 700-.

Nb belongs to a class of high-efficiency reinforcing elements, and can be added into the nickel-based high-temperature alloy to prepare carbide with a more stable structure, and meanwhile, the Nb-based high-temperature alloy can effectively resist the expansion of cracks and bear the performance of high-temperature corrosion. Because Nb has a large atomic radius, a large Vigarde coefficient can be achieved, and the gamma' phase lattice constant and the solid solution strengthening effect are obviously improved. Nb can form a good compatible state with the gamma ' phase of the alloy, so that the gamma ' phase obtains good high temperature resistance, thereby inhibiting the aggregation and growth processes of the gamma ' phase and obviously improving the mechanical strength of the alloy in a high temperature environment. In addition, the alloy can obtain better oxidation resistance and corrosion resistance by adding Nb, and simultaneously obtain strong crack expansion resistance. It has also been found experimentally that by adding Nb to the CastIN617 alloy, more high temperature tensile strength can be achieved.

However, few studies are currently being made to produce 718 powder alloy materials by adding Nb to nickel-base superalloys.

Disclosure of Invention

The invention aims to overcome the problem of few researches on preparation of 718 powder alloy materials by adding Nb into nickel-base high-temperature alloy IN the prior art, and provides a preparation method of IN718 powder alloy materials.

IN order to achieve the above object, one aspect of the present invention provides a method for preparing an IN718 powder alloy material, the method comprising the steps of:

(1) putting a nickel-based high-temperature alloy raw material and Nb into a vacuum induction furnace for smelting to obtain a master alloy, wherein the nickel-based high-temperature alloy raw material accounts for 95.5-98.5 parts by weight and the Nb accounts for 1.5-4.5 parts by weight based on 100 parts by weight of the total weight of the nickel-based high-temperature alloy raw material and the Nb;

(2) processing the master alloy by adopting a plasma rotating electrode method to obtain alloy powder with the particle size of 50-70 mu m;

(3) screening and removing impurities from the alloy powder, placing the alloy powder in a carbon steel ladle sleeve, heating to 1155-1170 ℃, and performing hot isostatic pressing treatment for 2.5-3.5 hours under the conditions of 105-115MPa to obtain a blank;

(4) continuously heating to 1175-1185 ℃, and carrying out solution treatment on the blank for 2-3 hours to obtain an alloy pattern;

(5) carrying out secondary aging treatment on the alloy pattern, wherein the temperature of the final aging treatment is 750-770 ℃;

in the step (1), the nickel-based superalloy material includes 50 to 60 wt% of Ni, 18 to 25 wt% of Cr, 3 to 3.5 wt% of Mo, 0.2 to 0.8 wt% of Al, 0.68 to 1.12 wt% of Ti, 0.09 wt% or less of C, 0.35 wt% or less of Mn, 0.33 wt% or less of Si, 0.015 wt% or less of S, 0.28 wt% or less of Cu, and 0.006 or less of B, with the balance being Al.

Preferably, the nickel-based superalloy material includes 55 to 58 wt% of Ni, 18 to 20 wt% of Cr, 3 to 3.2 wt% of Mo, 0.4 to 0.7 wt% of Al, 0.687 to 1 wt% of Ti, 0.08 wt% or less of C, 0.31 wt% or less of Mn, 0.3 wt% or less of Si, 0.012 wt% or less of S, 0.25 wt% or less of Cu, and 0.005 wt% or less of B, with the balance being Al.

Preferably, in the step (1), the Ni-based superalloy material is 96.5 to 97.5 parts by weight and Nb is 2.5 to 3.5 parts by weight based on 100 parts by weight of the total weight of the Ni-based superalloy material and Nb

Preferably, in the step (2), the master alloy is treated by a plasma rotary electrode method to obtain alloy powder with the particle size of 55-65 μm.

Preferably, in the step (3), the temperature is raised to 1162-1168 ℃ for hot isostatic pressing treatment; and carrying out hot isostatic pressing treatment under the conditions of 108-112 MPa.

Preferably, in step (3), the screened oversize is less than 1.2%.

Preferably, in the step (4), the temperature is continuously increased to 1178-1182 ℃ for solution treatment.

Preferably, in step (5), the temperature of the last aging treatment is 755-.

IN a second aspect, the present invention provides an IN718 powder alloy material prepared by the method described above.

IN a third aspect, the present invention provides a use of the aforementioned IN718 powder alloy material IN an internal combustion engine.

The invention prepares a 718 powder alloy material by adding a proper amount of Nb into a specific nickel-based high-temperature alloy raw material and matching with a specific method. The tensile test of the obtained 718 powder alloy material at 650 ℃ shows that 1.5-4.5% of Nb is added into the nickel-based superalloy raw material, so that the tensile strength and yield strength of the prepared IN718 powder alloy material are obviously increased, and particularly 2.5-3.5% of Nb is added into the nickel-based superalloy raw material, so that the tensile strength and yield strength of the prepared IN718 powder alloy material are obviously increased, and the reduction of area and the elongation are also obviously improved.

Drawings

FIG. 1 is a microstructure view of fractures after stretching at 650 ℃ of the finished material prepared in example 1;

FIG. 2 is a microstructure of a fracture of the finished material prepared in comparative example 1 after stretching at 650 ℃;

FIG. 3 is a TEM image of the finished material prepared in example 1 after stretching at 650 ℃;

FIG. 4 is a TEM image of the finished material prepared in example 6 after stretching at 650 ℃;

FIG. 5 is a TEM image of the finished material prepared in example 7 after stretching at 650 ℃;

fig. 6 is a TEM image of the finished material prepared in comparative example 1 after stretching at 650 ℃.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The preparation method of the IN718 powder alloy material comprises the following steps:

(1) putting a nickel-based high-temperature alloy raw material and Nb into a vacuum induction furnace for smelting to obtain a master alloy, wherein the nickel-based high-temperature alloy raw material accounts for 95.5-98.5 parts by weight and the Nb accounts for 1.5-4.5 parts by weight based on 100 parts by weight of the total weight of the nickel-based high-temperature alloy raw material and the Nb;

(2) processing the master alloy by adopting a plasma rotating electrode method to obtain alloy powder with the particle size of 50-70 mu m;

(3) screening and removing impurities from the alloy powder, placing the alloy powder in a carbon steel ladle sleeve, heating to 1155-1170 ℃, and performing hot isostatic pressing treatment for 2.5-3.5 hours under the conditions of 105-115MPa to obtain a blank;

(4) continuously heating to 1175-1185 ℃, and carrying out solution treatment on the blank for 2-3 hours to obtain an alloy pattern;

(5) carrying out secondary aging treatment on the alloy pattern, wherein the temperature of the final aging treatment is 750-770 ℃;

in the step (1), the nickel-based superalloy material includes 50 to 60 wt% of Ni, 18 to 25 wt% of Cr, 3 to 3.5 wt% of Mo, 0.2 to 0.8 wt% of Al, 0.68 to 1.12 wt% of Ti, 0.09 wt% or less of C, 0.35 wt% or less of Mn, 0.33 wt% or less of Si, 0.015 wt% or less of S, 0.28 wt% or less of Cu, and 0.006 or less of B, with the balance being Al.

In a preferred embodiment, the nickel-base superalloy material comprises 55 to 58 wt% of Ni, 18 to 20 wt% of Cr, 3 to 3.2 wt% of Mo, 0.4 to 0.7 wt% of Al, 0.687 to 1 wt% of Ti, 0.08 wt% or less of C, 0.31 wt% or less of Mn, 0.3 wt% or less of Si, 0.012 wt% or less of S, 0.25 wt% or less of Cu, and 0.005 wt% or less of B, with the balance being Al.

In a specific embodiment, in step (1), Nb may be 1.5 parts by weight, 1.7 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, or 4.5 parts by weight, based on 100 parts by weight of the total weight of the nickel-base superalloy material and Nb.

In another preferred embodiment, in the step (1), the ni-based superalloy raw material is 96.5 to 97.5 parts by weight and Nb is 2.5 to 3.5 parts by weight, based on 100 parts by weight of the total of the ni-based superalloy raw material and Nb.

In a specific embodiment, in the step (2), the master alloy is treated by a plasma rotating electrode method to obtain an alloy powder having a particle size of 52 μm, 54 μm, 56 μm, 58 μm, 60 μm, 62 μm, 64 μm, 66 μm, 68 μm or 70 μm. In a preferred embodiment, in step (2), the master alloy is treated by a plasma rotary electrode method to obtain an alloy powder having a particle size of 55 to 65 μm.

In specific embodiments, in step (3), the hot isostatic pressing treatment may be performed by raising the temperature to 1155 ℃, 1156 ℃, 1158 ℃, 1160 ℃, 1162 ℃, 1164 ℃, 1166 ℃, 1168 ℃ or 1170 ℃; the hot isostatic pressing treatment may be carried out at 105MPa, 107MPa, 109MPa, 111MPa, 113MPa or 115 MPa.

In a preferred embodiment, in step (3), the temperature is raised to 1162-1168 ℃ for hot isostatic pressing treatment; and carrying out hot isostatic pressing treatment under the conditions of 108-112 MPa.

In the method of the present invention, in the step (3), the screened screen residue is less than 1.2%; preferably, the screened oversize is less than 1%; more preferably, the screened oversize is less than 0.8%.

In a specific embodiment, in step (4), the temperature may be further raised to 1175 ℃, 1177 ℃, 1179 ℃, 1181 ℃, 1183 ℃ or 1185 ℃ for solution treatment. In a preferred embodiment, the solution treatment is carried out by continuing to raise the temperature to 1178-1182 ℃.

In specific embodiments, in step (5), the temperature of the last aging treatment may be 754 ℃, 758 ℃, 762 ℃, 766 ℃ or 770 ℃. In a preferred embodiment, in step (5), the temperature of the last aging treatment is 755-.

IN a second aspect, the present invention provides an IN718 powder alloy material prepared by the method described above. The IN718 powder alloy material has good mechanical property at 650 ℃.

IN a third aspect, the present invention provides a use of the aforementioned IN718 powder alloy material IN an internal combustion engine. The invention can improve the performance by adding Nb into the nickel-based high-temperature alloy raw material, and prevent the material from deforming at high temperature. The IN718 powder alloy material prepared by the invention is a powder metallurgy sintering material, and is sintered into an internal combustion engine shell or other parts of an internal combustion engine when IN use, such as a valve seat, an exhaust valve conical surface of the internal combustion engine, a valve seat and the like.

The IN718 powder alloy material prepared by the invention can also be applied to a plasma surfacing process, a plasma spray welding process and a flame spraying process, and the added rare earth niobium trace element can refine grains and reduce the crack sensitivity of a welding layer.

The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.

The examples and comparative examples of the present invention are for explaining the preparation process of the IN718 powder alloy material for an internal combustion engine.