Additive manufactured article made of nicrmo-based alloy having p phase in structure

Abstract

To provide a laminated shaped body using an NiCrMo-based alloy having both corrosion resistance and high hardness.SOLUTION: A additively-manufactured article comprising a NiCrMo-based alloy containing a P phase in a constituent phase, the additively-manufactured article being produced by additive manufacturing using a NiCrMo-based alloy powder containing, in mass%, Cr:17.0 to 25.0%, Mo: 13.0 to 22.0%, Al: 0 to 3.0%, and Nb: 0 to 3.0%, the balance being Ni and inevitable impurities.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an additively manufactured object made of a NiCrMo-based alloy, which is manufactured by a three-dimensional additive manufacturing method, which is a rapid melting and rapid solidification process. [Background technology]

[0002] In applications requiring corrosion resistance, Ni-based alloys, Co-based alloys, etc. have been used until now. In recent years, the required properties have increased in order to be able to adapt to more severe environments.

[0003] Therefore, a NiCrMo-based alloy has been proposed in which intermetallic compounds are dispersed in a matrix primarily composed of Ni (see Patent Document 1). The alloy contains: more than 18% to less than 21% Cr, more than 18% to less than 21% Mo, more than 1% to less than 3.4% Ta, 0.001 to 0.05% Mg, 0.001 to 0.04% N, 0.05 to 0.5% Mn, 0.01 to 2% Fe, 0.01 to 0.1% Si, 0.01 to 0.5% Al, 0.01 to less than 0.1% Cu, and 0.001 to less than 0.1% V, with the remainder being Ni and unavoidable impurities, with the amount of C contained as an unavoidable impurity being 0.05% or less. However, because the amounts of components that contribute to corrosion resistance in the matrix tend to be insufficient, the corrosion resistance of this alloy is not sufficient.

[0004] The applicant has proposed a method for manufacturing a compact by HIP molding a NiCrMo-based alloy powder containing 18.0-28.0% Cr, 10.0-25.0% Mo, 1.0-3.0% Al, and 25-50% Cr+Mo at 1200°C, followed by solution treatment (see Patent Document 2). However, since this is a HIP sintered body and not an additive manufactured body, it has a different structure from additive manufactured bodies that involve rapid solidification through rapid cooling.

[0005] Another Ni-based alloy proposed is Ni-18.9Mo-19.3Cr-1.69Ta (see Patent Document 3). It is described that aging treatment causes the intermetallic compound Ni2(Cr,Mo) to precipitate in nano-sized particles, resulting in precipitation hardening. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4816950 [Patent Document 2] Patent No. 7406329 [Patent Document 3] Patent No. 7323010 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide an additive manufacturing product using a NiCrMo-based alloy that combines corrosion resistance and high hardness. [Means for solving the problem]

[0008] As a result of extensive research, the inventors have found that by controlling the heat treatment conditions of an additive manufacturing body made of a NiCrMo-based alloy, it is possible to obtain an additive manufacturing body of a NiCrMo-based alloy containing a fine P phase as a constituent phase. 21 Ni 20 This refers to:

[0009] The first means for solving the problems of the present invention is an additively manufactured body made of a NiCrMo-based alloy containing a P phase among its constituent phases. That is, the additively manufactured body contains a P phase among its constituent phases, which is additively manufactured using a NiCrMo-based alloy powder.

[0010] The second means is the layered object according to the first means, characterized in that the layered object is a P phase having a major axis of 1000 nm or less.

[0011] The third method is to 2The layered product according to the first or second aspect is characterized in that the area ratio of the coarse Mo compound phase is 7% or less.

[0012] The fourth means is an additive manufacturing body according to any one of the first to third means, characterized in that it is an additive manufacturing body produced by additive manufacturing using NiCrMo-based alloy powder containing, in mass %, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, 0 to 3.0% Nb, with the remainder being Ni and unavoidable impurities.

[0013] That is, the additively manufactured body is made of a NiCrMo-based alloy containing a P phase among its constituent phases, and is additively manufactured using a NiCrMo-based alloy powder containing, by mass %, 17.0-25.0% Cr, 13.0-22.0% Mo, 0-3.0% Al, 0-3.0% Nb, and the remainder being Ni and unavoidable impurities. Furthermore, the additively manufactured body made using this NiCrMo-based alloy powder has a P phase with a major axis of 1000 nm or less and / or an area of ​​1 μm 2 The area ratio of the above coarse Mo compound phases is 7% or less.

[0014] The fifth means is a layered object characterized by further containing C: 0.01 to 0.5% in addition to the components described in the fourth means.

[0015] That is, the layered manufactured body according to any one of the first to third means is characterized in that it is an layered manufactured body produced by layered manufacturing using NiCrMo-based alloy powder containing, by mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, 0 to 3.0% Nb, 0.01 to 0.5% C, with the remainder being Ni and unavoidable impurities.

[0016] The sixth means is a layered object characterized by further containing 0.1 to 10.0% of W in addition to the components described in the fourth or fifth means.

[0017] That is, the layered manufactured body according to any one of the first to third means is characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass %, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C and 0.1 to 10.0% W as optional additional components, with the remainder being Ni and unavoidable impurities.

[0018] The seventh aspect of the present invention is a layered manufactured body characterized in that, in addition to the components described in any one of the fourth to sixth aspects, it further contains Fe: 0.1 to 8.0%.

[0019] That is, the layered manufactured body according to any one of the first to third means is characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, by mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C, 0.1 to 10.0% W, and 0.1 to 8.0% Fe as optional additional components, with the remainder being Ni and unavoidable impurities.

[0020] The eighth aspect of the present invention is a layered manufactured object characterized by further containing Cu: 0.1 to 6.0% in addition to the components described in any one of the fourth to seventh aspects.

[0021] That is, the layered manufactured body according to any one of the first to third means is characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass %, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C, 0.1 to 10.0% W, 0.1 to 8.0% Fe, and 0.1 to 6.0% Cu as optional additional components, with the remainder being Ni and unavoidable impurities. [Effects of the Invention]

[0022] According to the present invention, it is possible to obtain a metal additive manufacturing product of a NiCrMo-based alloy with high corrosion resistance and high hardness. The present invention provides a manufactured product with a hardness of 37 HRC or more and a hydrofluoric acid corrosion resistance of 1.00 or less. [Brief explanation of the drawings]

[0023] [Figure 1] The image in Figure 1 is a transmission electron microscope (TEM) image showing the P phase in the structure of an additive manufacturing body made using the NiCrMo-based alloy powder of the present invention, which was solution-treated at 1150°C and then aged at 750°C. [Figure 2] The image in Figure 2 is a backscattered electron image taken by a scanning electron microscope (SEM) of the structure of an additive manufacturing body made using the NiCrMo-based alloy powder of the present invention, which was solution-treated at 1150°C and then aged at 650°C. The white areas are mainly coarse Mo compounds. [Figure 3] The image in Figure 3 is a backscattered electron SEM image of the structure of an additive manufacturing body made using the NiCrMo-based alloy powder of the present invention, which was aged at 650°C without solution treatment. [Figure 4] 1 is a graph showing the relationship between the presence or absence of solution treatment, the aging temperature, and the major axis of the P phase in Examples and Comparative Examples. [Figure 5] 1 is a graph showing the relationship between the presence or absence of solution treatment, the major axis of the P phase, and the hydrofluoric acid corrosion resistance in Examples and Comparative Examples. [Figure 6] 1 is a graph showing the relationship between the presence or absence of solution treatment, and the aging temperature and hardness in Examples and Comparative Examples. [Figure 7] 1 is a graph showing the relationship between the presence or absence of solution treatment, the major axis of the P phase, and hardness in Examples and Comparative Examples. [Figure 8] 1 is a graph showing the relationship between the presence or absence of solution treatment, the aging temperature, and the area ratio of Mo compounds in Examples and Comparative Examples. [Figure 9] 1 is a graph showing the relationship between the presence or absence of solution treatment, the area ratio of Mo compounds, and the hydrofluoric acid corrosion resistance in Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0024] Prior to describing the embodiments of the present invention, the reasons for specifying the preferred component composition of the NiCrMo alloy used in the present invention will be explained. The balance is Ni and unavoidable impurities. The percentages of the chemical components are by mass.

[0025] Mo: 13.0-22.0% Mo dissolves in the Ni base material and contributes to the corrosion resistance of the alloy. Mo particularly contributes to corrosion resistance against non-oxidizing acids. When a Mo-containing base material is subjected to solution treatment and aging treatment, numerous Mo compound phases precipitate. These Mo compound phases are dispersed in the matrix. The main component of the Mo compound phase is Mo. This Mo compound phase also has high hardness. This Mo compound phase can contribute to the wear resistance of the alloy. From these perspectives, the Mo content is set to 13.0% or more, preferably 14.0% or more, and more preferably 15.0% or more. On the other hand, excessive Mo increases costs, so from the viewpoint of cost, Mo is set to 22.0% or less, preferably 20.0% or less, more preferably 18.0% or less, and even more preferably 17.0% or less.

[0026] Cr: 17.0~25.0% Cr dissolves in the base material Ni and contributes to the corrosion resistance of the alloy. Cr also has a high resistance to various acids. This contributes to corrosion resistance against corrosion. Cr can be contained in the Mo compound phase precipitated by solution treatment and aging treatment, and this Mo compound phase has high hardness. From the viewpoint of precipitating a Mo compound phase having sufficient Cr and ensuring that sufficient Cr exists in the matrix after precipitation of the Mo compound phase, the Cr content is set to 17.0% or more, preferably 18.5% or more, more preferably 20.0% or more, and even more preferably 21.0% or more. On the other hand, from the viewpoint of avoiding increased costs, the Cr content is set to 25.0% or less, preferably 24.0% or less, and more preferably 23.0% or less.

[0027] Al: 0 to 3.0% Al dissolves in the Ni base material, and when a base material containing Al is subjected to solution treatment and aging treatment, numerous γ' phases (NiAl phases) precipitate and disperse in the matrix. Alloys containing this γ' phase exhibit high hardness. Therefore, up to 3.0% Al can be added to the NiCrMo-based alloy of the present invention. From the viewpoint of γ' phase precipitation, the Al content is preferably 0.5 to 2.5%, more preferably 1.0 to 2.5%, and even more preferably 1.5 to 2.5%.

[0028] Nb: 0 to 3.0% Nb dissolves in the base material, Ni, and the amount of Nb dissolved in Ni during solution treatment is greater than that of Al. In alloys containing Nb, many Mo compounds can dissolve during solution treatment. This alloy exhibits a large difference in hardness before and after aging treatment. This alloy has high machinability after solution treatment. Furthermore, Nb dissolves in the γ' phase by substitution with Al, forming a Ni3(Al,Nb) phase. This γ' phase hardens during aging treatment. Therefore, up to 3.0% Nb can be added to the NiCrMo-based alloy of the present invention. From the viewpoint of γ' phase precipitation, the Nb content is preferably 0.2 to 2.5%, more preferably 0.5 to 2.0%, and even more preferably 0.5 to 1.2%.

[0029] The following will explain C, W, Fe, and Cu that can be optionally added to the present invention.

[0030] C: 0.01 to 0.5% C is an element that contributes to the formation of carbides and has the effect of improving hardness, and from this viewpoint, when C is added, the content is preferably 0.03% or more, more preferably 0.08% or more, and even more preferably 0.15% or more. On the other hand, if too much C is added, coarse carbides are formed and corrosion resistance deteriorates, so C must be 0.5% or less, preferably 0.40% or less, more preferably 0.35% or less, and even more preferably 0.30% or less.

[0031] W: 0.1 to 10.0% W is an element that functions similarly to Mo, but in some cases, the use of W can improve corrosion resistance. Therefore, when W is added, the content is preferably 0.5% or more, more preferably 2.0% or more, and even more preferably 3.0% or more. On the other hand, from the viewpoint of cost, the W content is preferably 9.0% or less, more preferably 8.0% or less, and even more preferably 7.0% or less.

[0032] Fe: 0.1 to 8.0% Fe can be added to reduce costs. Preferably, Fe is 0.5% or more, more preferably 1.0% or more, and even more preferably 2.5% or more. On the other hand, since adding too much Fe deteriorates corrosion resistance, Fe is preferably 7.0% or less, more preferably 6.0% or less, and even more preferably 5.0% or less.

[0033] Cu: 0.1 to 6.0% Cu can improve corrosion resistance to hydrofluoric acid. From this viewpoint, the Cu content is preferably 0.5% or more, more preferably 1.5% or more, and even more preferably 2.0% or more. On the other hand, since adding too much Cu reduces hardness, the Cu content is preferably 5.0% or less, more preferably 4.5% or less, and even more preferably 4.0% or less.

[0034] The NiCrMo-based alloy additive manufacturing body according to the present invention is produced by metal additive manufacturing using a NiCrMo-based alloy as the material. The additive manufacturing body can be solution-treated and then aged to obtain an additive manufacturing body containing a P phase. The solution-treatment before aging can also be omitted, as described in detail below.

[0035] [Powder] The NiCrMo alloy powder used in the present invention is preferably a gas atomized powder, which is easy to obtain a spherical shape from the viewpoints of flowability, packing property, etc. The NiCrMo alloy powder preferably has an average particle size of 10 μm or more and 100 μm or less on a volume average basis.

[0036] [molding] A method for producing shaped bodies includes a rapid melting and rapid solidification process, which involves melting and solidifying a metal powder. Specific examples of this process include three-dimensional additive manufacturing, thermal spraying, laser coating, and cladding. The NiCrMo-based alloy powder of the present invention is particularly suitable for powder bed fusion-based three-dimensional additive manufacturing, allowing for the formation of large-sized, high-density shaped bodies.

[0037] For example, a 3D printer can be used as a three-dimensional additive manufacturing method. Common methods include powder bed fusion (powder bed) and directed energy deposition (deposition). In the powder bed method, metal powder is spread from a powder supply unit such as a tank to the additive manufacturing unit using a blade or brush called a recoater, spreading the powder thinly and uniformly. A heat source is then applied to the required areas in the additive manufacturing unit to selectively melt and form the desired shape. In the deposition method, a laser is irradiated while metal powder is being supplied, depositing the molten metal, and the nozzle is moved three-dimensionally to build up the model.

[0038] For example, in the powder bed method, a spread NiCrMo alloy powder of the present invention is irradiated with a laser beam or an electron beam, whereby the particles are rapidly heated and melted, and then the melted particles are rapidly solidified. This melting and solidification process bonds the particles together. Since the beam is irradiated selectively to a portion of the spread NiCrMo alloy powder, the portion of the spread powder that is not irradiated with the beam does not melt, and a bonded layer is formed only in the portion that is irradiated with the beam by rapid melting and rapid solidification.

[0039] A thin layer of NiCrMo alloy powder is then spread on top of the formed bonding layer. A laser beam or electron beam is irradiated onto a portion of this NiCrMo alloy powder, causing the particles to rapidly melt and then rapidly solidify. This melting and solidification process bonds the particles in the powder together, forming a new bonding layer. This new bonding layer also bonds with the existing bonding layer.

[0040] By repeating the bonding process through irradiation, the aggregate of bonding layers gradually grows. This growth results in a shaped object with a desired three-dimensional shape. This additive manufacturing method makes it easy to obtain shaped objects with complex shapes.

[0041] [Heat treatment] When using NiCrMo alloy powder for additive manufacturing, the unheat-treated body is not used as is, but rather the unheat-treated body is solution-treated and then aged to obtain a body containing the P phase (hereinafter, "solution treated and aged" is also referred to as "STA"). The solution treatment before aging can also be omitted (hereinafter, "direct aged" is also referred to as "DA").

[0042] The solution treatment is carried out at a temperature of 1000° C. or higher. The solution treatment is preferably carried out at a temperature of 1050° C. or higher, more preferably at a temperature of 1100° C. or higher, and even more preferably at a temperature of 1150° C. or higher.

[0043] Aging treatment is generally carried out at a temperature of 600°C or higher. As shown in Figures 4, 6 and 8, it is preferable to carry out aging treatment at an aging temperature in the range of 650-700°C.

[0044] [P phase in NiCrMo alloys] The P phase of the present invention is a NiCrMo-based compound (Cr9Mo 21 Ni 20 ), which are needle-shaped precipitates that appear black in the center of the TEM image in Figure 1. The crystal system of the P phase is orthorhombic, and its space group is Pnma, so it can be identified as the P phase from the TEM electron diffraction pattern.

[0045] This P phase is not observed in the ingot material of Patent Document 2, and is a compound that precipitates during the aging treatment of a metal additive manufacturing body that has been rapidly solidified. That is, the additive manufacturing body of the present invention has fine solidification segregation of Mo due to rapid solidification. The P phase precipitates from the fine segregation of Mo, and it is believed that the fine segregation structure unique to additive manufacturing is the cause of the precipitation of the P phase.

[0046] It should be noted that Patent Document 3, which relates to a NiCrMo-based alloy having a different chemical composition from that of the present invention, differs from the present invention in that it utilizes the precipitation of Ni2(Cr,Mo) instead of the P phase.

[0047] [Morphology of the P phase] The morphology of the P phase can be controlled by heat treatment. When coarse P phases with a major axis exceeding 1000 nm are precipitated, the area ratio of the Cr- and Mo-deficient phases near the precipitates increases compared to the case of fine P phase precipitation, deteriorating the corrosion resistance of the matrix. Therefore, corrosion resistance can be improved by controlling the major axis of the P phase to 1000 nm or less. Furthermore, a fine P phase increases the amount of precipitation strengthening and increases hardness. From these viewpoints, the major axis of the P phase is preferably 1000 nm or less, more preferably 700 nm or less, even more preferably 400 nm or less, and even more preferably 100 nm or less.

[0048] [Calculation method for the major axis of the P phase] TEM images were taken at five locations within a 5 μm x 5 μm area, and the shape of the needle-like P phase contained therein was evaluated by image analysis to determine its long diameter. The average of the long diameters obtained was calculated to be the long diameter of the P phase.

[0049] [Area ratio of coarse Mo compounds] When solution treatment is performed, coarse Mo-based compounds on the μm scale are precipitated, as shown in Figure 2. These coarse Mo-based compounds on the μm scale are different compounds from the nm-scale P phase. Given that solution treatment is always performed on wrought NiCrMo-based alloys, it is virtually impossible to obtain a structure free of coarse Mo compounds through direct aging treatment without using metal additive manufacturing. From these perspectives, the area ratio of coarse Mo compounds is preferably 5% or less, more preferably 3% or less, and even more preferably 1% or less.

[0050] [Calculation method for the area ratio of coarse Mo compounds] In the present invention, the term "coarse compounds" refers to compounds with an area of ​​1 μm 2 These are defined as Mo-based compounds. Coarse Mo compounds can be identified based on the white areas in the SEM backscattered electron image, as shown in Figure 2, and the area ratio can be calculated using image analysis software. Specifically, five fields of view are photographed at 4000x magnification, and the average of the values ​​calculated using image analysis software is evaluated as the area ratio.

[0051] [Powder] Table 1 shows the chemical compositions of the NiCrMo-based alloy powders used in Examples 1 to 10 and Comparative Examples 1 to 4. The NiCrMo-based alloy powders were prepared by vacuum melting and inert gas atomization using raw materials with the compositions shown in Table 1, and then classified using a -63 μm sieve. The obtained NiCrMo-based alloy powders were used as the raw materials for additive manufacturing in the examples and comparative examples.

[0052] [Table 1]

[0053] [molding] Using the NiCrMo alloy powder listed in Table 1 as the raw material, a 10 x 10 x 15 mm high block was additively manufactured using a 3D additive manufacturing device (EOS-M280) to produce test specimens for evaluating hardness and corrosion resistance. The manufacturing conditions used were the standard device parameters IN718 (layer thickness 40 μm), which are the conditions recommended by EOS as being suitable for manufacturing using the EOS-M280.

[0054] [Heat treatment] Tables 2 and 3 show the heat treatment conditions for the examples and comparative examples. The solution treatment temperatures for the solution treatment and the aging temperatures for the aging treatment are shown in Tables 2 and 3. The solution treatment was performed by holding the specimens at the solution temperature for 4 hours followed by air cooling. The aging treatment was performed by holding the specimens at the aging temperature for 16 hours followed by air cooling. All heat treatments were performed in the air.

[0055] [Table 2]

[0056] [Table 3]

[0057] [Hardness measurement] After heat treatment, a block of 10 mm x 10 mm x 15 mm height was cut at a height of 7.5 mm, and the Rockwell hardness was measured on the cut surface. A hardness of 37 HRC or greater was evaluated as good, and the results are shown in Tables 2 and 3. Underlines indicate results that did not meet the evaluation criteria.

[0058] [Measurement of hydrofluoric acid corrosion resistance] A 10 x 10 x 15 mm block was heat-treated and then polished on all sides. This test piece was immersed in a 10% aqueous solution of hydrofluoric acid for 10 hours. The temperature of this solution was 40°C. Furthermore, the mass loss of the test piece was measured, and the corrosion resistance was evaluated from the surface area. Hydrofluoric acid corrosion resistance of 1.00 or less was evaluated as good, and the results are shown in Tables 2 and 3. Underlines indicate results that did not meet the evaluation criteria.

[0059] In the examples, the layered manufactured body produced using the NiCrMo-based alloy powder of the present invention had a hardness of 37 HRC or more and a hydrofluoric acid corrosion resistance of 1.00 or less, satisfying the standards for both hardness and corrosion resistance.

[0060] On the other hand, the comparative examples had poor corrosion resistance, with hydrofluoric acid corrosion resistance exceeding 1.00, or had hardness below 37 HRC, meaning that the corrosion resistance or hardness was insufficient. In Comparative Example 1, the aging temperature was too high, so the major axis of the P phase became large, resulting in poor corrosion resistance. Comparative Example 2 was solution treated, but the aging temperature was too high, so the major axis of the P phase became large and the corrosion resistance deteriorated. In Comparative Example 3, the aging temperature was too low, so the P phase did not precipitate, and the hardness that would have been obtained by precipitation through aging treatment was lower than that of the Examples. [Industrial Applicability]

[0061] The additive manufacturing product using the NiCrMo-based alloy of the present invention can be suitably applied to various products that require high corrosion resistance and high hardness.

Claims

1. An additively manufactured body made of a NiCrMo-based alloy containing a P phase among its constituent phases.

2. The layered product according to claim 1 , characterized in that the layered product is a P phase having a major axis of 1000 nm or less.

3. Area is 1 μm 2 2. The layered product according to claim 1, wherein the area ratio of the coarse Mo compound phase is 7% or less.

4. The layered manufactured body according to any one of claims 1 to 3, characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, 0 to 3.0% Nb, and the remainder being Ni and unavoidable impurities.

5. The layered manufactured body according to any one of claims 1 to 3, characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, 0 to 3.0% Nb, 0.01 to 0.5% C, with the remainder being Ni and unavoidable impurities.

6. 4. The layered manufactured body according to claim 1, characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C and 0.1 to 10.0% W as selective additional components, with the remainder being Ni and unavoidable impurities.

7. 4. The layered manufactured body according to claim 1, characterized in that it is an layered manufactured body produced by layering using a NiCrMo-based alloy powder containing, in mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C, 0.1 to 10.0% W, and 0.1 to 8.0% Fe as selective additional components, with the remainder being Ni and unavoidable impurities.

8. 4. The layered manufactured body according to claim 1, wherein the layered manufactured body is an layered manufactured body obtained by layer manufacturing using a NiCrMo-based alloy powder containing, by mass%, 17.0 to 25.0% Cr, 13.0 to 22.0% Mo, 0 to 3.0% Al, and 0 to 3.0% Nb, and further containing at least one of 0.01 to 0.5% C, 0.1 to 10.0% W, 0.1 to 8.0% Fe, and 0.1 to 6.0% Cu as selective additional components, with the remainder being Ni and unavoidable impurities.

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