Additive fabricated body made of NiCrMo alloy having a P phase in its 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 a laminated body made of a NiCrMo-based alloy formed by a three-dimensional laminating and forming method, which is a rapid melting and rapid solidification process.

Background Art

[0002] In applications where corrosion resistance and the like are required, Ni-based alloys, Co-based alloys, etc. have been used heretofore. In recent years, in order to adapt to more severe environments, the required characteristics have been increasing.

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

[0004] The applicant has proposed a method for manufacturing a formed body in which a NiCrMo-based alloy powder having Cr: 18.0 to 28.0%, Mo: 10.0 to 25.0%, Al: 1.0 to 3.0% and Cr + Mo: 25 to 50% is HIP formed at 1200 ° C and subjected to a solution treatment (see Patent Document 2). However, since it is a sintered body by HIP and not a laminated body, it has a different structure from a laminated body accompanied by rapid solidification.

[0005] As another Ni-based alloy, Ni-18.9Mo-19.3Cr-1.69Ta has been proposed (see Patent Document 3). It is described that precipitation hardening occurs by precipitation of intermetallic compound Ni2(Cr,Mo) in nano size by performing aging treatment. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 4816950 [Patent Document 2] Patent No. 7406329 [Patent Document 3] Patent No. 7323010 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The problem that this invention aims to solve is to provide an additively fabricated body using a NiCrMo-based alloy that achieves both corrosion resistance and high hardness. [Means for solving the problem]

[0008] As a result of diligent research, the inventors have found that by controlling the heat treatment conditions of an additively fabricated NiCrMo alloy, it is possible to obtain an additively fabricated NiCrMo alloy containing a fine P phase as a constituent phase. In this invention, the P phase refers to Cr9Mo, a compound of the NiCrMo system. 21 Ni 20 It refers to that.

[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 in its constituent phases. That is, an additively manufactured body containing a P phase in its constituent phases, manufactured using NiCrMo-based alloy powder.

[0010] The second method is a laminated body described in the first method, characterized in that it is a P-phase with a major axis of 1000 nm or less.

[0011] The third method is to use an area of ​​1 μm 2The additively fabricated body according to the first or second method, characterized in that the area ratio of the coarse Mo compound phase is 7% or less.

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

[0013] Specifically, the additively fabricated body is made of a NiCrMo alloy containing a P phase in its constituent phases, and is fabricated using a NiCrMo alloy powder containing, by mass%, 17.0-25.0% Cr, 13.0-22.0% Mo, 0-3.0% Al, and 0-3.0% Nb, with the remainder being Ni and unavoidable impurities. Furthermore, the additively fabricated body made using this NiCrMo alloy powder has a P phase with a major axis of 1000 nm or less and / or an area of ​​1 μm². 2 The characteristic feature is that the area ratio of the coarse Mo compound phase is 7% or less.

[0014] The fifth method is a laminated body characterized by containing an additional 0.01-0.5% of C in addition to the components described in the fourth method.

[0015] In other words, the additively manufactured body is characterized by being a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, and C: 0.01-0.5%, with the remainder being Ni and unavoidable impurities, as described in any one of the first to third means.

[0016] The sixth method is a laminated body characterized by containing an additional 0.1-10.0% of W in addition to the components described in the fourth or fifth method.

[0017] That is, in terms of mass percentage, it contains Cr: 17.0 to 25.0%, Mo: 13.0 to 22.0%, Al: 0 to 3.0%, Nb: 0 to 3.0%, and further contains at least one or more of C: 0.01 to 0.5% and W: 0.1 to 10.0% as selectively added components, with the balance consisting of Ni and inevitable impurities, and is a laminated formed body formed by using NiCrMo-based alloy powder, and is the laminated formed body according to any one of the first to third means.

[0018] The seventh means is a laminated formed body characterized by further containing Fe: 0.1 to 8.0% in addition to the components described in any one of the fourth to sixth means.

[0019] That is, in terms of mass percentage, it contains Cr: 17.0 to 25.0%, Mo: 13.0 to 22.0%, Al: 0 to 3.0%, Nb: 0 to 3.0%, and further contains at least one or more of C: 0.01 to 0.5%, W: 0.1 to 10.0%, and Fe: 0.1 to 8.0% as selectively added components, with the balance consisting of Ni and inevitable impurities, and is a laminated formed body formed by using NiCrMo-based alloy powder, and is the laminated formed body according to any one of the first to third means.

[0020] The eighth means is a laminated formed body characterized by further containing Cu: 0.1 to 6.0% in addition to the components described in any one of the fourth to seventh means.

[0021] That is, in terms of mass percentage, it contains Cr: 17.0 to 25.0%, Mo: 13.0 to 22.0%, Al: 0 to 3.0%, Nb: 0 to 3.0%, and further contains at least one or more of C: 0.01 to 0.5%, W: 0.1 to 10.0%, Fe: 0.1 to 8.0%, and Cu: 0.1 to 6.0% as selectively added components, with the balance consisting of Ni and inevitable impurities, and is a laminated formed body formed by using NiCrMo-based alloy powder, and is the laminated formed body according to any one of the first to third means.

Advantages of the Invention

[0022] According to the means of the present invention, a metal laminated body of a NiCrMo-based alloy with high corrosion resistance and high hardness can be obtained. According to the means of the present invention, a shaped body with a hardness of 37 HRC or more and a hydrofluoric acid corrosion resistance of 1.00 or less can be obtained.

Brief Description of the Drawings

[0023] [Figure 1] The image in Fig. 1 is a TEM image using a transmission electron microscope (TEM) showing the P phase of the structure obtained by subjecting the laminated body using the NiCrMo-based alloy powder of the present invention to solution treatment at 1150 °C and then aging treatment at 750 °C. [Figure 2] The image in Fig. 2 is a backscattered electron image of a scanning electron microscope (SEM) of the structure obtained by subjecting the laminated body using the NiCrMo-based alloy powder of the present invention to solution treatment at 1150 °C and then aging treatment at 650 °C. The white part is mainly a coarse compound of Mo. [Figure 3] The image in Fig. 3 is a backscattered electron image of a SEM of the structure obtained by subjecting the laminated body using the NiCrMo-based alloy powder of the present invention to aging treatment at 650 °C without solution treatment. [Figure 4] It is a graph showing the relationship between the presence or absence of solution treatment, aging temperature, and the major axis length of the P phase in the examples and comparative examples. [Figure 5] It is a graph showing the relationship between the presence or absence of solution treatment, the major axis length of the P phase, and the hydrofluoric acid corrosion resistance in the examples and comparative examples. <00001'09> [Figure 6] It is a graph showing the relationship between the presence or absence of solution treatment, aging temperature, and hardness in the examples and comparative examples. [Figure 7] It is a graph showing the relationship between the presence or absence of solution treatment, the major axis length of the P phase, and hardness in the examples and comparative examples. [Figure 8] It is a graph showing the relationship between the presence or absence of solution treatment, aging temperature, and the area ratio of Mo compounds in the examples and comparative examples. [Figure 9] It 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 the examples and comparative examples.

Embodiments for Carrying Out the Invention

[0024] Prior to describing 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 remainder consists of Ni and unavoidable impurities. The percentages of the chemical components are given in mass percentages.

[0025] Mo: 13.0~22.0% Mo dissolves in the base material Ni and contributes to the corrosion resistance of the alloy. Mo particularly contributes to corrosion resistance to non-oxidizing acids. When the base material containing Mo 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 viewpoints, the Mo content should be 13.0% or more, preferably 14.0% or more, and more preferably 15.0% or more. On the other hand, if the amount of Mo is excessive, the cost will increase. Therefore, from a cost standpoint, the amount of Mo should be 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. In addition, Cr is resistant to various acids. This contributes to corrosion resistance. Cr may be present in the Mo compound phase precipitated by solution treatment and aging treatment, and this Mo compound phase has high hardness. From the viewpoint of ensuring that a Mo compound phase with sufficient Cr precipitates and that sufficient Cr is present in the matrix after the 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 cost reduction, the Cr content is set to 25.0% or less, preferably 24.0% or less, and more preferably 23.0% or less.

[0027] Al: 0-3.0% Al dissolves in the base material Ni, and when the Al-containing matrix is ​​subjected to solution treatment and aging treatment, a large number of γ' phases (Ni3Al phases) precipitate and disperse in the matrix. Alloys having these γ' phases have high hardness. Therefore, up to 3.0% of Al can be added to the NiCrMo 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: 0~3.0% 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. Nb further dissolves in the γ' phase through substitution with Al, forming the Ni3(Al,Nb) phase. This γ' phase hardens through aging treatment. Therefore, up to 3.0% of Nb can be added to the NiCrMo alloy of the present invention. From the viewpoint of precipitation of the γ' phase, the Nb content is preferably 0.2-2.5%, more preferably 0.5-2.0%, and even more preferably 0.5-1.2%.

[0029] The following describes C, W, Fe, and Cu, which may be optionally added to the present invention.

[0030] C: 0.01~0.5% Carbon (C) is an element that contributes to carbide formation and has the effect of improving hardness. From this viewpoint, when C is added, it 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 the amount of C needs to 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: 0.1~10.0% Although W functions similarly to Mo, using W can sometimes improve corrosion resistance. Therefore, when adding W, the amount 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 a cost standpoint, the amount of W is preferably 9.0% or less, more preferably 8.0% or less, and even more preferably 7.0% or less.

[0032] Fe: 0.1~8.0% Fe can be added for cost reduction purposes. Preferably, the amount of 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, the amount of Fe is preferably 7.0% or less, more preferably 6.0% or less, and even more preferably 5.0% or less.

[0033] Cu: 0.1~6.0% Cu can improve corrosion resistance to hydrofluoric acid. From this viewpoint, the amount of Cu 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 amount of Cu is preferably 5.0% or less, more preferably 4.5% or less, and even more preferably 4.0% or less.

[0034] The additively manufactured NiCrMo alloy body according to the present invention is produced by metal additive manufacturing using a NiCrMo alloy as the material. After solution treatment of the additively manufactured body, an additively manufactured body containing the P phase can be obtained by aging treatment. Note that the solution treatment before aging can be omitted. Details are described below.

[0035] [Powder] The NiCrMo-based alloy powder used in this invention is preferably a gas atomized powder that is easily formed into a spherical shape from the viewpoint of fluidity and packing properties. Furthermore, the average particle size of the NiCrMo-based alloy powder is preferably 10 μm or more and 100 μm or less on a volume average basis.

[0036] [molding] One method for fabricating a molded object is a rapid melting and quenching solidification process, which involves melting and solidifying metal powder. Specific examples of this process include three-dimensional additive manufacturing, thermal spraying, laser coating, and cladding. In particular, the NiCrMo alloy powder of the present invention is suitable for powder bed fusion bonding three-dimensional additive manufacturing, enabling the formation of large-sized molded objects at high density.

[0037] Three-dimensional additive manufacturing can be achieved using methods such as 3D printers. Generally, there are two main methods: powder bed fusion (PBL) and directed energy deposition (DBL). 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, creating a thin, uniform layer of powder. Then, a heat source is applied to the desired areas within the additive manufacturing unit to selectively melt and form the object. In the deposition method, metal powder is supplied while a laser is irradiated to deposit molten metal, and the object is built up by moving the nozzle in three dimensions.

[0038] For example, in the powder bed method, when a laser beam or electron beam is irradiated onto the NiCrMo-based gold powder of the present invention, which is spread out, the particles are rapidly heated and rapidly melted, and the molten particles then rapidly solidify. Through this melting and solidification, the particles bond together. Since the beam irradiation is selectively applied to a portion of the spread out NiCrMo-based alloy powder, the parts of the spread out powder that are not irradiated with the beam do not melt, and a bonding layer is formed only in the parts that are irradiated with the beam due to rapid melting and rapid solidification.

[0039] A thin layer of NiCrMo alloy powder is then spread over 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. The melted particles 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] Through repeated irradiation and bonding, an aggregate of bonded layers gradually grows. This growth results in a fabricated object with the desired three-dimensional shape. This additive manufacturing method makes it easy to obtain objects with complex shapes.

[0041] [Heat treatment] When additive manufacturing using NiCrMo-based alloy powder, instead of using the formed unheat-treated body as is, a body containing the P phase can be obtained by solution treatment followed by aging treatment of the unheat-treated body (hereinafter, the solution-treated and aged body will also be referred to as "STA"). Note that the solution treatment before aging can be omitted (hereinafter, the directly aged body will also be referred to as "DA").

[0042] 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 1100°C or higher, and even more preferably at 1150°C or higher.

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

[0044] [Regarding the P phase in NiCrMo alloys] The P phase of this invention refers to a NiCrMo-based compound (Cr9Mo 21 Ni 20 These are needle-shaped precipitates, appearing as a black area 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 electron diffraction pattern of the TEM.

[0045] Furthermore, this P phase was not observed in the melted material described in Patent Document 2, and is a compound that precipitates during the aging treatment of rapidly cooled and solidified metal additively manufactured bodies. In other words, in the additively manufactured bodies of the present invention, Mo undergoes fine solidification segregation due to rapid cooling and solidification. The P phase precipitates from the fine segregation of Mo, and it is thought that the fine segregation structure characteristic of additive manufacturing is the cause of the precipitation of the P phase.

[0046] It should be noted that Patent Document 3, which concerns a NiCrMo alloy with a different chemical composition from the present invention, utilizes the precipitation of Ni2(Cr,Mo) instead of the P phase, and is therefore different.

[0047] [Regarding the morphology of the P phase] The morphology of the P phase can be controlled by heat treatment. When coarse P phase with a major axis exceeding 1000 nm precipitates, the area ratio of Cr and Mo-deficient phases near the precipitate increases compared to the case of fine P phase precipitation, worsening 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 finer P phase increases the amount of precipitation strengthening, thereby increasing 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] [Method for calculating the major axis of the P phase] TEM images are taken at five locations within a 5 μm × 5 μm area. The shape of the needle-like P-phase contained in these images is evaluated by image analysis to determine its major axis, and the average of the obtained major axes is calculated to determine the major axis of the P-phase.

[0049] [Regarding the area ratio of coarse molybdenum compounds] When solution treatment is performed, coarse Mo-based compounds on a μm scale precipitate, as shown in Figure 2. These coarse Mo-based compounds on a μm scale are different compounds from the nanometer-scale P phase. Since solution treatment is always performed on NiCrMo alloys used as melting materials, it is virtually impossible to obtain a microstructure that does not contain coarse Mo compounds through direct aging treatment without using metal additive manufacturing. From these viewpoints, the area percentage of coarse Mo compounds is preferably 5% or less, more preferably 3% or less, and even more preferably 1% or less.

[0050] [Method for calculating the area ratio of coarse molybdenum compounds] In this invention, a coarse compound refers to a compound with an area of ​​1 μm². 2 These are defined as Mo-based compounds. Coarse Mo compounds can be identified based on the white areas in their SEM backscattered electron images, as shown in Figure 2, and their values ​​can be calculated using image analysis software. Specifically, five fields of view are captured at a magnification of 4000x, and the average of the values ​​calculated by the image analysis software is evaluated as the area ratio.

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

[0052] [Table 1]

[0053] [molding] Using the NiCrMo alloy powders listed in Table 1 as raw materials, 10 × 10 × 15 mm blocks were fabricated using additive manufacturing with a 3D additive manufacturing system (EOS-M280) to produce test specimens for hardness and corrosion resistance evaluation. The fabrication conditions used were the standard device parameter IN718 (layer thickness 40 μm), which is the condition recommended by EOS Corporation as suitable for fabrication with the EOS-M280.

[0054] [Heat treatment] Tables 2 and 3 show the heat treatment conditions for the examples and comparative examples. The solution treatment temperature and the aging treatment temperature are shown in Tables 2 and 3. For the solution treatment, the material was held at the solution treatment temperature for 4 hours and then air-cooled. For the aging treatment, the material was held at the aging treatment temperature for 16 hours and then air-cooled. All heat treatments were performed in an atmospheric environment.

[0055] [Table 2]

[0056] [Table 3]

[0057] [Hardness measurement] A 10 x 10 x 15 mm block was heat-treated, then cut at a height of 7.5 mm, and the Rockwell hardness was measured on the cut surface. Hardness ≥ 37 HRC was evaluated as good, and the results are shown in Tables 2 and 3. Underlined text indicates that the results fell outside the evaluation criteria.

[0058] [Measurement of hydrofluoric acid corrosion resistance] A 10 x 10 x 15 mm block was heat-treated and then polished to a high surface. This test specimen was immersed in a 10% hydrofluoric acid aqueous solution for 10 hours. The temperature of this aqueous solution was 40°C. Furthermore, the mass loss of the test specimen was measured, and the corrosion resistance was evaluated from the surface area. Hydrofluoric acid corrosion resistance ≤ 1.00 was evaluated as good, and the results are shown in Tables 2 and 3. Underlined values ​​indicate that the evaluation criteria were not met.

[0059] The additively fabricated bodies produced using the NiCrMo-based alloy powder of the present invention exhibited a hardness of 37 HRC or higher and hydrofluoric acid corrosion resistance of 1.00 or lower in the examples, meeting the criteria for both hardness and corrosion resistance.

[0060] On the other hand, the comparative examples showed poor corrosion resistance, such as hydrofluoric acid corrosion resistance exceeding 1.00, or hardness below 37 HRC, indicating insufficient corrosion resistance or hardness. In Comparative Example 1, the aging temperature is too high, resulting in a larger major axis of the P phase and poor corrosion resistance. Comparative Example 2, which underwent solution treatment, had an excessively high aging temperature, resulting in a larger major axis of the P phase and poor corrosion resistance. In Comparative Example 3, the aging temperature was too low, resulting in no precipitation of the P phase, and the hardness that should have been obtained through precipitation by aging treatment was lower than in the Examples. [Industrial applicability]

[0061] The additively fabricated body using the NiCrMo alloy of the present invention can be suitably applied to various products requiring high corrosion resistance and high hardness.

Claims

1. A laminated body formed from a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, with the remainder being Ni and unavoidable impurities, wherein the laminated body contains a P phase in its constituent phases.

2. A laminated body formed from a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, and C: 0.01-0.5%, with the remainder being Ni and unavoidable impurities, wherein the laminated body contains a P phase in its constituent phases.

3. A laminated body formed from a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, and further containing at least one of C: 0.01-0.5% and W: 0.1-10.0% as selective additional components, with the remainder being Ni and unavoidable impurities, wherein the laminated body contains a P phase in its constituent phases.

4. A laminated body formed from a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, and further containing at least one of C: 0.01-0.5%, W: 0.1-10.0%, and Fe: 0.1-8.0% as a selective additional component, with the remainder being Ni and unavoidable impurities, wherein the laminated body contains a P phase in its constituent phases.

5. A laminated body formed from a NiCrMo alloy powder containing, by mass%, Cr: 17.0-25.0%, Mo: 13.0-22.0%, Al: 0-3.0%, Nb: 0-3.0%, and further containing at least one of C: 0.01-0.5%, W: 0.1-10.0%, Fe: 0.1-8.0%, and Cu: 0.1-6.0% as a selective additional component, with the remainder being Ni and unavoidable impurities, wherein the laminated body contains a P phase in its constituent phases. 。

6. The additively fabricated body according to any one of claims 1 to 5, wherein the P phase in the constituent phase has a major axis of 1000 nm or less.

7. Area is 1 μm 2 The additively fabricated body according to any one of claims 1 to 5, wherein the area ratio of the coarse Mo compound phase is 7% or less.

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