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US-12618121-B2 - Additive manufacturing wire, additively-manufactured object, and additive manufacturing method

US12618121B2US 12618121 B2US12618121 B2US 12618121B2US-12618121-B2

Abstract

The present invention relates to an additive manufacturing wire, containing, in terms of % by mass, 0%<Si≤2.0%, 0%<Mn≤6.0%, 3.0%≤Ni≤15.0%, 20.0%≤Cr≤30.0%, 1.0%≤Mo≤5.0%, 0%<N≤0.50%, with a balance being Fe and unavoidable impurities, in which C≤0.10% is satisfied, and 27<A<67 is satisfied, when Cr eq is defined as Cr+Mo+1.5Si+0.5(Nb+W)+2(Ti+Al), Ni eq is defined as Ni+30C+20N+0.5(Mn+Cu+Co), and A is defined as −16.2+6.3Cr eq −9.3Ni eq , here, in the definition of Cr eq and Ni eq , each element symbol indicates a content of the each element in units of % by mass.

Inventors

  • Masakazu Yamashita
  • Kazuki Tachi
  • Mototsugu Osaki

Assignees

  • DAIDO STEEL CO., LTD.

Dates

Publication Date
20260505
Application Date
20221230
Priority Date
20220111

Claims (9)

  1. 1 . An additive manufacturing wire, consisting of, in terms of % by mass, 0%<Si≤2.0%, 0%<Mn≤6.0%, 3.0%≤Ni≤15.0%, 20.0%≤Cr≤30.0%, 1.0%≤Mo≤5.0%, and 0%<N≤0.50%, and at least one selected from the group consisting of: 0.01%≤Cu≤6.0%, 0%<Co≤5.0%, 0%<Al≤0.30%, 0%<Ti≤0.50%, 0%<Nb≤4.0%, and 0%<Mg≤0.0050%, with a balance being Fe and unavoidable impurities, wherein C≤0.10% is satisfied, 50.1<A<67 is satisfied, when Cr eq is defined as Cr+Mo+1.5Si+0.5(Nb+W)+2 (Ti+Al), Ni eq is defined as Ni+30C+20N+0.5(Mn+Cu+Co), and A is defined as −16.2+6.3Cr eq −9.3Ni eq , here, in the definition of Cr eq and Ni eq , each element symbol indicates a content of the each element in units of % by mass, and wherein the additive manufacturing wire is a solid wire or a metal-cored wire.
  2. 2 . The additive manufacturing wire according to claim 1 , further satisfying, in terms of % by mass, at least one selected from the group consisting of: 0.03%≤Cu≤6.0%, 0.3%≤Co≤5.0%, 0.02%<Al≤0.30%, 0.02%<Ti≤0.50%, 0.10%<Nb≤4.0%, and 0.0010%≤Mg≤0.0050%.
  3. 3 . The additive manufacturing wire according to claim 1 , wherein when an additively-manufactured object is manufactured in a condition that a slowest cooling rate in a temperature range between 1,200° C. and 800° C. is 10° C./s or more and 140° C./s or less, the additively-manufactured object has a ferrite content of 30% by volume or more and 70% by volume or less.
  4. 4 . The additive manufacturing wire according to claim 2 , wherein when an additively-manufactured object is manufactured in a condition that a slowest cooling rate in a temperature range between 1,200° C. and 800° C. is 10° C./s or more and 140° C./s or less, the additively-manufactured object has a ferrite content of 30% by volume or more and 70% by volume or less.
  5. 5 . The additive manufacturing wire according to claim 1 , satisfying a relationship of CPT/PREN≥0.7, when PREN that is a pitting resistance equivalent number is calculated as PREN=Cr+3.3 (Mo+0.5W)+16N and CPT is defined as a critical pitting temperature of an additively-manufactured object that is manufactured in a condition that a slowest cooling rate in a temperature range between 1,200° C. and 800° C. is 10° C./s or more and 140° C./s or less, here in the definitional equation of PREN, each element symbol indicates a content of the each element in units of % by mass.
  6. 6 . The additive manufacturing wire according to claim 2 , satisfying a relationship of CPT/PREN≥0.7, when PREN that is a pitting resistance equivalent number is calculated as PREN=Cr+3.3 (Mo+0.5W)+16N and CPT is defined as a critical pitting temperature of an additively-manufactured object that is manufactured in a condition that a slowest cooling rate in a temperature range between 1,200° C. and 800° C. is 10° C./s or more and 140° C./s or less, here in the definitional equation of PREN, each element symbol indicates a content of the each element in units of % by mass.
  7. 7 . The additive manufacturing wire according to claim 1 , further comprising a coating layer made of Cu or a Cu alloy on an outer periphery thereof.
  8. 8 . The additive manufacturing wire according to claim 2 , further comprising a coating layer made of Cu or a Cu alloy on an outer periphery thereof.
  9. 9 . An additive manufacturing wire, comprising, in terms of % by mass, 0%<Si≤2.0%, 0%<Mn≤6.0%, 3.0%≤Ni≤15.0%, 20.0%≤Cr≤30.0%, 1.0%≤Mo≤5.0%, and 0%<N≤0.50%, with a balance being Fe and unavoidable impurities, wherein C≤0.10% is satisfied, 50.1≤A<67 is satisfied, when Cr eq is defined as Cr+Mo+1.5Si+0.5(Nb+W)+2 (Ti+Al), Ni eq is defined as Ni+30C+20N+0.5(Mn+Cu+Co), and A is defined as −16.2+6.3Cr eq −9.3Ni eq , here, in the definition of Cr eq and Ni eq , each element symbol indicates a content of the each element in units of % by mass, and wherein the additive manufacturing wire is a solid wire or a metal-cored wire.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2022-002134 filed on Jan. 11, 2022 and Japanese Patent Application No. 2022-168584 filed on Oct. 20, 2022, the contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to an additive manufacturing wire, an additively-manufactured object, and an additive manufacturing method, and more particularly to an additive manufacturing wire used for additive manufacturing of metal, an additively-manufactured object manufactured by using the additive manufacturing wire, and an additive manufacturing method using the additive manufacturing wire. BACKGROUND ART As a new technique for manufacturing a three-dimensional structure, an additive manufacturing technique has recently been remarkably developed. Typical examples of the additive manufacturing technique using a metal material include a technique using a metal powder and a technique using a metal wire. In the additive manufacturing using a metal wire, a desired shape is formed by three-dimensionally laminating layers formed by melting the metal wire with an arc or laser beam and solidifying the melt. As a metal wire for additive manufacturing, a metal wire made of a stainless steel is often used. A component composition of the wire made of a stainless steel for additive manufacturing is being studied from the viewpoint of obtaining desired properties such as mechanical strength in the obtained additively-manufactured object. For example, Patent Literature 1 below discloses a metal wire for welding additive manufacturing that can stably obtain a substantially austenite single phase during welding. In addition, Patent Literature 2 discloses a metal wire for welding additive manufacturing, whose composition is adjusted such that a martensite structure always appears. Patent Literature 1: JP2020-164882APatent Literature 2: JP2020-147785A SUMMARY OF INVENTION When additive manufacturing is performed by using a metal wire made of a stainless steel, properties of the obtained additively-manufactured object are highly dependent on a state of a metal structure in the additively-manufactured object. Therefore, in the additively-manufactured object, it is important to control the metal structure from the viewpoint of obtaining desired properties. A component composition of the metal wire is set from the viewpoint of obtaining an austenite single phase in Patent Literature 1 and from the viewpoint of obtaining a martensite structure in Patent Literature 2. In addition, it is also being studied to use a wire made of a duplex stainless steel for additive manufacturing such that properties of the duplex stainless steel such as pitting corrosion resistance and high strength are exhibited in the additively-manufactured object. However, even in the case where a duplex stainless steel is used as a metal wire that is a raw material for additive manufacturing, in an additive manufacturing process, a phase ratio between an austenite phase and a ferrite phase is changed under the influence of thermal history such as heating and cooling, making it difficult to obtain a desired metal structure and properties. In particular, additive manufacturing tends to result in excessive austenite structures, and pitting corrosion resistance of the additively-manufactured object tends to be lowered. Although the phase ratio between the austenite phase and the ferrite phase can be adjusted by heating the obtained additively-manufactured object, normally, adjustment of the phase ratio requires a heat treatment at 1,350° C. or higher, which is poor in industrial practicality. A problem to be solved by the present invention is to provide an additive manufacturing wire that can provide an additively-manufactured object made of a duplex stainless steel containing an austenite phase and a ferrite phase in a well-balanced manner when additive manufacturing is performed, an additively-manufactured object manufactured by using such an additive manufacturing wire, and an additive manufacturing method using such an additive manufacturing wire. [1] In order to solve the above problem, an additive manufacturing wire according to the present disclosure contains, in terms of % by mass, 0%<Si≤2.0%, 0%<Mn≤6.0%, 3.0%≤Ni≤15.0%, 20.0%≤Cr≤30.0%, 1.0%≤Mo≤5.0%, 0%<N≤0.50%, with a balance being Fe and unavoidable impurities, in which C≤0.10% is satisfied, and 27<A<67 is satisfied, when Creq is defined as Cr+Mo+1.5Si+0.5(Nb+W)+2(Ti+Al), Nieq is defined as Ni+30C+20N+0.5(Mn+Cu+Co), and A is defined as −16.2+6.3Creq−9.3Nieq, here, in the definition of Creq and Nieq, each element symbol indicates a content of the each element in units of % by mass. [2] In the above aspect of [1], it is preferable that the additive manufacturing wire further contains, in terms of % by mass, at least one selected from the group consisting of 0.01%≤Cu≤6.0%, 0%<Co≤5.0%