KR101571825B1 - CORED WIRE Ni-Cr BASED SUPERALLOY BY BORIDE - Google Patents
CORED WIRE Ni-Cr BASED SUPERALLOY BY BORIDE Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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Abstract
본 발명은 용사 또는 용접용 코어드 와이어(cored wire)에 관한 것으로, 보다 상세하게는 고온내식성을 유지하면서도 기계적 특성이 향상된 붕소 강화 니켈계 초합금 코어드 와이어에 관한 것이다.
본 발명은 코어용 분말과, 상기 코어용 분말을 둘러싼 외피로 구성되는 코어드 와이어에 있어서, 상기 코어드 와이어는 전체 중량에 대하여 크롬(Cr) 35.0~50.0 중량%, 붕소(B) 0.5~3.5 중량%, 티타늄(Ti) 0.5~3.0 중량%, 실리콘(Si) 1.5~5.5 중량%, 나머지 중량의 니켈(Ni)로 이루어진 것을 특징으로 한다.The present invention relates to a cored wire for spraying or welding, and more particularly to a boron-enhanced nickel-base superalloy cored wire having improved mechanical properties while maintaining high temperature corrosion resistance.
The present invention relates to a core wire comprising a core powder and an outer envelope surrounding the core powder, wherein the core wire comprises 35.0 to 50.0 wt% of chromium (Cr), 0.5 to 3.5 wt% of boron (B) 0.5 to 3.0% by weight of titanium (Ti), 1.5 to 5.5% by weight of silicon (Si), and nickel (Ni) of the remaining weight.
Description
본 발명은 용사 또는 용접용 코어드 와이어(cored wire)에 관한 것으로, 보다 상세하게는 고온내식성을 유지하면서도 기계적 특성이 향상된 붕소 강화 니켈계 초합금 코어드 와이어에 관한 것이다.
The present invention relates to a cored wire for spraying or welding, and more particularly to a boron-enhanced nickel-base superalloy cored wire having improved mechanical properties while maintaining high temperature corrosion resistance.
일반적으로 코어드 와이어는 도1에 도시된 바와 같이, 코어용 분말(3)과, 상기 코어용 분말(3)을 둘러싼 외피(2)로 구성되어 있다. 이러한 코어드 와이어는, 가혹한 마모 환경이나 황산 펌프 부품 등 부식성 조건에서 사용되는 각종 기계부품의 수명 연장이나 손상 부위의 보수를 목적으로, 상기 부품 표면에 용사 또는 육성용접(hardfacing)을 행할 때 사용된다.In general, as shown in Fig. 1, a core wire is composed of a core powder 3 and a
그러나, 코어드 와이어는 고온 분위기에서 철합금으로 내식성을 유지하기에는 한계가 있다. 철합금의 한계를 초과하는 목적으로 사용되는 것이 니크롬선이라고 부르는 니켈-크롬계 선이다. 그러나 발전용 보일러의 수관같은 부품 표면을 보호하는 데는 경도상의 한계가 있어 그대로는 사용되지 않는다.However, the cored wire has a limitation in maintaining corrosion resistance with an iron alloy in a high temperature atmosphere. A nickel-chromium-based wire called nichrome wire is used for the purpose of exceeding the limit of the iron alloy. However, there is a hardness limit in protecting the surface of components, such as the water tubes of power generation boilers, so they are not used as they are.
특히, 고온 부식성 분위기인 보일러 노내에서는 다른 강화성분을 첨가하여 사용하고 있는데 그 대표적인 것이 미국의 Prax Air에서 판매하는 TAFA 45 CT 이다. 그러나 이 제품은 보일러 성능이 고도화되고 수관 재질이 발전하면서 내마모성에서의 한계점에 부딪쳐 문제를 일으켜 대체 코팅제의 개발이 요구되어 왔다
Especially, in the boiler furnace which is a high-temperature corrosive atmosphere, other reinforcing components are added and used. Typical examples thereof are TAFA 45 CT sold by Praxair of USA. However, this product has encountered limitations in abrasion resistance due to advanced boiler performance and development of water tube material, and it has been required to develop an alternative coating agent
본 발명이 해결하고자 하는 과제는 고온내식성을 유지하면서도 기계적 특성이 향상된 붕소 강화 니켈-크롬계 초합금 코어드 와이어를 제공하는 데 있다.
A problem to be solved by the present invention is to provide a boron-enriched nickel-chromium superalloy cored wire having improved mechanical properties while maintaining high temperature corrosion resistance.
본 발명은 코어용 분말과, 상기 코어용 분말을 둘러싼 외피로 구성되는 코어드 와이어에 있어서, 상기 코어드 와이어는 전체 중량에 대하여 크롬(Cr) 35.0~50.0 중량%, 붕소(B) 0.5~3.5 중량%, 티타늄(Ti) 0.5~3.0 중량%, 실리콘(Si) 1.5~5.5 중량%, 나머지 중량의 니켈(Ni)로 이루어진 것을 특징으로 한다.The present invention relates to a core wire comprising a core powder and an outer envelope surrounding the core powder, wherein the core wire comprises 35.0 to 50.0 wt% of chromium (Cr), 0.5 to 3.5 wt% of boron (B) 0.5 to 3.0% by weight of titanium (Ti), 1.5 to 5.5% by weight of silicon (Si), and nickel (Ni) of the remaining weight.
바람직하게, 코어드 와이어는 Fe, Mn, Mo, Al, Zn, Nb, Zr, C 및 이들의 혼합물 중의 하나인 활성첨가제 0.5~3.0 중량%를 더 포함하는 것을 특징으로 한다.Preferably, the core wire further comprises 0.5 to 3.0% by weight of an active additive which is one of Fe, Mn, Mo, Al, Zn, Nb, Zr, C and mixtures thereof.
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본 발명에 의해 제조된 코어드 와이어는 종래의 니켈계 코어드 와이어와 같은 고온내식성을 유지하면서도 경도를 향상시키는 현저한 효과가 있다.
The core wire produced by the present invention has a remarkable effect of improving the hardness while maintaining the high temperature corrosion resistance as in the conventional nickel-based core wire.
도 1은 일반적이 코어드 와이어의 단면도.
도 2는 본 발명의 일 실시예와, 비교예의 코어드 와이어의 동전위 분극시험을 통해 부식거동을 나타낸 그래프.BRIEF DESCRIPTION OF THE DRAWINGS Fig.
FIG. 2 is a graph showing corrosion behavior of a core wire according to an embodiment of the present invention and a comparative example through a co-electrification test. FIG.
본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되어 있는 실시 예들을 참조하면 명확해질 것이다. 그러나 본 발명은 이하에서 개시되는 실시 예들에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있으며, 단지 본 실시 예들은 본 발명의 개시가 완전하도록 하고, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명의 청구범위에 의해 한정된다.BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. And are intended to fully inform the person skilled in the art the scope of the invention and are defined by the claims of the invention.
본 발명의 실시 예를 설명함에 있어 이미 공지되어 있는 기능이나 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 그리고 후술되는 용어들은 본 발명의 실시예에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례 등에 따라 달라질 수 있다. 그러므로 그 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다.In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.
이하 본 발명의 구체적인 실시예에 따른 붕소 강화 니켈-크롬계 초합금 코어드 와이어를 설명한다.Hereinafter, a boron-reinforced nickel-chromium superalloy core wire according to a specific embodiment of the present invention will be described.
본 발명의 붕소 강화 니켈-크롬계 초합금 코어드 와이어는, 니켈(Ni), 크롬(Cr), 붕소(B), 티타늄(Ti), 실리콘(Si)을 포함하여 구성된다. 본 발명에 따른 코어드 와이어는 종래의 코어드 와이어에 비해 붕소(B)를 더 포함하며 그 성분 함량은 고온내식성을 유지하면서도 기계적 특성인 경도를 향상시킬 수 있도록 결정될 수 있다.The boron-doped nickel-chromium superalloy cored wire of the present invention comprises nickel (Ni), chrome (Cr), boron (B), titanium (Ti), and silicon (Si). The cored wire according to the present invention further comprises boron (B) as compared to conventional cored wire, and its component content can be determined so as to improve hardness which is a mechanical characteristic while maintaining high temperature corrosion resistance.
본 발명의 구체적인 일실시예의 코어드 와이어는 Ni이 주성분으로 전체 중량에 대하여 Cr 35.0~50.0 중량%, B 0.5~3.5 중량%, Ti 0.5~3.0 중량%, Si 1.5~5.5 중량%, 활성첨가제 0.5~3.0 중량%, 나머지 중량의 Ni로 혼합된다. 본 발명의 코어드 와이어를 구성하는 원소들의 특징을 살펴보면 다음과 같다. The core wire according to a specific embodiment of the present invention contains Ni as a main component in an amount of 35.0 to 50.0 wt% of Cr, 0.5 to 3.5 wt% of B, 0.5 to 3.0 wt% of Ti, 1.5 to 5.5 wt% of Si, To 3.0% by weight, and the remaining weight of Ni. The characteristics of the elements constituting the core wire of the present invention are as follows.
니켈(Ni)은 본 발명에 따른 합금을 형성하는 주 원소로써 고온내식성을 향상시키는 역할을 한다. 특히 크롬과 반응하여 초합금을 형성하는 주 원소이다.Nickel (Ni) serves as a main element for forming an alloy according to the present invention and serves to improve high temperature corrosion resistance. In particular, it is a main element that reacts with chromium to form superalloy.
크롬(Cr)은 니켈과 반응하여 초합금을 형성하고, 그 초합금은 고온내식성을 향상시키는 역할을 한다. 이러한 크롬은 전체 중량의 35~50 중량%의 함량비로 첨가되는 것이 바람직하다. 크롬이 35 중량% 미만으로 첨가될 경우, 상기의 크롬 첨가 효과를 충분히 발휘할 수 없으며, 50 중량%를 초과할 경우 크롬탄화물이 형성되어 기계적 특성을 악화시킬 우려가 있기 때문에 바람직하지 못하다.Chromium (Cr) reacts with nickel to form superalloys, and the superalloys serve to improve high temperature corrosion resistance. Such chromium is preferably added at a content ratio of 35 to 50% by weight of the total weight. When chromium is added in an amount of less than 35% by weight, the effect of adding chromium can not be sufficiently exhibited. If it exceeds 50% by weight, chromium carbide may be formed and mechanical properties may be deteriorated.
붕소(B)는 본 발명에 따른 초합금강의 기계적 특성을 향상시키는 결정하는 역할을 한다. 상기 붕소는 전체 중량의 0.5~3.5 중량%로 포함되는 것이 바람직하다. 붕소가 0.5 중량% 미만일 경우 상기의 첨가 효과를 얻을 수 없고, 3.5 중량%를 초과할 경우에는 붕화물이 다량 생성됨에 따라 내식성이 약화되고 취성이 증대되는 문제점이 있다.Boron (B) serves to determine the mechanical properties of the superalloy steel according to the present invention. The boron is preferably contained in an amount of 0.5 to 3.5% by weight based on the total weight. If the amount of boron is less than 0.5% by weight, the above-mentioned effect can not be obtained. If the amount of boron is more than 3.5% by weight, a large amount of boride is produced, which results in weak corrosion resistance and increased brittleness.
티타늄(Ti)은 본 발명에 따른 초합금강의 내산화성을 향상시키고, 산소 친화력이 높기 때문에 니켈과 크롬이 산화되어 소비되는 것을 방지하는 역할을 한다. 상기 티타늄은 전체 중량의 0.5~3.0 중량%로 첨가되는 것이 바람직하다. 티타늄이 0.5 중량% 미만으로 첨가될 경우 상기의 내산화성 향상 효과를 기대하기 어렵고, 3.0 중량%를 초과할 경우에는 초합금 형성을 방해하고, NixTiy 합금이 형성되어 기계적 특성을 기대하기 힘들다. Titanium (Ti) improves the oxidation resistance of the superalloy steel according to the present invention and plays a role of preventing nickel and chromium from being oxidized and consumed because of high oxygen affinity. The titanium is preferably added in an amount of 0.5 to 3.0 wt% of the total weight. When the amount of titanium is less than 0.5% by weight, the effect of improving the oxidation resistance can not be expected. If the amount of titanium exceeds 3.0% by weight, the formation of superalloy is inhibited and a Ni x Ti y alloy is formed.
실리콘(Si)은 본 발명에 따른 초합금강의 융점을 낮추어 용접성을 향상시키는 역할을 한다. 상기 실리콘은 전체 중량의 1.5~5.5 중량%로 첨가되는 것이 바람직하다. 실리콘이 1.5 중량% 미만으로 첨가될 경우 상기의 용접성 향상 효과를 기대하기 어렵고, 5.5 중량%를 초과할 경우에는 초합금 형성을 방해하여 기계적 특성을 기대하기 힘들다. Silicon (Si) serves to improve the weldability by lowering the melting point of the superalloy steel according to the present invention. The silicon is preferably added in an amount of 1.5 to 5.5 wt% of the total weight. When silicon is added in an amount of less than 1.5% by weight, it is difficult to expect the above-mentioned effect of improving the weldability. If it exceeds 5.5% by weight, mechanical properties are hardly expected due to hindering the formation of superalloy.
활성첨가제는 본 발명에 따른 초합금의 코팅 및 용접하는데 있어서 대기중 기체와 반응하여 초합금의 순도를 높이는 역할을 한다. 상기 활성첨가제는 Fe, Mn, Mo, Al, Zn, Nb, Zr, C 등이 사용될 수 있다. 활성첨가제는 전체 중량의 0.5~3.0 중량%로 첨가되는 것이 바람직하다. 활성첨가제가 0.5 중량% 미만으로 첨가될 경우 상기의 효과를 기대하기 힘들고, 3.0 중량%를 초과할 경우에는 초합금의 불순물이 많아져 특성 저하를 초래할 수 있다.The active additive reacts with atmospheric gases to enhance the purity of the superalloy in the coating and welding of superalloys according to the present invention. The active additive may be Fe, Mn, Mo, Al, Zn, Nb, Zr, C, or the like. The active additive is preferably added in an amount of 0.5 to 3.0 wt% of the total weight. If the active additive is added in an amount of less than 0.5% by weight, the above-mentioned effect can not be expected. If the additive is more than 3.0% by weight, impurities of the superalloy may increase and the properties may deteriorate.
본 발명의 코어드 와이어를 이용하여 아크용사 부착시키면 부착피막층의 비커스 경도가 약 540~730Hv 되는 고경도 피막을 얻을 수 있다.
When the cored wire of the present invention is used to apply arc spraying, a hard coat film having a Vickers hardness of about 540 to 730 Hv can be obtained.
이하에서는, 본 발명의 구체적인 실시예에 대해 설명한다.Hereinafter, a specific embodiment of the present invention will be described.
1. 시료의 제작1. Preparation of sample
본 발명의 특징을 설명하기 위하여, 아래 표 1과 같은 조성으로 혼합하여 본 발명의 코어드 와이어를 제조하여 기존의 45CT 와이어 함께 보일러수관표면에 시험 코팅하여 각 코팅층의 경도 및 내식성을 비교하여 설명한다. 아래 표 1에서 숫자는 각 성분의 함량비(중량%)를 나타낸다. In order to explain the characteristics of the present invention, the core wire of the present invention is manufactured by mixing the composition as shown in Table 1 below, and then the existing 45CT wire is tested and coated on the surface of the boiler water tube to compare the hardness and corrosion resistance of each coating layer . The numbers in Table 1 below represent the content ratio (wt%) of each component.
2. 경도 특성2. Hardness characteristics
표 1의 제조된 실시예와 비교예로 제조된 코어드 와이어를 이용하여 보일러 수관의 표면에 코팅 처리를 하여 합금층으로 이루어진 보일러 수관 보호 코팅층을 형성하였으며, 이 합금층에 대하여 비커스 경도를 측정한 결과를 표 2에 나타내었다. 표 2에서 숫자는 비커스 경도(Hv)를 나타낸다.
The surface of the boiler water pipe was coated with the cored wire manufactured in the manufactured example of Table 1 and the comparative example to form a boiler water protective coating layer made of an alloy layer. The Vickers hardness of the alloy layer was measured The results are shown in Table 2. The numbers in Table 2 represent Vickers hardness (Hv).
표 2에 나타난 바와 같이 본 발명의 실시예로 제조된 코어드 와이어는 비교예로 제조된 코어드 와이어 보다 약 2배 정도 경도 특성이 향상되었음을 확인할 수 있다.As shown in Table 2, it can be seen that the core wire manufactured according to the embodiment of the present invention has about twice the hardness characteristic as that of the core wire made by the comparative example.
3. 내식성(내산화성)3. Corrosion resistance (oxidation resistance)
표 1의 제조된 실시예와 비교예로 제조된 코어드 와이어를 이용하여 보일러 수관의 표면에 코팅 처리를 하여, 보일러 수관 보호 코팅층을 형성하고, 이 코팅된 보일러 수관을 3.5 중량% NaCl 수용액에 담근 후 수용액 내에서 동전위 분극시험을 통해 부식거동을 관찰하여 도 2의 그래프로 나타내었다.The surface of the boiler water pipe was coated with the cored wire manufactured in the manufactured example of Table 1 and the comparative example to form a boiler water pipe protective coating layer, and the coated boiler water pipe was dipped in a 3.5 wt% NaCl aqueous solution The corrosion behavior was observed through the co-electromotive force test in the aqueous solution, and it is shown in the graph of FIG.
도 2에서 알 수 있는 바와 같이, 동전위 분극 시험 결과 본 발명의 실시예의 부식 전위는 약 -5.5(V)이고, 비교예는 약 -0.7(V)인 것을 알 수 있다. 이와 같이 본 발명의 코어드 와이어는 비교예보다 내식성이 우수함을 알 수 있었다.As can be seen from FIG. 2, the corrosion potential of the embodiment of the present invention is about -5.5 (V) and the comparative example is about -0.7 (V). As described above, it was found that the cored wire of the present invention had better corrosion resistance than the comparative example.
Claims (4)
The method of claim 1, wherein the cored wire further comprises 0.5 to 3.0 wt.% Of an active additive that is one of Fe, Mn, Mo, Al, Zn, Nb, Zr, C, Based superalloy cored wire.
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| JP2006009052A (en) | 2004-06-22 | 2006-01-12 | Okano Valve Mfg Co | Corrosion prevention method |
| US20120267420A1 (en) * | 2011-03-23 | 2012-10-25 | Justin Lee Cheney | Fine grained ni-based alloys for resistance to stress corrosion cracking and methods for their design |
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| JP2006009052A (en) | 2004-06-22 | 2006-01-12 | Okano Valve Mfg Co | Corrosion prevention method |
| US20120267420A1 (en) * | 2011-03-23 | 2012-10-25 | Justin Lee Cheney | Fine grained ni-based alloys for resistance to stress corrosion cracking and methods for their design |
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