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0.1 M HCl이 포함된 아임계수 및 초임계수 용액에서 Alloy 625의 부식거동
이규환 ( Kyu Hwan Lee ),이무중 ( Moo Joong Lee ),장도연 ( Do Yon Chang ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.7
Corrosion tests of alloy 625 in subcritical- and supercritical water containing 0.1 M HCI were performed in the range of temperature of 350℃~450℃ at 25 MPa. The corrosion rate of alloy 625 was faster in sub critical water than in supercritical water. 0.1 M of hydrogen peroxide seemed critical concentration of oxidizer that accelerated the corrosion rate of alloy 625. Below 0.1 M of hydrogen peroxide, corrosion rate was not influenced, however, over 0.1 M, corrosion rate was increased rapidly with increasing the hydrogen peroxide. Alloy 625 had two corroded layers. Intermediate layer was the porous structure layer in which Ni and/or Fe were dissolved out selectively. The outer layer was a powder-like porous oxide layer mainly composed with chromium oxide. It was found that the main corrosion mechanisms of alloy 625 were selective dissolution of nickel and iron under the subcritical water and selective dissolution of nickel under the highly oxidized supercritical water condition.
에너지 전자상태 계산으로 도출된 이론값을 이용한 니켈 합금 설계
백민숙,강법성,백경철,김병일,윤동주,Baek, Min-Sook,Kang, Pub-Sung,Baek, Kyeong-Cheol,Kim, Byung-Il,Yoon, Dong-Joo 한국재료학회 2015 한국재료학회지 Vol.25 No.11
Super alloys, which can be divided into three categories, i.e. Ni-base, Co-base, and Fe-base alloys, are widely used for high temperature applications. Since superalloys contain many alloying elements and precipitates, their chemistry and processing parameters need to be carefully designed. In this study, we designed a new Ni alloy to prevent corrosion due to water vapor and gases at high temperatures. The new alloy was designed using the theoretical value of the resulting energy electronic state calculation($DV-X{\alpha}$ method). The components that were finally used were Cr, Mo, and Ti, with Ni as a base. For these alloys, elements were selected in order to compare their values with that of the average theoretical basis for an Inconel 625 alloy. Finally, two kinds of Ni alloy were designed: Ni-28Cr-4Mo-2Ti and Ni-20Cr-10Mo-1Ti.
Alloy 625의 특성과 조직에 미치는 원심주조품 두께의 영향
이유정,김병훈,주윤곤,조창용,이재현 한국주조공학회 2022 한국주조공학회지 Vol.42 No.3
The effect of thickness on the microstructure and the mechanical properties of centrifugal cast 625 was investigated. Centrifugal cast 625 with various thickness of 10, 17 and 50mm showed partially columnar grained structure 8, 12.3 and 18.5mm respectively from the outer surface. Secondary dendrite arm spacing in the columnar grains slightly increased with increasing casting thickness. Tensile strength of the columnar region was similar regardless of casting thickness. Solidification behavior of the columnar grained region is similar to that of directional solidification, thus solidification rate in the centrifugal cast tube was extrapolated from the secondary dendrite arm spacing data of the directionally solidified material. The equiax grained region formed interior of the thick castings. The tensile strength of the equiaxed region showed the average value of the columnar region which is presumably orig- inated from the grain structure rather than secondary dendrite arm spacing. 초내열합금 625 튜브의 제조에 필요한 원심주조품의 두께에 따라 응고조직과 기계적 특성에 미치는 영향을 고찰하였다 . 10, 17, 50 mm 두께로 원심주조한 625합금에서 두께의 증가에 따라 주상정 부분의 길이와 2차 수지상 간격이 약간 증가하였으나 상 온 인장특성은 큰 차이를 보이지 않았다 . 주상정 부분의 응고는 일방향응고의 형태로 응고가 진행되기 때문에 일방향응고 조건을 변화시켜 2차 수지상의 간격을 비교하여 각 두께의 주조품에서 응고속도를 계산하였다 . 두꺼운 주조품일수록 내부 다결정 조직의 비율이 증가하였다 . 다결정 부분의 인장특성은 주상정 부분의 평균값과 유사한 값을 보였으며 이는 2차 수지상의 간격보다 결정립 형태의 영향인 것으로 사료된다.
9% Ni강의 Alloy 625 용접재료 적용에서 GTAW와 FCAW의 고온균열 발생 특성 비교
나기범,이창익,박정현,조상명 대한용접접합학회 2019 대한용접·접합학회지 Vol.37 No.4
Recently, demand for LNG storage and fuel tanks has been increasing due to the International Maritime Organization(IMO) regulations on sulfur oxides and greenhouse gas emission. In the production of LNG tanks, 9% Ni steel is used and Alloy 625 or Hastelloy wire are used as the filler materials. In the FCAW welding process using Alloy 625 consumables, when using high current to increase productivity, hot cracking frequently occurs as well as welding defects such as lack of fusion due to arc instability. In this study, the hot cracking characteristics of FCAW and GTAW using Alloy 625 consumables in 9% Ni steel welding were compared through the FISCO hot cracking test.
High-speed milling of Inconel 625 alloy using carbide ball end mills
Kazumasa Kawasaki 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
Inconel 625 alloy has advantageous properties, such as heat resistance and corrosion resistance, which make it a suitable material in aerospace, energy, and marine industries. However, it is also difficult-to-machine because of factors such as work hardening, low thermal conductivity, and high tool affinity. Therefore, the problems of tool wear, chipping, and adhesion often occur in milling of Inconel 625 alloy using end mills. We conducted experiments on the cutting of Inconel 625 alloy by high-speed milling using carbide ball end mills to investigate the tool wear, chipping, and adhesion under three spindle revolution speeds and two feed rates, and determine the optimal cutting conditions. The effects of spindle revolution speed on the tool and workpiece were clarified, and the optimal speed was established to achieve long tool life.
배중탁,김한주 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
An ultra-precision magnetic abrasive finishing (UPMAF) process is an efficient mirror finishing technique. This research utilized the ultra-precision magnetic abrasive finishing technique to improve the accuracy of advanced material of Inconel alloy 625 cylindrical bars. The finishing technique employed flexible unbonded magnetic abrasive tools with neodymium permanent magnets (Nd-Fe-B), and components of the finishing procedure were installed with a five-dimensional computer numerical control (CNC) machining center. The surface accuracy and dimensional accuracy of Inconel alloy 625 bars were enhanced by the ultra-precision magnetic abrasive finishing technique with input parameters of workpiece rotational speed, workpiece feed rate, and magnetic abrasive grain size. After characterization with energy dispersive X-ray analysis (EDX), atomic force microscope (AFM), and a thermal imaging camera, we found that this ultra-precision magnetic polishing technology can improve surface roughness Ry of Inconel alloy 625 cylindrical bars from 2010 nm to 200 nm at a rotational speed of 12000 rpm, feed rate of 2000 mm/min, diamond abrasive grain size of 1 μm, and flux density of 300 mT processing of 5 min.
신용택(Yong-Taek Shin) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.5
Nickel alloy, especially Alloy 625, is used widely in industrial applications such as aerospace, chemical, petrochemical and marine applications due to their good mechanical properties, excellent fabricability, weldability and good corrosion resistance. Especially, it is obviously applied in FPSO’s moon pool structure and caisson tubular of CPF under seawater environment. Recently, UNS S32654 was developed to substitute alloy 625 because of high cost price. In this study, mechanical properties and corrossive properties of UNS S32654 are reviewed and proposed its applications.