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Selection of Materials to Resist Failure
Published in Mahmoud M. Farag, Materials and Process Selection for Engineering Design, 2020
Inconel, 78/16/6 Ni−Cr−Fe, is resistant to many acids and has outstanding resistance to nitriding at high temperatures. Nimonic alloys, based on the 80/20 Ni−Cr basic composition, have particularly good combination of high strength and oxidation resistance at high temperatures. As shown in Table 4.10, Monel alloys, which are based on the 70/30 Ni−Cu composition, have similar resistance to pure nickel with the additional advantage of being less expensive and being able to handle seawater and brackish waters at high fluid velocities. Monel alloys present an economic means of handling hydrofluoric acid and are also resistant to other nonoxidizing acids. Monel alloys are not, however, resistant to oxidizing media such as nitric acid, ferric chloride, sulfur dioxide, and ammonia.
Choice of materials and processes
Published in William Bolton, R.A. Higgins, Materials for Engineers and Technicians, 2020
The need, engendered in the early 1940s, for a material suitable for the manufacture of parts for jet engines and gas turbines led to one of the epic metallurgical research projects of the twentieth century and resulted in the production of the ‘Nimonic’ series of alloys by Messrs Henry Wiggin. The basis of a Nimonic is an alloy containing 75% nickel and 20% chromium, giving a material of high melting point which will remain tough at high temperatures because of the grain-growth restricting influence of nickel and at the same time be oxidation-resistant because it becomes coated with a tenacious film of protective chromium oxide. Small amounts of carbon, along with titanium, aluminium and molybdenum, form the particles of ‘dispersoid’ which resist creep and so strengthen the alloy at high temperatures. Other alloys based on nickel and chromium, along with dispersion-hardening additions, are now available. Some are wrought alloys whilst others are cast to shape. Table 27.3 shows the effects of temperature and time on a carbon steel and two high-temperature nickel-chromium alloys.
Temperature Analysis of Nimonic Materials for Turning Process: Current Research Status and a Way Forward
Published in Purna Chandra Mishra, Muhamad Mat Noor, Anh Tuan Hoang, Advances in Mechanical and Industrial Engineering, 2022
Ajit Kumar Dhal, Amlana Panda, Ramanuj Kumar, Ashok Kumar Sahoo
Apart from these, tungsten, molybdenum, tantalum, aluminium, carbon, or another element can be added to boost oxidation-related properties and strength. At higher temperatures, nimonic alloys are more resistant to oxidation, corrosion and scaling. Nimonic 263, Nimonic PE11, Nimonic 75, Nimonic 80A, Nimonic 81, Nimonic 86, Nimonic 90, Nimonic 105, Nimonic 115, Nimonic 901, Nimonic MP35N, Nimonic 942, Nimonic C263, Nimonic PE16, Nimonic PK 33 are commercially available Nimonic alloys.
Effect of cooling passage imperfection on the flow characteristics of film-cooled gas turbine blade
Published in International Journal of Ambient Energy, 2019
H. Bharathkumar, J. Jensin Joshua, P. Booma Devi, D. Raja Joseph
A flat plate with the film cooling hole attached beneath the flat plate at a distance of 0.1 m from the leading edge of the plate is taken for investigation as shown in Figure 1(a,b) without and with imperfection, respectively. The film cooling hole is circular in cross-section and the hole is inclined to the flat plate at an angle of 35 degrees and the length to diameter ratio is 10. In the first case, the film cooling hole attached to the flat plate does not have any imperfection (Figure 1(a)). In the second case, the film cooling hole attached to the flat plate has a semi-circular imperfection (Figure 1(b)). The flat plate is assumed to be made of nimonic 15 90 alloy. NIMONIC® alloy 90 is a wrought nickel–chromium–cobalt base alloy strengthened by additions of titanium and aluminium. The operating conditions for both the cases are one and the same. They are given in Table 1. The time step is 5.4 × 10–8 s. Meshing is done using ANSYS ICEM CFD which performs the meshing using multiple blocking techniques to generate structured mapping as in Figure 2(a). As the problem in our hand is high speed, high-temperature-flow ANSYS FLUENT and ANSYS ICEM CFD serve the purpose well (Table 2). The total number of cells was 139,850. The total number of nodes was 141,975. Quad mesh and tria mesh used to mesh the domain are shown in Figure 2(b).
Influence of inner-spraying rotating tool during electrochemical milling of Nimonic-263 alloy
Published in Materials and Manufacturing Processes, 2019
K. Mishra, B. R. Sarkar, B. Bhattacharyya
Experiments have been performed on a special type of nickel-based [nickel (52%)–cobalt (19–21%)–chromium (19–21%)–molybdenum (5.6–6.1%)] superalloy which is commonly known as Nimonic-263 alloy to investigate the impact of machining parameters on the various responses of EC milling. Nimonic-263 alloy is a special graded nickel-based superalloy specially developed for high-temperature and high-strength applications due to its various superior advantages like machinability, crack and corrosion resistance, as well as high surface finish. This alloy keeps its high strength up to 816°C and good oxidation resistance up to 982°C. This alloy is used in gas turbine components and various aircraft parts where the pressure and heat are extremely high, e.g., turbine blades and exhaust nozzles in jet engines etc. An energy-dispersive X-ray spectroscopy of this alloy is shown in Fig. 1. As Nimonic-263 is a new and advanced nickel alloy, it is very much essential to know its compositions in detail. Figure 1 confirms the material as Nimonic-263, and from Fig. 1, it can be easily calculated the weight% of the elements for estimating the current efficiency in ECM.
Performance of alumina-based ceramic inserts in high-speed machining of nimonic 80A
Published in Materials and Manufacturing Processes, 2019
Vishwanath Chavan, Shirish Kadam, Mudigonda Sadaiah
Nimonic 80A is an alloy of Ni–Cr and also the presence of Al and Ti alloying increases the strength of this material. Nimonic 80A is an advanced material and shows excellent resistance to corrosion and oxidation even at a higher temperature. This study highlights the parametrical influence of cutting parameters on machined surface topography, tool wear and cutting force. The wear mechanism responsible for tool failure is also explored.