International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
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Improving the properties of Ni-Based Alloys by Co Addition Auqib Mushtaq1, Abhishek Thakur2 1M.Tech
Scholar, Universal Institute of Engineering & Technology, Lalru Professor, Universal Institute of Engineering & Technology, Lalru ----------------------------------------------------------------------------***-------------------------------------------------------------------------Abstract: Grain refinement is caused by the addition of Co, which is why changing the amount of Co may be regarded to have 2Assitant
an effect on both the microstructure and the behavior of corrosion. The behavior of the grain during corrosion is directly influenced by grain refining. After combining the powders of nickel, chromium, aluminum, and cobalt in the appropriate proportions, the alloys were then compacted to produce green pellets as the next step in the synthesis process. In the last step, the samples were created by using a technology called vacuum arc melting and casting. Both x-ray diffraction and optical microscopy were used in order to characterize the samples after they had been produced. The Vickers hardness tester was used to provide an assessment of the surface's toughness. It has been discovered that the characteristics of the alloy have been greatly improved. Keyword: Ni Based Alloys, Corrosion properties, Vacuum arc melting
1. Introduction: According to the results, the coating's corrosion resistance was improved over the substrate when compared to that of the substrate itself, while its hardness and wear resistance both improved as the amount of Ti and B4C contained inside it grew. Plasma cladding is the method of fabricating products that sees the most widespread use in industry due to its exceptional benefits. These benefits include excellent arc stability, high energy exchange efficiency (due to its relatively high energy density), low thermal distortion (due to its low cost of equipment), good matrix bonding (due to its thick coating), and low thermal distortion. Plasma cladding is the method of fabricating products that sees the most widespread use in industry due to its exceptional benefits. The choice of alloying components has been shown to have a significant impact on the microstructure of alloys as well as the resistance of alloys to corrosion [1]. Wen et al. [2] studied how the presence of different microstructures affected the corrosion resistance of Ni-Al intermetallic compounds that were synthesized by vacuum melting. According to the findings, a significant number of grain boundaries were found, and the presence of a multiphase structure led to the formation of a significant number of corrosive galvanic cells, which in turn led to severe corrosion. Both of these phenomena were caused by the presence of severe corrosion. Ye et al. [3] were able to create a crack-free CrMnFeCoNi highentropy alloy coating by using an approach that involved laser surface alloying. This coating resulted in the formation of a single face-centered cubic (FCC) phase and had a level of corrosion resistance that was comparable to that of stainless steel 304. Ni has the potential to produce stable compounds as a solid solution element in a solid solution system if it is combined with numerous alloying elements and is a component of strengthening phases. [4–6] One of the reasons why chromium is so often used to improve a material's resistance to corrosion is because it has the potential to generate a dense oxide covering. However, very little study has been done on the effect that optimizing the materials used has on the composition and phase evolution of the plasma cladding at different stages of the process. Ni is a transition metal with a molar mass of 58.69 g mol and a density of 8.90 g cm-3 when heated to 25 degrees Celsius. In the solid form, it exhibits a face-centered cubic (fcc) crystal structure, which is a kind of cubic. It melts at 1453 degrees Celsius and is resistant to corrosion and oxidation at temperatures ranging from mild to high. A value as low as 68.44 nm at 20 degrees Celsius indicates that the electrical resistivity of Ni is minimal when the temperature is kept low. When exposed to an oxidising environment, it is chemically inactive, and its corrosion resistance falls. Ni is a very adaptable metal that can easily combine with the majority of other metals to make alloys. Cobalt is located between the elements iron and nickel on the periodic table. Co has a molar mass of 58.93 g mol-1 and a density of 8.85 g cm-3, which are both comparable to Ni's molar mass and density. Cobalt is a ferromagnetic metal, similar to Ni in that it has a magnetic field. Co may exist in two distinct crystalline forms depending on the temperature; hexagonal closed packed at 417 °C and fourfold closed packed at 417 °C and 1493 °C, respectively (melting point) [(hcp; ε-Co) at T < 417 °C, and fcc; (α-Co)]. The combination of Co and Ni leads in a reduction in corrosion and wear rates [7]. Because of their superior qualities when compared to pure Ni or Co, nickel and cobalt-based alloys have been investigated as potential technical coatings. High strength, improved wear and corrosion resistance,
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