One important question to consider when creating a new part is which metal to use. Although some applications may have clear-cut answers, such as choosing plain carbon steel because it is inexpensive, others may not.
Inconel
Inconel is a type of nickel-chrome-based superalloy with excellent corrosion resistance, oxidation resistance, high-temperature strength, and creep resistance. Due to two factors, Inconel can withstand high temperatures and extremely corrosive environments. The formation of the intermetallic compound Ni3Nb in the gamma double prime (") phase is one reason. On the grain boundaries, this intermetallic phase acts as a 'glue.' When heated to high temperatures, this 'glue' prevents the grains from expanding in size (for the most part, smaller grains mean a high strength and larger grains lend themselves to a higher ductility).
Second, due to the passivation layer that forms when Inconel is heated, it has high corrosion resistance. Inconel alloys are ideal for applications ranging from hot section gas turbines to deep-sea good drilling because of these two factors. So, what are the drawbacks to these alloys? They're pricey, difficult to machine, and difficult to work with.
Stainless Steel
Chromium content of greater than 10.5 percent by weight distinguishes stainless steels. Traditional steels are less resistant to corrosion than stainless steels. Austenitic, Ferritic, Martensitic, Duplex, and Precipitation stainless steels are divided into five categories. Steels that can be hardened. The microstructure that forms in these stainless steel alloys is named after them. Duplex stainless steel is made up of a combination of austenitic and ferritic elements.
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