Abstract
Inconel 625 alloys are widely applied for high-corrosion resistance and as high-efficiency materials in aeronautical, aerospace, chemical, nuclear, petrochemical, and marine industries. Although Inconel 625 alloys are excellent materials, they cannot be formed at room temperature owing to difficulties in processing. To improve the formability of Inconel 625, it is necessary to investigate its formability at a high-temperature range and its strain rate variation. In this study, high-temperature deformation behavior after forming was investigated. A high-temperature compression test was performed with a Gleeble 3500 testing machine at various temperatures (approximately 900–1200 °C) and strain rates (10 and 30 s−1) to obtain the high-temperature deformation characteristics of Inconel 625. Furthermore, high-temperature tensile tests were performed to measure elongations and reductions in the area of the Inconel 625 alloy. The tests focused on obtaining the flow stress data and optimal hot forging conditions under various strain rates and temperatures. The results of this research are expected to contribute to hot forming processes and to formability in hot extrusion and pilger processes.
Highlights
The demand for offshore plants in the shipbuilding and offshore industries has increased sharply.the demand for nickel alloy seamless tubes, which have high environmental resistance, has increased
The existing manufacturing process for high-corrosion-resistant nickel base superalloy seamless pipes, such as Inconel 625 and Inconel 718, involves a boring process where holes are processed in the center of the billet to make a preform shape, and high-corrosion-resistant pipe is produced by hot extrusion and the pilger process using the preform
The shape of the stress-strain curve exhibits a steady state in which the flow stress increases when the strain increases until the maximum stress is observed, and the flow stress gradually decreases until no further stress reduction is observed after a constant strain
Summary
The demand for nickel alloy seamless tubes, which have high environmental resistance, has increased. The existing manufacturing process for high-corrosion-resistant nickel base superalloy seamless pipes, such as Inconel 625 and Inconel 718, involves a boring process where holes are processed in the center of the billet to make a preform shape, and high-corrosion-resistant pipe is produced by hot extrusion and the pilger process using the preform.
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