Abstract
Hot deformation behavior and the microstructural evolution of Inconel 625 superalloy plates are investigated by hot compression tests in a range of working temperatures (800–1050 °C) and strain rates (0.001–1 s−1). The microstructural observation shows that a strong <110> texture forms when the processing temperature is below 950 °C, whose intensity decreases with the increases of the temperature, and it disappears when compressing above 950 °C. During the compression test, twin-related dynamic recrystallization (DRX) occurs in the investigated temperature range, and the intensity of twin-related DRX increases with the increases of the temperature. In addition, as the temperature increases, the intensity of continuum DRX decreases.
Highlights
Inconel 625 (IN625) superalloy is widely used in the aviation industry, oil extraction and chemical processing, and other fields because of its great high-temperature strength, oxidation resistance, and corrosion resistance [1,2,3,4]
Gao et al [10] studied the influence of the twin boundaries on the microstructural evolution and mechanical behavior of IN625 alloy and found that twin boundaries be good for grain refinement of the alloy, and strengthen the alloy by interface strength mechanism
The influence of heat treatment processes on IN625 processed by laser powder bed fusion (LPBF) has been studied [11,12], and the results show that the tensile property is greatly influenced by the texture and an appropriate heat treatment process can improve the tensile properties and oxidation resistance of IN625 alloy
Summary
Inconel 625 (IN625) superalloy is widely used in the aviation industry, oil extraction and chemical processing, and other fields because of its great high-temperature strength, oxidation resistance, and corrosion resistance [1,2,3,4]. The microstructure and mechanical properties are greatly affected by the coupled thermo-mechanical effects [5]. Several studies have focused on the microstructure evolution and recrystallization behavior of IN625 alloy [6,7,8,9]. Gao et al [10] studied the influence of the twin boundaries on the microstructural evolution and mechanical behavior of IN625 alloy and found that twin boundaries be good for grain refinement of the alloy, and strengthen the alloy by interface strength mechanism. The influence of heat treatment processes on IN625 processed by laser powder bed fusion (LPBF) has been studied [11,12], and the results show that the tensile property is greatly influenced by the texture and an appropriate heat treatment process can improve the tensile properties and oxidation resistance of IN625 alloy
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