کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5456548 1514665 2016 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718
چکیده انگلیسی
The hot deformation behavior of an IN718 superalloy was studied by isothermal compression tests under the deformation temperature range of 950-1100 °C and strain rate range of 0.001-1 s−1 up to true strains of 0.05, 0.2, 0.4 and 0.7. Electron backscattered diffraction (EBSD) technique was employed to investigate systematically the effects of strain, strain rate and deformation temperature on the subgrain structures, local and cumulative misorientations and twinning phenomena. The results showed that the occurrence of dynamic recrystallization (DRX) is promoted by increasing strain and deformation temperature and decreasing strain rate. The microstructural changes showed that discontinuous dynamic recrystallization (DDRX), characterized by grain boundary bulging, is the dominant nucleation mechanism in the early stages of deformation in which DRX nucleation occurs by twining behind the bulged areas. Twin boundaries of nuclei lost their ∑3 character with further deformation. However, many simple and multiple twins can be also regenerated during the growth of grains. The results showed that continuous dynamic recrystallization (CDRX) is promoted at higher strains and large strain rates, and lower temperatures, indicating that under certain conditions both DDRX and CDRX can occur simultaneously during the hot deformation of IN718.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 678, 15 December 2016, Pages 137-152
نویسندگان
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