کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5455540 1514642 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Anisotropic tensile behavior of in situ precipitation strengthened Inconel 718 fabricated by additive manufacturing
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Anisotropic tensile behavior of in situ precipitation strengthened Inconel 718 fabricated by additive manufacturing
چکیده انگلیسی
This study investigated the microstructure and anisotropic mechanical properties of selective laser melting (SLM) processed Inconel 718 (IN718) component. In as-fabricated alloys, ultrafine columnar grained microstructure with highly dispersed precipitates γ" phases at grains boundary and even-distributed γ' phases inside the grains were observed. It was demonstrated that the as-fabricated longitudinal samples showed lower ultimate tensile strength (UTS) of 1101 MPa but higher elongation of 24.5% compared to the transverse samples which showed UTS of 1167 MPa and elongation of 21.5%. The excellent mechanical properties of both the longitudinal and transverse samples can be ascribed to the refined microstructure of the SLM material resulting from the high cooling rate imposed by laser processing. The anisotropy in strength and ductility was attributed to the {100} fiber texture and columnar grain morphology. The {100} fiber texture of columnar grains leads to high strength in transverse direction, while the columnar grain boundaries also served as a path along which damage can preferentially accumulate, leading to fracture.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 701, 31 July 2017, Pages 344-351
نویسندگان
, , , , , , ,