چکیده مقاله
This study investigates the microstructural evolution during gas metal arc welding GMAW of dissimilar joints between CoCrFeMnNi high entropy alloy HEA and AISI 304 stainless steel using ER316L filler wire, under varying heat inputs 0 19 vs 0 40 kJ/mm Optical microscopy, FE SEM/EDS, XRD, and CALPHAD thermodynamic calculations were employed Results show that low heat input produced an asymmetric joint with incomplete penetration and a sharp, unmixed zone at the 304SS interface, yielding a fusion zone dominated by FCC austenite with minor δ ferrite In contrast, high heat input achieved full penetration but caused underfill on the HEA side and significantly altered weld metal composition, increasing Mo content from 2 37 wt % to 20 48 wt % due to enhanced dilution This high Mo composition thermodynamically stabilized brittle intermetallic phases, as confirmed by XRD which identified σ phase and an ordered Co0 72Fe0 28 Compound alongside FCC and BCC phases in the high heat input joint The σ phase, measuring approximately 40 2 at % Cr, 38 3 at % Fe, and 21 5 at % Mn, formed in the HAZ due to slower cooling rates It is concluded that low heat input GMAW with ER316L filler suppresses detrimental phase formation, promoting a predominantly austenitic microstructure, while high heat input, though improving mixing, promotes extensive σ phase formation that is detrimental to joint integrity
کلیدواژهها
نویسندگان
Farzad Habibi
Ph D , Sahand University of Technology Iran
Yousef Ahmadkhanpour
Master of Science, Sahand University of Technology Iran
Habib Hamed Zargari
Assistant Professor, Sahand University of Technology Iran
Parvaneh Farshbaf
Ph D , Sahand University of Technology Iran
شیوه ارجاع
Habibi, Farzad and Ahmadkhanpour, Yousef and Zargari, Habib Hamed and Farshbaf, Parvaneh,1404,Microstructural Evolution during Gas Metal Arc Welding of Cantor CoCrFeMnNi High Entropy Alloy and 304 Austenitic Stainless Steel,8th International Conference on Welding and Non Destructive Testing & 26th National Conference on Welding & Inspection & 15th National Conference on NDT & 4th National Conference on Additive Manufacturing,Tehran
ارائهشده در
مجموعه مقالات هشتمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب، بیست و ششمین کنفرانس ملی جوش و بازرسی، پانزدهمین کنفرانس ملی آزمایش های غیرمخرب و چهارمین کنفرانس ملی ساخت افزایشی20 بهمن 1404 · تهران