چکیده مقاله
In this paper, the variations of microstructure and hardness of the AA6082 T651 welding Heat Affected Zone HAZ has been studied To reach the aim, scanning and transmission electron microscopes equipped with EDS were used and hardness and micro hardness tests were performed The hardness of the base metal was 112 HV, which is suitable for 6082 aluminum alloy in the age hardened condition Evaluation of hardness variations based on distance from fusion line showed that Hardness decreased throughout wide HAZ However, the hardness of partially melted zone was higher than that of other heat affected zones due to fully dissolution of Mg2Si precipitates and the consequent natural aging In all specimens, there was a valley in HAZ hardness profiles with a value of about 55 HV half the base metal hardness Microstructural investigations of this zone revealed that βʺ precipitates were transformed into β and as aresult, the zone was over aged Moreover, the dislocation recovery caused to reduce dislocation density Therefore, over aging and dislocation recovery was determined as HAZ softening agents α Al15 Fe,Mn 3Si2 precipitates with blocky and Chinese script morphology were observed in the base metal microstructure In the PMZ, these precipitates mainly had blocky morphology with preferential placement on elongated rolled grain boundaries Sub micron Mn rich spherical phases were unchanged in the HAZ relative to the base metal
کلیدواژهها
نویسندگان
Mohammad Jula
PhD candidate, Department of Materials Science & Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Reza Dehmolaei
Assisstant Professor, Department of Materials Science & Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Khalil Ranjbar۳
Professor, Department of Materials Science & Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran;
شیوه ارجاع
Jula, Mohammad and Dehmolaei, Reza and Ranjbar۳, Khalil,1400,On the Microstructural and Hardness Variations of the Heat Affected Zone in the AA6082-T651 Weld Joints,4th International Conference on Welding and Non Destructive Testing & 22nd National Conference on Welding & Inspection & 11th National Conference on NDT,Isfahan
ارائهشده در
مجموعه مقالات چهارمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب و بیست و دومین کنفرانس ملی جوش و بازرسی و یازدهمین کنفرانس ملی آزمایش های غیرمخرب18 اسفند 1400 · اصفهان