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Iranian Journal of Materials Science and Engineering، جلد ۲۲، شماره ۱، صفحات ۸۵-۹۸
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عنوان انگلیسی Effect of Pre-cold Deformation and Welding Current Mode on Mechanical Properties and Microstructure of GTAWed Nimonic 80A Superalloy
چکیده انگلیسی مقاله This study investigates the microstructural evolution and variations in the mechanical properties of pre-cold worked Nimonic 80A superalloy, subjected to two levels of deformation (25% and 50%) and welded via Gas Tungsten Arc Welding (GTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) techniques using ER309L filler wire. The objective is to evaluate the effect of the initial microstructure on the welding behavior of Nimonic 80A and compare the weldments produced using GTAW and PCGTAW. Microstructural characterization was conducted using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). XRD analysis demonstrated that the welding pulsed current mode, compared to the continuous current mode and at equal heat input, led to a refined microstructure, suggesting improved welded mechanical properties of the weld. It also showed a potential reduction in grain refinement with a higher level of cold work. Tensile testing demonstrated that fractures consistently occurred within the weld zone (WZ), with the PCGTAW sample achieving the highest tensile strength (766 MPa). Microhardness analysis indicated a notable reduction in hardness within the heat-affected zone (HAZ) and WZ, particularly in the 50% pre-cold worked sample. However, PCGTAW retained higher hardness due to its refined microstructure. The weld metal primarily consisted of an austenitic microstructure characterized by dendrites and interdendritic precipitates. Microstructural analysis revealed that welding induced significant changes in the weldment, with the PCGTAW sample exhibiting a more uniform microstructure and smoother transitions at the weld interface. Fractography confirmed ductile fracture in all specimens, with smoother and more uniformly distributed dimples in the PCGTAW sample. These findings highlight the advantages of pulsed current welding in optimizing the mechanical performance of Nimonic 80A welds and suggest its potential application in industries requiring superior weld quality.
کلیدواژه‌های انگلیسی مقاله Nimonic 80A Superalloy,GTAW Welding,Pre-Cold Worked,Initial Microstructure,PCGTAW Process.
نویسندگان مقاله | Amirreza Bali Chalandar
(a) Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.(b) Department of Advanced Materials & Processing, Research and Development of Engineering Materials Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.


| Amirreza Farnia
(a) Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.(b) Department of Advanced Materials & Processing, Research and Development of Engineering Materials Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.


| Hamidreza Najafi
(a) Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.(b) Department of Advanced Materials & Processing, Research and Development of Engineering Materials Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.


| Hamid Reza Jafarian
School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
نشانی اینترنتی http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5556-1&slc_lang=en&sid=1
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Synthesis and preparation of materials to meet the requirements of AM techniques
نوع مقاله منتشر شده Research Paper
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