Gas Tungsten Arc Welding of HP Heat Resistant Steel with ۲۵Cr-۳۵Ni and ۳۵Cr-۴۵Ni Filler Metals
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 112
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شناسه ملی سند علمی:
JR_ISSIRAN-18-2_004
تاریخ نمایه سازی: 2 خرداد 1402
چکیده مقاله:
This paper investigates the effects of ۲۵Cr-۳۵Ni and ۳۵Cr-۴۵Ni filler metals on the weldability, microstructure, and mechanical properties of ۲۵Cr-۳۵Ni heat-resistant steel. Alloy ۲۵Cr-۳۵Ni is known to have excellent high temperature properties, such as creep resistance and high temperature corrosion/oxidation resistance, making this grade an ideal option for demanding high temperature applications in oil, gas, and petrochemical industries. Gas tungsten arc welding is a routine welding practice for the repair and joining of components, made of heat resistant steels. Microstructure and mechanical properties of welded samples with ۲۵Cr-۳۵Ni and ۳۵Cr-۴۵Ni filler metals were studied using optical microscopy, electron microscopy, and tensile and hardness tests. Fractography of fracture surfaces was also conducted, using electron microscope. Results show that the microstructure in the heat affected zone area in both cases are largely affected by the heat input during melting. A noticeable carbide dissolution was observed in both cases. In neither of filler metals was there any indication of sigma phase formation in the weld, which is related to the high nickel content of filler metals. Results also showed that mechanical properties in both cases are controlled by heat affected zone.
کلیدواژه ها:
نویسندگان
Ayoub Asadollahi
Department of Materials Engineering, Isfahan University of Technology, Isfahan ۸۴۱۵۶-۸۳۱۱۱, Iran
Morteza Shamanian
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
Abbas Bahrami
Department of Materials Engineering, Isfahan University of Technology, Isfahan ۸۴۱۵۶-۸۳۱۱۱, Iran