Microstructure and Mechanical Properties of Service-Exposed HP-MA Heat-Resistant Steel Tube, Used in Cracking Furnaces
- سال انتشار: 1401
- محل انتشار: مجله ی بین المللی انجمن آهن و فولاد ایران، دوره: 19، شماره: 2
- کد COI اختصاصی: JR_ISSIRAN-19-2_015
- زبان مقاله: انگلیسی
- تعداد مشاهده: 188
نویسندگان
Isfahan University of Technology
Department of Materials Engineering, Isfahan University of Technology. Isfahan. Iran
Isfahan University of Technology
Department of Materials Engineering, Isfahan University of Technology, Isfahan ۸۴۱۵۶-۸۳۱۱۱, Iran
چکیده
Cracking tubes as the main part of an olefin unit, are exposed to very harsh working conditions at both outer and inner surfaces, associated with major microstructural changes during service. Carburization, oxidation, alloying elements depletion, carbide coarsening, and secondary carbide formations are common phenomena, expected to take place in cracking tubes. This research tries to experimentally investigate the implications of cracking service exposure on microstructure and mechanical properties of the service-exposed HP-MA cracking tubes. In this regard, two tube samples after ۲۰۰۰۰ and ۴۵۰۰۰ h service at approximately ۹۰۰ °C were selected. Microstructure degradation at the inner and outer surfaces of the tubes and their mid-thickness were investigated with optical and electron microscopes. By microstructural characteristics of both tube samples, it was concluded that in the ۴۵,۰۰۰-hour sample, which was more exposed to carbon, the number of secondary carbides formed on the outer surface was higher. Hardness variation across the thickness was also measured for both tubes and according to the results, in total thickness of the ۴۵,۰۰۰-hour sample, the hardness was more than the ۲۰,۰۰۰-hour specimen.کلیدواژه ها
Carburization, Cracking Tubes؛ Heat-resistant steels؛ HP-MA steel؛ Oxidationاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.