کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
831977 908113 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of service-induced microstructural changes on the failure of a cobalt-based superalloy first stage nozzle
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Influence of service-induced microstructural changes on the failure of a cobalt-based superalloy first stage nozzle
چکیده انگلیسی

The present work was carried out to investigate the influence of serviced-induced microstructural changes on the failure of cobalt-base superalloy X-45 using in a first stage gas turbine nozzle. The obtained results show that the continuous film of carbides in the grain boundaries and the formation of needle like phases in the interior of grains are due to transformation of primary carbides M6C type to secondary carbides M23C6 type as a result of high-temperature operations. This dense and continuous net of the carbides reduces ductility and toughness of the alloy in comparison with the initial values. Therefore, failure was facilitated by cyclic stresses during start-up/shutdown of gas turbine.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 31, Issue 7, August 2010, Pages 3504–3511
نویسندگان
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