کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1663184 1008461 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural observations of as-prepared and thermal cycled NiCoCrAlY bond coats
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Microstructural observations of as-prepared and thermal cycled NiCoCrAlY bond coats
چکیده انگلیسی

Microstructures of as-prepared and 1100 °C/100 h isothermally annealed NiCoCrAlY bond coat specimens as well as a bond coat obtained from an end of life turbine blade were characterized with TEM. In all specimens the γ grains were observed to consist of fine γ′ precipitates, which form during cooling and are unstable at the higher operating temperatures. The β grains present in the as-prepared specimens were observed to transform to L10 martensite in the 1100 °C/100 h isothermally annealed specimen. As a result of substrate-bond coat interdiffusion the Ms temperature increases during thermal cycling due to an increase in Ni and decrease in the Cr concentrations of the β-phase. The turbine blade bond coat was also found to contain Cr and Co-rich σ-phase precipitates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 201, Issue 7, 20 December 2006, Pages 3918–3925
نویسندگان
, , , ,