کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
796206 902796 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the formation of serrated grain boundaries and fan type structures in an advanced polycrystalline nickel-base superalloy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
On the formation of serrated grain boundaries and fan type structures in an advanced polycrystalline nickel-base superalloy
چکیده انگلیسی

The formation of serrated grain boundaries and fan-type structures in an advanced polycrystalline nickel-base superalloy has been extensively studied and linked to the thermal history. The development of grain boundary serrations has been quantitatively linked to the cooling rate from the solution heat treatment temperature. Slower cooling rates were found to result in more convoluted grain boundaries formed as a result of impingement of growing secondary γ′. Subtle differences were also noted in the γ′ distributions in the vicinities of the grain boundaries, in particular they exhibit differences in size, morphology and chemistry as a function of location within the grain, all of which are reported in the paper. Fan-type structures were found to form in the alloy, irrespective of the cooling rate employed, although their size and volume fraction increased with a decrease in cooling rate. The presence of these structures is shown to impact upon the total length of grain boundary and the degree of serration. The fan-type structures exhibit a typical dendritic morphology and were found to nucleate on minor phases present within the alloy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 209, Issue 2, 19 January 2009, Pages 1011–1017
نویسندگان
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