کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1561172 1513937 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Swelling effect on stress induced and concentration dependent diffusion of nitrogen in plasma nitrided austenitic stainless steel
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Swelling effect on stress induced and concentration dependent diffusion of nitrogen in plasma nitrided austenitic stainless steel
چکیده انگلیسی

The kinetics of plasma nitriding of austenitic stainless steel (ASS) below temperatures of nitrides formation and mechanisms of nitrogen penetration are analyzed by proposed kinetic modeling. By fitting of experimental nitrogen depth profiles it is shown that the main processes are nitrogen concentration gradient and internal stresses induced diffusion with concentration dependant diffusion coefficient and also swelling. Internal stress induced diffusion is responsible for plateau formation in nitrogen depth profile which is characteristic for nitriding process. In order to fit experimental curves of different samples (with different nitriding duration time) with fixed diffusion coefficient it is necessary to include concentration dependant diffusion and swelling process. It is shown that diffusion coefficient depends on concentration according to Einstein–Smoluchowski relation. The swelling thickness is the square root function of nitriding time.


► The nitrogen diffusion and swelling process in plasma nitrided ASS are analyzed.
► The model considers the stress–diffusion interaction during nitriding process of ASS.
► The stress induced diffusion with D(CN) model was applied to nitrided AISI 316L.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 72, May 2013, Pages 140–145
نویسندگان
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