کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7171687 1463738 2016 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laboratory simulation of martensite formation of white etching layer in rail steel
ترجمه فارسی عنوان
شبیه سازی آزمایشگاهی از تشکیل مارنزیتی لایه اچینگ سفید در فولاد ریلی
کلمات کلیدی
لایه اچینگ سفید، تشکیل مارتنزیت، شبیه سازی آزمایشگاهی، افزایش دما، محاسبات ترمودینامیکی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
White etching layer (WEL) is a frequently observed microstructural phenomenon in rail surface, formed during dynamic wheel/rail contact. It is considered as one of the main initiators for rolling contact fatigue cracks. There are several hypotheses for the formation mechanism of WEL. However, due to the complicated wheel/rail contact conditions, none is directly proven. Currently, the most popular hypotheses refer to either formation of martensitic WEL by phase transformations or formation of nanocrystalline ferritic WEL by severe plastic deformation. In this work, WEL formation by martensitic transformation in R260Mn grade pearlitic rail steel was simulated by fast heating and quenching experiments. Microstructural characteristics of the simulated WEL and WEL observed in a field rail specimen were characterized by microhardness, optical microscopy, scanning electron microscopy and electron backscatter diffraction. Microstructures of the two WELs were compared and similarities in morphology were identified. Numerical simulation shows the possible temperature rise up to austenitizing temperatures. Combining comparisons of experimental simulation with observation of WEL in the rail and the thermodynamic calculations, the hypothesis for WEL formation via martensitic transformation is supported.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 91, Part 1, October 2016, Pages 11-20
نویسندگان
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