کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620199 988603 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-dimensional atom probe microscopy study of interphase precipitation and nanoclusters in thermomechanically treated titanium-molybdenum steels
ترجمه فارسی عنوان
بررسی میکروسکوپ اتم سه بعدی اتمسفر بین فاز و نانوکیلرها در فولاد تیتانیوم-مولیبدن تحت درمان با ترمومکانیکی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
Atom probe microscopy was used to generate tomographic analyses of solute clustering and precipitation reactions in a Ti-Mo added microalloyed steel under simulated strip-rolling conditions. It was observed that the interphase row spacing of precipitates was reduced with the application of a pre-strain. The atom probe data also revealed the coexistence of nanoclusters and precipitate particles, even after isothermal holding for 3600 s. These microstructural features occurred both within 3-D interphase precipitate sheets, and in randomly selected fields of view. A bimodal distribution of larger (∼8-10 nm) precipitates coexisted with smaller nanoclusters (∼3 nm) within the interphase sheets/rows. Both the nanoclusters and the precipitates possessed a disc morphology, although nanoclusters with less than ∼30 atoms were more irregular in shape. The size of the nanoclusters and the precipitates was expressed as a Guinier radius, and this varied between 0.5 and 8 nm for both strain conditions, with the average size ∼1.8 nm. The composition of the nanoclusters varied over a wide range, yet was mostly rich in C. All of the nanoclusters and precipitates consisted of a mixture of Ti, Mo and C and the average precipitate composition was close to that of MC carbide stoichiometry, where M represents a mixture of Ti and Mo. In the majority of cases, the Ti/Mo ratio in the MC carbides was > 1. As the Guinier radius increased above 2.5 nm, the composition range became narrower, towards the MC carbide stoichiometry, with a small amount of Fe (∼3-12 at.%).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 7, April 2013, Pages 2521-2530
نویسندگان
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