کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1573744 1514686 2016 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion
چکیده انگلیسی
A 316L stainless steel was processed by high-pressure torsion (HPT) to evaluate the grain refinement and phase transformation. The initial material was essentially a single phase γ-austenite with a coarse-grained microstructure of ∼42 µm but the grain size was reduced to ∼45 nm after 10 turns of HPT. In addition, there was a phase transformation and the initial γ-austenite transformed initially to ε-martensite and finally to α′-martensite with increasing strain. The dislocation density increased to an exceptionally high value, of the order of ∼1016 m−2, in the main α′-martensite phase after 10 HPT revolutions. The formation of the multiphase nanocrystalline microstructure yielded a four-fold increase in hardness to reach an ultimate value of ∼6000 MPa. The Hall-Petch behaviour of the HPT-processed alloy is compared directly with coarse-grained materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 657, 7 March 2016, Pages 215-223
نویسندگان
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