کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7992940 | 1516150 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of heat treatment on microstructure, corrosion, and shape memory characteristics of laser deposited NiTi alloy
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The aim of this work is to study the effect of heat treatment on the microstructure, phase transformations, shape memory characteristics and corrosion behaviour of laser deposited equiatomic NiTi alloy. Dense samples of NiTi alloy were fabricated using Laser Engineered Net Shaping (LENSâ¢) with two different laser energy densities by varying the scan speed and laser power. These samples were annealed for 30â¯minâ¯at 500â¯Â°C and 1000â¯Â°C in flowing argon, followed by furnace-cooling to room temperature. The resulting microstructures and properties were compared with the corresponding as-deposited samples. Microstructural analysis after heat treatment showed needle-shape martensite in the samples processed at lower laser energy density of 20â¯J/mm2, and lenticular or plate-like martensite in the samples processed at 80â¯J/mm2. The XRD results revealed relatively high concentration of martensite (B19â²) in heat-treated NiTi alloy compared to as-processed samples. Furthermore, the heat treatment decreased the forward and reverse transformation temperatures of NiTi alloy from 80 - 95â¯Â°C to 20-40â¯Â°C, presumably due to annihilation of thermally induced defects. Interestingly, the samples annealed at 500â¯Â°C showed a measurable increase of 1-2% in the shape memory recovery, from the net recovery of 8% exhibited by the as-processed NiTi alloy. The corrosion resistance of laser-processed NiTi alloy decreased upon annealing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 744, 5 May 2018, Pages 337-346
Journal: Journal of Alloys and Compounds - Volume 744, 5 May 2018, Pages 337-346
نویسندگان
Jithin J. Marattukalam, Vamsi K. Balla, Mitun Das, Srikanth Bontha, Sreeram K. Kalpathy,