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martensite-transformation-temperature
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Damage development during the strain induced phase transformation of austenitic stainless steels at low temperatures
, Article Modelling and Simulation in Materials Science and Engineering ; Volume 29, Issue 4 , 2021 ; 09650393 (ISSN) ; Ganjiani, M ; Sasani, F ; Sharif University of Technology
IOP Publishing Ltd
2021
Abstract
The strain-induced martensitic transformation greatly affects the plastic behavior of the metastable austenitic stainless steels. The martensitic transformation continuously changes the initially homogeneous material into a strongly heterogeneous bi-phase one. In addition to the hardening behavior, this phenomenon would influence the damage growth and load-carrying capacity of the material during the plastic deformation. In this study, plastic behavior of the material AISI 304 including the hardening and damage growth, has been examined at low temperature; where a high rate of martensitic transformation affects the microstructure strongly. Experimental analysis and microscopic observations...
The effects of homogenization time and cooling environment on microstructure and transformation temperatures of Ni-42.5wt%Ti-7.5wt%Cu alloy
, Article Defect and Diffusion Forum ; Volume 297-301 , 2010 , Pages 344-350 ; 10120386 (ISSN); 3908451809 (ISBN); 9783908451808 (ISBN) ; Shokuhfar, A ; Etaati, A ; Dorri M., A ; Saatian, A ; Sharif University of Technology
Trans Tech Publications Ltd
2010
Abstract
The present paper deals with different effects of homogenization time and cooling environment on Ni-42.5wt%Ti-7.5wt%Cu alloy. The alloy was prepared by vacuum arc melting. Afterwards, three homogenization times (half, one and two hour) and three cooling environments (water, air and furnace) at 1373 K were selected. Optical and Scanning Electron Microscopic methods, EDX, DSC and hardness tests have been used to evaluate the microstructure, transformation temperatures and hardness. Results indicate that specimens that were cooled in air are super-saturated. Also, the microstructure from furnace cooling has many disparities with the other cooling environments' microstructure and two types of...
Porous shape memory dental implant by reactive sintering of TiH2–Ni-Urea mixture
, Article Materials Science and Engineering C ; Volume 107 , 2020 ; Sadrnezhaad, S .K ; Hosseini, S. A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
We produced bifurcated bone-like shape memory implant (BL-SMI) with desirable tooth-root fixation capability by compact-sintering of TiH2–Ni-urea mixture. The primary constituents of the porous product were Ni and Ti. We could adjust the pores' shape, size, and interconnectivity for favorite bone ingrowth by using urea as a space holder. Without urea, we obtained an average porosity of 0.30, and a mean void size of 100 μm. With 70 vol % urea, we got 62% interconnected pores of 400 μm average size. Aging allowed us to tune the austenite-martensite transformation temperatures towards the needed body tissue arouse. Differential scanning calorimetry measured the transformation temperatures....