scholarly journals Influence of Heat Treatment on Phase Transformation Temperature of TiNi Shape Memory Intermetallic Compound Wire Industrially Produced by Combustion Synthesis Process

2003 ◽  
Vol 50 (5) ◽  
pp. 333-340
Author(s):  
Yoshinari Kaieda
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Intermetallic Compound ◽  
Shape Memory ◽  
Combustion Synthesis ◽  
Transformation Temperature ◽  
Synthesis Process ◽  
Phase Transformation Temperature

Study of Heat Treatment on Phase Transformation of Ni-44,8 wt% Ti Ribbons Obtained by Melting Spinning

2014 ◽  
Vol 775-776 ◽  
pp. 112-117
Author(s):  
G.C.S. Anselmo ◽  
Walmam B. de Castro ◽  
C.J. de Araújo
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Mathematic Model ◽  
Martensite Phase ◽  
Treatment Temperature ◽  
Phase Transformation Temperature ◽  
Two Parameters

Shape memory alloys (SMAs) represent a unique class of materials that undergo a reversible phase transformation (martensitic transformation) allowing these materials to display dramatic pseudoelastic stress-induced deformations and shape memory temperature-induced deformations that are recoverable. Among the known shape memory alloys, NiTi is the most commonly used because of its excellent mechanical properties, corrosion resistance and biocompatibility. This work studied the influence of two parameters of heat treatment (temperature and time) on martensite phase transformation temperature (MS) in a Ni-Ti (48,8 wt % Ti) shape memory alloy, using a factorial design (22). The aim of our research was to establish a mathematic model of the technological process, useful for controlling of martensite phase transformation temperature. The two factors, temperature and time, have an important influence on MS.

scholarly journals Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 904
Author(s):  
Hyeong Min Heo ◽  
Jun Hwan Kim ◽  
Sung Ho Kim ◽  
Jong Ryoul Kim ◽  
Won Jin Moon
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Transformation ◽  
Transformation Temperature ◽  
Fracture Behavior ◽  
Rolling Process ◽  
Normal Direction ◽  
Phase Transformation Temperature ◽  
Treatment Conditions ◽  
Creep Characteristics

In this study, the effect of heat treatment on the fracture behavior of alloy B steel with boron (B) contents as high as 130 ppm was investigated. The Alloy B are derived from Gr.92 steel with outstanding creep characteristics. The amounts of minor alloying elements such as B, N, Nb, Ta, and C were optimized to achieve better mechanical properties at high temperatures. Hence, workability of the alloy B and Gr.92 were compared. An increase in the B content affected the phase transformation temperature and texture of the steel. The development of the {111}<uvw> components in γ-fibers depended on the austenite fraction of the steel after the phase transformation. An increase in the B content of the steel increased its α-to-γ phase transformation temperature, thus preventing the occurrence of sufficient transformation under the normalizing condition. Cracks occurred at the point of the elastic-to-plastic deformation transition in the normal direction during the rolling process, thereby resulting in failure. Therefore, it is necessary to avoid intermediate heat treatment conditions, in which γ-fibers do not fully develop, i.e., to avoid an imperfect normalization.

Determination of Transformation Temperatures of SMAs by Varying the Force Using Dead Weight Method

2015 ◽  
Vol 813-814 ◽  
pp. 166-171
Author(s):  
Kiran D. Jadhav ◽  
U.S. Mallikarjun ◽  
S.H. Adarsh ◽  
S. Prashantha
Keyword(s):  
Phase Transformation ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Phase Transformation Temperature ◽  
Scanning Calorimetry ◽  
Dead Weight ◽  
Strain Behavior ◽  
Weight Method ◽  
Nitinol Alloy ◽  
Dsc Method

Shape-memory material is an alloy that “Remembers” its original shape and that when deformed to its Pre-deformed shape when heated. Phase transformation temperature is one of the most important parameters for the shape memory alloys. In this present work phase transformation temperature is measured by the dead weight method and compared with standard Differential scanning calorimetry (DSC) method. The objective of this paper is to study the microstructure of the Shape memory alloy (SMA) wire, determining the Phase Transformation temperature of NiTinol alloy i.e. Marteniste start (Ms), Martensite finish (Mf), Austenite Start (As), Austenite finish (Af) by a Dead Weight method and also studying the stress-strain behavior with variation of Temperatures to show the Shape memory effect in the NiTinol SMA wire.

High-Temperature Shape Memory Alloys Based on Ti-Platinum Group Metals Compounds

2014 ◽  
Vol 783-786 ◽  
pp. 2541-2545 ◽  
Author(s):  
Yoko Yamabe-Mitarai ◽  
Abdul Wadood ◽  
Raju Arockiakumar ◽  
Toru Hara ◽  
Madoka Takahashi ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Phase Equilibria ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Shape Recovery ◽  
Platinum Group Metals ◽  
Phase Transformation Temperature ◽  
Temperature Phase

The effect of alloying to TiPd and TiPt on phase transformation temperature, phase equilibria, and shape recovery were investigated for TiPt and TiPd base high-temperature shape memory alloys. Ru, Ir, Co and Zr were chosen for additional elements and Zr was found as the most effective element to improve shape recovery of TiPd and TiPt.

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