Martensitic transformation in titanium alloys with a high damping capacity

1998 ◽  
Vol 40 (5) ◽  
pp. 207-209
Author(s):  
Yu. K. Favstov
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys ◽  
Damping Capacity

Hydrogen Influence on Martensitic Transformation and Shape Memory Effect in Titanium Alloys

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-1145-C8-1150
Author(s):  
A.A. Ilyin ◽  
M.Yu. Kollerov ◽  
A.M. Mamonov ◽  
A.A. Krastilevsky ◽  
D.Yu. Makarenkov
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Titanium Alloys ◽  
Shape Memory Effect ◽  
Memory Effect

Analysis on the Martensitic Transformation in the Ti-xNb Alloys Using a Phenomenological Theory

2007 ◽  
Vol 124-126 ◽  
pp. 1669-1672 ◽  
Author(s):  
Hi Won Jeong ◽  
Seung Eon Kim ◽  
Chang Yong Jo ◽  
Yong Tae Lee ◽  
Joong Kuen Park
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Titanium Alloys ◽  
Martensitic Transformations ◽  
Phenomenological Theory ◽  
Transition Elements ◽  
Low Elastic Modulus ◽  
Diffraction Peaks

The titanium alloys containing the Nb transition elements have been investigated as the Ni-free shape memory and the biomedical alloys with a low elastic modulus. The mechanical properties of the alloys depended upon the meta-stable phases like the α`, α``, ω. To study the martensitic transformations from the β to α`` or α` the Ti-xNb (x=0 to 40 wt%) alloys were melted into the button type ingots using a VAR, and followed by the water-quenching after the soaking at 1000oC for 2hrs. The crystallography of the martensitic phases in the water-quenched alloys was analyzed using a XRD. The diffraction peaks of the orthorhombic martensites were identified by the crystallographic relationship with the bcc matrix. The lattice parameters of the orthorhombic martensites were varied continuously with the contents of the Nb elements. The martensitic transformations of the alloys were studied using the phenomenological theory of Bowles and Mackenzie.

Effect of Thermal Cycling (γε) on Martensitic Transformation Kinetics and Damping Capacity of Fe –17mass%Mn Alloy

2006 ◽  
Vol 319 ◽  
pp. 59-66 ◽  
Author(s):  
Young Kook Lee ◽  
Young Seob Seo ◽  
Won Jin ◽  
Chong Sool Choi
Keyword(s):  
Martensitic Transformation ◽  
Thermal Cycling ◽  
Damping Capacity ◽  
Transformation Kinetics ◽  
Burst Mode ◽  
Martensite Content ◽  
Nucleation Sites ◽  
Ε Martensite

Effect of thermal cycling(γ↔ε) on γ→ε martensitic transformation kinetics and damping capacity of Fe-17mass%Mn alloy has been studied. The amount of ε martensite increases with thermal cycling in spite of decrease in Ms temperature. The increase in ε martensite content with thermal cycling is attributable to an increase in the density of martensite nucleation sites by introduction of dislocations during thermal cycling. The γ→ε martensitic transformation kinetics shows a burst mode in the non-cycled specimen, while the kinetics exhibits a sigmoidal mode in the cycled specimens. The damping capacity of the alloy increases with increasing the ε martensite content in the non-cycled specimen. On the contrary, the damping capacity of the alloy decreases with increasing the ε martensite content in the cycled specimens. The reason is that the dislocations introduced during thermal cycling, which obstruct the movement of the damping sources, become more with thermal cycling.

Specific features of martensitic transformation in titanium alloys

1965 ◽  
Vol 7 (4) ◽  
pp. 233-238 ◽  
Author(s):  
S. G. Fedotov ◽  
E. P. Sinodova
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys

The Role of Martensitic Transformation in Thermomechanical Development of Microstructure and Plasticity of Two-Phase Ti-6Al-4V Titanium Alloy

2016 ◽  
Vol 687 ◽  
pp. 3-10 ◽  
Author(s):  
Maciej Motyka ◽  
Jan Sieniawski ◽  
Waldemar Ziaja
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Martensitic Transformation ◽  
Titanium Alloys ◽  
Thermomechanical Processing ◽  
Solution Treatment ◽  
Phase Morphology ◽  
Two Phase ◽  
Α Phase ◽  
Hot Plasticity

Phase constituent morphology in microstructure of two-phase α+β titanium alloys is determined by conditions of thermomechanical processing consisting of sequential heat treatment and plastic deformation operations. Results of previous research indicate that particularly solution treatment preceding plastic deformation significantly changes α-phase morphology and determines hot plasticity of titanium alloys. In the paper thermomechanical processing composed of β solution treatment and following hot forging of Ti-6Al-4V titanium alloy was analysed. Development of martensite plates during heating up and hot deformation was evaluated. Microscopic examinations revealed that elongated and deformed α-phase grains were fragmented and transformed into globular ones. Significant influence of martensitic transformation on elongation coefficient of α-phase grains after plastic deformation was confirmed. Based on results of elevated temperature tensile tests it was established that α-phase morphology in examined two-phase α+β titanium alloy, developed in the thermomechanical processing, can enhance their hot plasticity – especially in the range of low strain rates.

Martensitic Transformation and Damping Behavior of Fe-Mn-Nb Damping Alloys

2021 ◽  
Vol 1016 ◽  
pp. 315-324
Author(s):  
Feng Chen ◽  
Fu Kuan Liang ◽  
Wei Lin Ye ◽  
Yun Xiang Tong ◽  
Li Li
Keyword(s):  
Martensitic Transformation ◽  
Volume Fraction ◽  
Damping Capacity ◽  
Damping Characteristics ◽  
Maximum Value ◽  
Damping Behavior ◽  
Ε Martensite ◽  
Tan Δ ◽  
Nb Addition

In the present study, the microstructure, martensitic transformation and damping characteristics of Fe-17Mn-xNb (x = 0, 0.5, 1, 2, 4 wt. %) alloys were investigated. Nb addition leads to the variation in both the volume fraction and the size of ε martensite, in addition, the formation of Fe2(Nb, Mn) precipitates. The martensitic transformation exhibits a tiny dependence on the content of Nb. The addition of Nb helps to enhance the damping capacity of Fe-17Mn. The maximum value of tan δ = 0.054 is achieved in Fe-17Mn-1Nb alloy, which is increased by 42% over Fe-17Mn. The damping mechanism caused by adding Nb is discussed in terms of the volume fraction and the size of ε martensite. Besides, the role of Fe2(Nb, Mn) is also taken into account.

Effect of prior β grain size on the martensitic transformation of titanium alloys

2021 ◽  
pp. 111525
Author(s):  
Sang Won Lee ◽  
Hyeon Jin Lee ◽  
Jae Hyeok Kim ◽  
Chan Hee Park ◽  
Jae-Keun Hong ◽  
...  
Keyword(s):  
Grain Size ◽  
Martensitic Transformation ◽  
Titanium Alloys

scholarly journals Effects of Alloying Elements on Martensitic Transformation Behavior and Damping Capacity in Fe-17Mn Alloy

1997 ◽  
Vol 07 (C5) ◽  
pp. C5-453-C5-458 ◽  
Author(s):  
S. H. Baik ◽  
J. C. Kim ◽  
K. K. Jee ◽  
W. Y. Jang ◽  
M. C. Shin
Keyword(s):  
Martensitic Transformation ◽  
Alloying Elements ◽  
Damping Capacity ◽  
Transformation Behavior
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