scholarly journals Phase Transformation Kinetics of High Nb-TiAl Alloy during Continuous Heating

2021 ◽  
Vol 2133 (1) ◽  
pp. 012029
Author(s):  
Ying Li ◽  
Lian Zhou ◽  
Junpin Lin ◽  
Hui Chang ◽  
Jianglei Fan ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Tial Alloy ◽  
Transformation Process ◽  
Continuous Heating ◽  
Heating Process ◽  
Transformation Kinetics ◽  
Transformation Behavior ◽  
Α Phase ◽  
Two Stages ◽  
Kinetics Of

Abstract In this work, the phase transformation behavior of Ti-45Al-8.5Nb-(W, B, Y) alloy during continuous heating was investigated using dilatometer and optical microscopy. Results indicated that the phase transformation process of high Nb-TiAl alloy during continuous heating included two stages: ordered α2 → disorder α and tetragonal γ → hexagonal α. According to the microstructure analysis, the initial α2/γ lamellar structure transformed into the massive γ phase and α phase (retained as α2) during the heating process. The activation energy of α2 → α and γ → α was 989.65 kJ/mol and 995.30 kJ/mol, respectively. Moreover, the lower the heating rate was, the faster the phase transformation reached the equilibrium state.

scholarly journals Investigation of phase transformation in Fe microalloyed Ti6Al4V alloy during continuous heating process

2020 ◽  
Vol 321 ◽  
pp. 12010
Author(s):  
Changliang Wang ◽  
Feng Li ◽  
Can Ding ◽  
Hui Chang ◽  
Lian Zhou
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Expansion Method ◽  
Ti6al4v Alloy ◽  
Continuous Heating ◽  
Heating Process ◽  
Β Phase ◽  
Α Phase ◽  
Phase Transition Temperatures ◽  
Evolution Of Microstructure

The phase transformation and dilatometric curves in Fe microalloyed Ti6Al4V alloy (Ti6Al4V-Fe) during continuous heating at 1 ℃ /min heating rate had been studied by dilatometer and metallographic methods, and β phase transition temperatures of alloy were obtained. In order to validate the accuracy of these β phase transition temperature and microstructure evolution, the relative phase concentration and the evolution of microstructure which were acquired by cooling after tempering were analyzed by metallographic microscope. The results illuminated that the expansion method was able to accurately measure the β transformation temperature of Ti6Al4V-Fe alloy. The lathy-shaped α phase decreased significantly disappeared in the range of 838℃ to 988℃, and the α→β phase transformation occurred.

Isothermal Martensitic Transformation Kinetics in Ni-Mn-Sn Ferromagnetic Shape Memory Alloys

2009 ◽  
Vol 1200 ◽  
Author(s):  
Patrick Shamberger ◽  
Alexandre Pakhomov ◽  
Fumio Ohuchi
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Martensite Transformation ◽  
Transformation Kinetics ◽  
Transformation Behavior ◽  
Ferromagnetic Shape Memory Alloys ◽  
Austenite Transformation ◽  
Ferromagnetic Shape Memory ◽  
Kinetics Of ◽  
Isothermal Martensitic Transformation

AbstractThis study examines the kinetics of the martensitic phase transformation in a representative Ni-Mn-Sn Heusler alloy. Here, we present data on isothermal and continuous cooling/warming transformations in both bulk polycrystalline and individual small particle samples. We demonstrate that while the martensite to austenite transformation proceeds very rapidly (faster than the time-scale of our observations), the austenite to martensite transformation has a significant isothermal component. A similar asymmetry is also noted in transformation behavior of individual martensite plates. We conclude that the observed time dependence is due primarily to nucleation-limited kinetics.

Phase Transformation Kinetics of TiSi2

1993 ◽  
Vol 311 ◽  
Author(s):  
R.R. Mann ◽  
L.L. Clevenger ◽  
Q.Q. Hong
Keyword(s):  
Phase Transformation ◽  
Effective Activation Energy ◽  
Single Crystal Silicon ◽  
Transformation Process ◽  
Silicon Substrates ◽  
Effective Activation ◽  
Transformation Kinetics ◽  
Crystal Silicon ◽  
Face Centered ◽  
Kinetics Of

ABSTRACTThe microstructure and kinetics of the polymorphic C49 to C54-TiSi2 phase transformation have been studied using samples prepared as in self-aligned silicide applications. For C49-TiSi2 thin films formed at temperatures of 600°C and 625°C on (100) single-crystal silicon substrates, the effective activation energy was 5.6 ± 0.3 and 5.7 ± 0.08 eV, respectively, for this phase transformation carried out in the temperature range of 600°C to 700°C. The transformation process was observed to occur by nucleation and growth of the orthorhombic face-centered (C54) phase from the as-formed orthorhombic base-centered (C49) phase.

Phase transformation kinetics of Ti-1300 alloy during continuous heating

Rare Metals ◽  
2015 ◽  
Vol 34 (4) ◽  
pp. 233-238 ◽  
Author(s):  
Ming-Pan Wan ◽  
Yong-Qing Zhao ◽  
Wei-Dong Zeng
Keyword(s):  
Phase Transformation ◽  
Continuous Heating ◽  
Transformation Kinetics ◽  
Phase Transformation Kinetics ◽  
Kinetics Of

scholarly journals Continuous Cooling Transformation Behaviour and Bainite Transformation Kinetics of 23CrNi3Mo Carburised Steel

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Wenjun Song ◽  
Min Lei ◽  
Mingpan Wan ◽  
Chaowen Huang
Keyword(s):  
Phase Transformation ◽  
Volume Fraction ◽  
Austenite Formation ◽  
Steel Matrix ◽  
Transformation Kinetics ◽  
Bainite Transformation ◽  
Continuous Cooling ◽  
The Matrix ◽  
Dimensional Growth ◽  
Kinetics Of

In this study, the phase transformation behaviour of the carburised layer and the matrix of 23CrNi3Mo steel was comparatively investigated by constructing continuous cooling transformation (CCT) diagram, determining the volume fraction of retained austenite (RA) and plotting dilatometric curves. The results indicated that Austenite formation start temperature (Ac1) and Austenite formation finish temperature (Ac3) of the carburised layer decreased compared to the matrix, and the critical cooling rate (0.05 °C/s) of martensite transformation is significantly lower than that (0.8 °C/s) of the matrix. The main products of phase transformation in both the carburised layer and the matrix were martensite and bainite microstructures. Moreover, an increase in carbon content resulted in the formation of lamellar martensite in the carburised layer, whereas the martensite in the matrix was still lath. Furthermore, the volume fraction of RA in the carburised layer was higher than that in the matrix. Moreover, the bainite transformation kinetics of the 23CrNi3Mo steel matrix during the continuous cooling process indicated that the mian mechanism of bainite transformation of the 23CrNi3Mo steel matrix is two-dimensional growth and one-dimensional growth.

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