Phase transformation behavior and kinetics of high Nb–TiAl alloy during continuous cooling

2016 ◽  
Vol 668 ◽  
pp. 22-26 ◽  
Author(s):  
Ying Li ◽  
Lian Zhou ◽  
Junpin Lin ◽  
Hui Chang ◽  
Feng Li
Keyword(s):  
Phase Transformation ◽  
Tial Alloy ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Continuous Cooling ◽  
Kinetics Of

Phase transformation behavior of a Mn containing β-solidifying γ-TiAl alloy during continuous cooling

2018 ◽  
Vol 99 ◽  
pp. 51-58 ◽  
Author(s):  
Hao Xu ◽  
Xiaobing Li ◽  
Weiwei Xing ◽  
Lei Shu ◽  
Yingche Ma ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Tial Alloy ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Continuous Cooling

Phase Transformation Behavior of Niobium Containing Microalloyed Steel with Predeformation and Continuous Cooling

2014 ◽  
Vol 804 ◽  
pp. 281-284
Author(s):  
Yuan She ◽  
Zhao Hui Zhang ◽  
Jian Tao Ju ◽  
Bo Jin
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
Microalloyed Steel ◽  
Stored Energy ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Continuous Cooling ◽  
Cooling Phase ◽  
Niobium Microalloyed Steel ◽  
Change Of Microstructure

The continuous cooling phase transformation behavior of niobium microalloyed steel was studied by Thermecmastor-Z thermomechanical simulator; the continuous cooling transformation curves (CCT) were established. The change of microstructure under different cooling rates was observed, and the influence of deformation in austenite non-recrystallization region on transformation was discussed. Based on these work, it was possible to know that the phase transformation is retarded and the ferritic grain is refined dramatically as the cooling rate increasing. The deformation in austenite non-recrystallization region caused deformation stored-energy, which improved the grain refinement of transformation to some extent, but not significant.

Phase Transformation Behavior and Microstructure Characterization of 9Ni Cryogenic Steel

2012 ◽  
Vol 472-475 ◽  
pp. 1183-1187
Author(s):  
Duan Jun Wang ◽  
Yu Hui Wang ◽  
Li Gang Liu ◽  
Wen Jun Liu ◽  
Xi Qing Zhao ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Heat Affected Zone ◽  
Transformation Behavior ◽  
Cooling Rates ◽  
Area Density ◽  
Continuous Cooling Transformation ◽  
Phase Transformation Behavior ◽  
Continuous Cooling ◽  
Cryogenic Steel

The SHCCT (simulated heat affected zone continuous cooling transformation) of 9Ni cryogenic steel were investigated. The microstructures observed in simulated heat affected zone (HAZ) continuous cooled specimens are composed of bainite (B) and martensite (M) depending on the cooling rates. The dimension of prior austensite grain, M-A constituent content, M-A dimension, M-A area density increase with increased the time of t8/5.

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 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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