Hot Rolling of FeSi Steels – Effects by Hot Rolling in the Two Phase Region

2011 ◽  
Vol 704-705 ◽  
pp. 1161-1166 ◽  
Author(s):  
J. Schneider ◽  
W. Jungnickel ◽  
W. Müller ◽  
Harti Hermann ◽  
R. Kawalla
Keyword(s):  
Phase Transformation ◽  
Hot Rolling ◽  
Experimental Studies ◽  
Phase Region ◽  
Process Conditions ◽  
Stress Strain ◽  
Two Phase ◽  
Strain Behaviour ◽  
Finish Rolling ◽  
Effect Of Hot Rolling

Finish rolling in the two-phase region may offer new possibilities for improving the properties of the FeSi steels with phase transformation. Therefore a deeper understanding of the effects by hot rolling in the two phase region or mixed rolling: multistep hot rolling in the two phase region and in the ferrite region on the evolution of the microstructure is desirable. In this paper we will present the results of our experimental studies on the effect of hot rolling in the intercritical state on the hardening and softening in the ferrite state. It will be demonstrated that depending on the process conditions at hot rolling the austenite ferrite transformation affects the stress strain behaviour in the ferrite state at multistep hot rolling remarkable.

scholarly journals Deformation and Phase Transformation of Disordered α Phase in the (α + γ) Two-Phase Region of a High-Nb TiAl Alloy

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4817
Author(s):  
Haitao Zhou ◽  
Fantao Kong ◽  
Yanbo Wang ◽  
Xiangwu Hou ◽  
Ning Cui ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Dynamic Recrystallization ◽  
Hot Rolling ◽  
Tial Alloy ◽  
Phase Region ◽  
Two Phase ◽  
Continuous Dynamic Recrystallization ◽  
Α Phase ◽  
Continuous Dynamic ◽  
Lower Temperature

In this paper, the deformation and phase transformation of disordered α phase in the (α + γ) two-phase region in as-forged Ti-44Al-8Nb-(W, B, Y) alloy were investigated by hot-compression and hot-packed rolling. The detailed microstructural evolution demonstrated that the deformed microstructure was significantly affected by the deformation conditions, and the microstructure differences were mainly due to the use of a lower temperature and strain rate. Finer α grains were formed by the continuous dynamic recrystallization of α lamellae and α grains distributed around lamellar colonies. Moreover, the grooved γ grains formed by the phase transformation from α lamellae during hot rolling cooperated with and decomposed α lamellae. A microstructure evolution model was built for the TiAl alloy at 1250 °C during hot rolling.

scholarly journals The nature of the change of the surface temperature of the workpiece during hot rolling of pipe steel

2018 ◽  
Vol 224 ◽  
pp. 01104 ◽  
Author(s):  
Vladimir Nekit ◽  
Sergey Platov ◽  
Maksim Krasnov
Keyword(s):  
Surface Temperature ◽  
Hot Rolling ◽  
Pipe Steel ◽  
Practical Importance ◽  
Experimental Studies ◽  
Phase Region ◽  
Work Piece ◽  
Two Phase ◽  
Deformation Processes ◽  
Two Stages

The article is devoted the experimental studies of deformation and temperature parameters of rolling the pipe steel on the rolling mill 5000 PJSC “MMK”. Knowledge of the regularities of the change in the surface temperature of work piece during hot rolling under the conditions of thermo mechanical deformation processes is of great theoretical and practical importance. The temperature conditions determine the energy and force parameters of rolling, as well as the mechanical properties and microstructure of the finished products. The experimental rolling was carried out in two stages: roughing at 6 passes at a temperature of 1050-900 ° C and finishing at 18-20 passes at a temperature below the start of the phase transformation of 900 ° C. The finishing rolling has been carried out in a two-phase region at the stage of polymorphic transformation in the steel. Significant differences in the nature of temperature changes at different stages of rolling are revealed.

scholarly journals Effect of hot rolling history and cooling rate on the phase transformation of plain carbon steel

2017 ◽  
Vol 55 (04) ◽  
pp. 229-236
Author(s):  
I. SCHINDLER ◽  
S. RUSZ ◽  
P. OPĚLA ◽  
J. RUSZ ◽  
Z. SOLOWSKI ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Cooling Rate ◽  
Hot Rolling ◽  
Plain Carbon Steel ◽  
Effect Of Hot Rolling

scholarly journals Effect of Reverse-phase Transformation Annealing Process on Microstructure and Mechanical Properties of Medium Manganese Steel

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1633 ◽  
Author(s):  
Yan Zhao ◽  
Lifeng Fan ◽  
Bin Lu
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Volume Fraction ◽  
Lath Martensite ◽  
Phase Region ◽  
Manganese Steel ◽  
Reverse Phase ◽  
Two Phase ◽  
Fine Grain ◽  
Martensite Microstructure

In order to develop a third-generation automobile steel with powerful strength and elongation, we propose a method through high temperature quenching and two-phase region reverse-phase transformation annealing to develop such steel with 0.13% C and 5.4% Mn. To investigate the microstructure evolution and mechanical properties of manganese steel, SEM, XRD and TEM are employed in our experiments. Experimental results indicate that the microstructure after quenching is mainly lath martensite microstructure with average of lath width at 0.5 μm. The components of the steel after along with reverse-phase transformation annealing are ultra-fine grain ferrite, lath martensite and different forms of austenite microstructure. When the temperature at 625 °C, the components of the steel mainly includes lath martensite microstructure and ultra-fine grain ferrite and the fraction of austenite volume is only 5.09%. When the annealing temperature of reverse-phase transformation increase into 650 °C and 675 °C, the austenite appears in the boundary of the ferritic grain boundary and the boundary of lath martensite as the forms of bulk and lath. The phenomenon appears in the bulk of austenite, and the size of is 0.22 μm, 0.3 μm. The fraction of austenite volume is 22.34% at 675 °C and decreases into 9.32% at 700 °C. The components of austenite mainly includes ultra-fine grained ferrite and lath martensite. Furthermore, the density of decreases significantly, and the width of martensite increases into 0.32 μm. In such experimental settings, quenching at 930 °C with 20 min and at 675 °C with 30 min reverse-phase transformation annealing, the austenite volume fraction raises up to 22.34%.

Effect of Hot Rolling and Strip Tension on Mechanical Properties of Cold-Rolled Two-Phase Ferritic-Martensitic Steels

Metallurgist ◽  
2017 ◽  
Vol 60 (9-10) ◽  
pp. 930-936 ◽  
Author(s):  
A. V. Nishchik ◽  
I. G. Rodionova ◽  
O. N. Baklanova ◽  
A. V. Grishin ◽  
R. R. Adigamov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Rolling ◽  
Martensitic Steels ◽  
Two Phase ◽  
Strip Tension ◽  
Cold Rolled ◽  
Effect Of Hot Rolling

scholarly journals Aging Behavior and Precipitation Analysis of Cu-Ni-Co-Si Alloy

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 435
Author(s):  
Xiangpeng Xiao ◽  
Jian Huang ◽  
Jinshui Chen ◽  
Hai Xu ◽  
Zhao Li ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Aging Process ◽  
Kinetic Curve ◽  
Kinetic Equations ◽  
Phase Region ◽  
Transformation Kinetic ◽  
Precipitation Kinetic ◽  
Two Phase ◽  
Transmission Electron ◽  
Co Addition

Cu-Ni-Si alloy with a different Co content was prepared by inductive melting and hot rolling. The alloy was solution treated at 950 °C for 1.5 h and aged at 450 °C, 500 °C, and 550 °C for different times. The phase diagram calculation and transmission electron microscopy was used to investigate the effect of Co addition on the aging precipitation behavior of the Cu-Ni-Si alloy. The phase transformation kinetics equation was calculated as well. The results show that, with the increase of aging temperature, the two-phase region of Fcc + Ni2Si in the Cu-Ni-Si ternary diagram would get wider. Some NixSiy phases would also form in the Cu-rich isothermal section. The addition of Co would replace part of Ni to form the (Ni, Co)2Si phase, which inhibits the spinodal decomposition process of the Cu-Ni-Si alloy during the aging process. The precipitated phase of the Cu-Ni-Si alloy with a high content of the Co element is more likely to grow with the extension of aging time. The phase transformation kinetic equations of the Cu-Ni-Si alloy at 450 °C and 500 °C showed good agreement with the experimental results. Furthermore, it can be seen from the precipitation kinetic curve the addition of the Co element accelerates precipitation in the aging process.

Effect of Hot Rolling Parameters on Excess Phase Precipitation in Two-Phase Ferritic-Martensitic Steels

Metallurgist ◽  
2016 ◽  
Vol 60 (7-8) ◽  
pp. 817-821
Author(s):  
A. V. Nishchik ◽  
I. G. Rodionova ◽  
O. N. Baklanova ◽  
A. V. Grishin ◽  
D. L. D’yakonov
Keyword(s):  
Hot Rolling ◽  
Martensitic Steels ◽  
Phase Precipitation ◽  
Two Phase ◽  
Excess Phase Precipitation ◽  
Excess Phase ◽  
Effect Of Hot Rolling

scholarly journals Deformation and Phase Transformation of Disorder α Phase at (α+γ) two Phase Region in high Nb Containing TiAl alloy

2021 ◽  
Author(s):  
Haitao Zhou ◽  
Fantao Kong ◽  
Yanbo Wang ◽  
Xiangwu Hou ◽  
Ning Cui ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Microstructural Evolution ◽  
Microstructure Evolution ◽  
Tial Alloy ◽  
Temperature Drop ◽  
Alpha Phase ◽  
Phase Region ◽  
Two Phase ◽  
Α Phase ◽  
Assisted Decomposition

In this paper, the deformation and phase transformation of disorder α phase at (α + γ) two phase region in as-forged Ti-44Al-8Nb-(W, B, Y) alloy are investigated by hot compression and hot packed rolling. Detailed microstructural evolution demonstrates that the as-deformed microstructure is significantly affected by deformation conditions. The mircrostructure differences are mainly due to temperature drop and strain rate. The evolution of α lamelae into α grains is detailed descripted. Moreover, the disorder α lamellae can also be decomposed into some new α grains by the assisted decomposition mechanism of γ grains. Microstructure evolution model of current TiAl alloy at 1250 °C during hot rolling is built.

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