scholarly journals Orientation dependence of transformation induced plasticity in high carbon bainitic steel

2021 ◽  
Vol 1121 (1) ◽  
pp. 012022
Author(s):  
R Ueji ◽  
Y Kimura ◽  
K Ushioda ◽  
T Ohmura ◽  
T Inoue ◽  
...  
Keyword(s):  
Orientation Dependence ◽  
Bainitic Steel ◽  
High Carbon ◽  
Transformation Induced Plasticity

scholarly journals Shaping Microstructure and Mechanical Properties of High-Carbon Bainitic Steel in Hot-Rolling and Long-Term Low-Temperature Annealing

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 384
Author(s):  
Tomasz Dembiczak ◽  
Marcin Knapiński
Keyword(s):  
Mathematical Models ◽  
Hot Rolling ◽  
Constitutive Equations ◽  
Rolling Process ◽  
Bainitic Steel ◽  
Compression Tests ◽  
High Carbon ◽  
Bainite Steel ◽  
Dilatometric Studies

Based on the research results, coefficients in constitutive equations, describing the kinetics of dynamic, meta-dynamic, and static recrystallization in high-carbon bainitic steel during hot deformation were determined. The developed mathematical model takes into account the dependence of the changing kinetics in the structural size of the preliminary austenite grains, the value of strain, strain rate, temperature, and time. Physical simulations were carried out on rectangular specimens. Compression tests with a flat state of deformation were carried out using a Gleeble 3800. Based on dilatometric studies, coefficients were determined in constitutive equations, describing the grain growth of the austenite of high-carbon bainite steel under isothermal annealing conditions. The aim of the research was to verify the developed mathematical models in semi-industrial conditions during the hot-rolling process of high-carbon bainite steel. Analysis of the semi-industrial studies of the hot-rolling and long-term annealing process confirmed the correctness of the predicted mathematical models describing the microstructure evolution.

scholarly journals Influence of niobium microalloying on the microstructure and mechanical properties of high carbon nano bainitic steel

2019 ◽  
Vol 14 ◽  
pp. 729-737 ◽  
Author(s):  
P Ponguru Senthil ◽  
K Sudhakara Rao ◽  
Hillol Kumar Nandi ◽  
Vajinder Singh ◽  
Suraj Kumar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bainitic Steel ◽  
High Carbon ◽  
Niobium Microalloying ◽  
Microstructure And Mechanical Properties

scholarly journals In-Situ Characterization by High-Energy X-ray Diffraction of the Phase Transformations Leading to Transformation-Induced Plasticity-Aided Bainitic Steel

2019 ◽  
Vol 3 (4) ◽  
pp. 25
Author(s):  
Zélie Tournoud ◽  
Frédéric De Geuser ◽  
Gilles Renou ◽  
Didier Huin ◽  
Patricia Donnadieu ◽  
...  
Keyword(s):  
Carbon Content ◽  
Phase Transformations ◽  
High Energy ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Bainitic Steel ◽  
X Ray Diffraction ◽  
Transformation Induced Plasticity ◽  
X Ray

The phase transformations occurring during the heat treatments leading to transformation-induced plasticity (TRIP)-aided bainitic steel have been investigated in-situ by high-energy X-ray diffraction (HEXRD) conducted with synchrotron light at 90 keV. Direct microstructure characterization has been performed by electron microscopy using electron backscatter diffraction and orientation and phase mapping in a transmission electron microscope. HEXRD data allow the quantification of the evolution of the austenite phase fraction with the heat treatments, as well as its carbon content and the fraction of carbides, from the lattice parameter evolution. It is shown that different combinations of austenite fraction and carbon content can be reached by adjusting the heat treatment temperature.

The Effect of Time and Temperature Variations during Isothermal Annealing on the Mechanical Properties of High Carbon Bainitic Steel

2012 ◽  
Vol 706-709 ◽  
pp. 2158-2163 ◽  
Author(s):  
Bartosz Koczurkiewicz
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Industrial Development ◽  
Isothermal Annealing ◽  
Testing Machine ◽  
Mechanical Tests ◽  
Bainitic Steel ◽  
High Carbon ◽  
Temperature Variations ◽  
Temperature Range

The industrial development require new materials characterized highest mechanical properties. The conditions of thermo-mechanical treatment proved to highest level of mechanical properties for steels. Another method of making strong materials is to reduce the scale of the microstructure using heat treatment [1]. The paper presents the results of investigation into the effect of time and temperature variations during isothermal annealing on the mechanical properties of high carbon (c.a. 0,8%C) bainitic steel. Chemical composition of that steel (addition Si, Mn, Mo and Cr) obtain high level of tensile strength and good plastic properties. The analyzing of published results of researches of high carbon bainitic steels shown, that transformation of bainite can take between 2 to 60 days within the temperature range 125÷325°C [2,3] Based on results of researches of investigated steel a isothermal annealing in temperature range 200÷300°C were done. The experiments were done for 24, 50 and 100 hours of annealing. After that the mechanical tests were done. A Zwick Z100 testing machine was used for tests. The force and elongation values were recorded. On their basis, the proof stress and tensile strength of the steel tested were determined as a function of annealing temperature. The microstructure were determinated too.

An Experimental Study on Machinability of Austempered Ductile Irons During Dry Turning by Ceramic Cutting Tools

2012 ◽  
Author(s):  
Xuhong Guo ◽  
Dongdong Wan
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Ductile Iron ◽  
Cutting Forces ◽  
Cutting Tools ◽  
High Carbon ◽  
Transformation Induced Plasticity ◽  
Secondary Shear Zone ◽  
Scanning Electron

Experimental investigation on the dry-turnned machinability of austempered ductile iron (ADI) samples using CC650 ceramic cutting tools were carried out in this paper, in which ADI samples are isothermally quenched at 300°C, 350°C, 400°C (hereafter referred as ADI300, ADI350, ADI400, respectively), chip morphologies were also characterized using scanning electron microscope (SEM).Results showed that they own different machinabilities based on the analysis of cutting forces and chip characteristics, strongly implying that ADI350 sample exhibits a relatively improved machinability while its mechanical properties are excellent. However, the cutting force of ADI400 is largest due to its lowest strength, hardness and toughness. The chips of ductile iron (DI) are continuous, while the chips of ADI present segmented and less coiled. The shear localization in the primary and secondary shear zone of ADI chips are correlated with the cutting forces and the wear rate of cutting tools. High carbon austenite transform into marten site due to transformation induced plasticity (TRIP) mechanism during the machining operation lead to an increase in cutting forces and a decrease of machinability.

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