Effect of Grain Size and Residual Strain on the Dynamic Transformation of Austenite under Plate Rolling Conditions

2018 ◽  
Vol 89 (6) ◽  
pp. 1700547 ◽  
Author(s):  
Samuel F. Rodrigues ◽  
Clodualdo Aranas ◽  
Binhan Sun ◽  
Fulvio Siciliano ◽  
Stephen Yue ◽  
...  
Keyword(s):  
Grain Size ◽  
Residual Strain ◽  
Dynamic Transformation ◽  
Plate Rolling

Effect of Number of Roughing Passes on the Dynamic Transformation of Austenite during Simulated Plate Rolling

2018 ◽  
Vol 941 ◽  
pp. 717-722
Author(s):  
Samuel F. Rodrigues ◽  
Fulvio Siciliano ◽  
Clodualdo Aranas Jr. ◽  
Gedeon S. Reis ◽  
Brian J. Allen ◽  
...  
Keyword(s):  
Grain Size ◽  
Volume Fraction ◽  
Austenite Phase ◽  
Mean Flow ◽  
Grain Sizes ◽  
Dynamic Transformation ◽  
Plate Rolling ◽  
Forward Transformation ◽  
The Mean ◽  
Rough Rolling

When austenite is deformed within the austenite phase field, it partially transforms dynamically into ferrite. Here, plate rolling simulations were carried out on an X70 steel using rough rolling passes of 0.4 strain each. The influence of the number of roughing passes on the grain size and volume fraction of induced ferrite was determined. Up to three roughing passes applied at 1100 °C followed by 5 finishing passes at 900 °C were employed. The sample microstructures were analysed by means of metallographic techniques. Both the critical strain to the onset of dynamic transformation as well as the grain size decreased with pass number during the roughing simulations. For the finishing passes, the mean flow stresses (MFS`s) applicable to each schedule decreased when a higher number of roughing passes was applied. The volume fraction of dynamically formed ferrite retained after simulated rolling increased with the roughing pass number. This is ascribed to the increased amount of ferrite retransformed into austenite and the finer grain sizes produced during roughing. The forward transformation is considered to occur displacively while the retransformation into austenite during holding takes place by a diffusional mechanism. This indicates that both dynamic transformation (DT) and dynamic recrystallization were taking place during straining.

Dynamic Transformation of Austenite at Temperatures above the Ae3

2018 ◽  
Vol 941 ◽  
pp. 633-638
Author(s):  
John Joseph Jonas ◽  
Clodualdo Aranas Jr. ◽  
Samuel F. Rodrigues
Keyword(s):  
Electron Microscopy ◽  
Driving Force ◽  
Energy Difference ◽  
Accelerated Cooling ◽  
Free Energy Difference ◽  
Dynamic Transformation ◽  
Plate Rolling ◽  
Temperature Transformation ◽  
Mn Steel ◽  
Kinetics Of

Under loading above the Ae3 temperature, austenite transforms displacively into Widmanstätten ferrite. Here the driving force for transformation is the net softening during the phase change while the obstacle consists of the free energy difference between austenite and ferrite as well as the work of shear accommodation and dilatation during the transformation. Once the driving force is higher than the obstacle, phase transformation occurs. This phenomenon was explored here by means of the optical and electron microscopy of a C-Mn steel deformed above their transformation temperatures. Strain-temperature-transformation (STT) curves are presented that accurately quantify the amount of dynamically formed ferrite; the kinetics of retransformation are also specified in the form of appropriate TTRT diagrams. This technique can be used to improve the models for transformation on accelerated cooling in strip and plate rolling.

Dynamic Transformation during the Simulation of Plate Rolling in an X70 Steel

2016 ◽  
Vol 88 (8) ◽  
pp. 1600388 ◽  
Author(s):  
Samuel F. Rodrigues ◽  
Clodualdo Aranas ◽  
Fulvio Siciliano ◽  
John J. Jonas
Keyword(s):  
Dynamic Transformation ◽  
Plate Rolling

Prediction of the flow stress and grain size of steel during thick-plate rolling

2001 ◽  
Vol 113 (1-3) ◽  
pp. 581-586 ◽  
Author(s):  
Jong-Jin Park
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Thick Plate ◽  
Plate Rolling

Neutron Diffraction as a Tool for Non-Destructive Evaluation of Ceramics

1988 ◽  
Vol 142 ◽  
Author(s):  
John H. Root ◽  
James D. Sullivan
Keyword(s):  
Grain Size ◽  
Neutron Diffraction ◽  
Residual Strain ◽  
Mechanical Characteristics ◽  
Condensed Matter ◽  
Ceramic Composites ◽  
Non Destructive Evaluation ◽  
Minority Phase ◽  
Position Dependence ◽  
Non Destructive

AbstractNeutron diffraction is a powerful probe of the properties of condensed matter. In recent years neutron diffraction has been applied to the non-destructive evaluation of mechanical characteristics of engineering components. This paper presents examples of applications to ceramic composites including the measurement of position dependence of residual strain, grain size and minority phase concentration. In addition, an example of volume-averaged crystallographic texture is presented.

scholarly journals Microstructure and Strengthening Mechanisms in an HSLA Steel Subjected to Tempforming

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 48
Author(s):  
Anastasiia Dolzhenko ◽  
Alexander Pydrin ◽  
Sergey Gaidar ◽  
Rustam Kaibyshev ◽  
Andrey Belyakov
Keyword(s):  
Grain Size ◽  
Hsla Steel ◽  
High Strength ◽  
Carbide Precipitation ◽  
Strengthening Mechanisms ◽  
Plate Rolling ◽  
Ultrafine Grained ◽  
Quenched Steel ◽  
Low Alloyed Steel ◽  
Lamellar Type

An effect of tempforming on the microstructure, the carbide precipitation, and the strengthening mechanisms of high-strength low-alloyed steel has been analyzed. The quenched steel was subjected to 1 h tempering at a temperature of 873 K, 923 K, or 973 K followed by plate rolling at the same temperature. Tempforming resulted in the formation of an ultrafine grained lamellar-type microstructure with finely dispersed carbides of (Nb,V)C, Fe3C and Cr23C6. A decrease in tempforming temperature resulted in a reduction of the transverse grain size from 950 nm to 350 nm. Correspondingly, the size of Fe3C/Cr23C6 particles decreased from 90 nm to 40 nm while the size of (Nb,V)C particles decreased from 17 nm to 4 nm. Refining the tempformed microstructure with a decrease in thetempforming temperature provided an increase in the yield strength from 690 MPa to 1230 MPa.

Estimation of flow stress and grain size uniformity of nickel alloy steel for the heavy plate rolling process

2020 ◽  
Vol 816 ◽  
pp. 152638 ◽  
Author(s):  
Hwan Suk Lim ◽  
Jung Ho Shin ◽  
Yong Tae Kang
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Nickel Alloy ◽  
Alloy Steel ◽  
Rolling Process ◽  
Heavy Plate ◽  
Plate Rolling ◽  
Size Uniformity

scholarly journals Dynamic Transformation during the Simulated Plate Rolling of a 0.09% Nb Steel

2017 ◽  
Vol 57 (6) ◽  
pp. 1102-1111 ◽  
Author(s):  
Samuel Filgueiras Rodrigues ◽  
Clodualdo Aranas Jr. ◽  
John Joseph Jonas
Keyword(s):  
Dynamic Transformation ◽  
Plate Rolling

Residual strain and the fracture stress-grain size relationship in brittle solids

1964 ◽  
Vol 12 (2) ◽  
pp. 139-143 ◽  
Author(s):  
F.J.P Clarke
Keyword(s):  
Grain Size ◽  
Residual Strain ◽  
Fracture Stress ◽  
Size Relationship ◽  
Brittle Solids
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