Evolution of microstructure and microtexture during the hot deformation of Mg–3% Al

2010 ◽  
Vol 58 (12) ◽  
pp. 4253-4266 ◽  
Author(s):  
Étienne Martin ◽  
John J. Jonas
Keyword(s):  
Hot Deformation ◽  
Evolution Of Microstructure ◽  
Microstructure And Microtexture

Evolution of microstructure and microtexture during hot deformation in an advanced P/M nickel base superalloy

2018 ◽  
Vol 146 ◽  
pp. 217-236 ◽  
Author(s):  
S.S. Satheesh Kumar ◽  
T. Raghu ◽  
Pinaki P. Bhattacharjee ◽  
G. Appa Rao ◽  
Utpal Borah
Keyword(s):  
Hot Deformation ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Evolution Of Microstructure ◽  
Base Superalloy ◽  
Microstructure And Microtexture

Evolution of Microstructure during Hot Deformation of the PM Molybdenum Alloy TZM

2007 ◽  
Vol 539-543 ◽  
pp. 2725-2730 ◽  
Author(s):  
T. Mrotzek ◽  
Andreas Hoffmann ◽  
U. Martin ◽  
H. Oettel
Keyword(s):  
Yield Strength ◽  
Hot Deformation ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
High Strength ◽  
Tensile Tests ◽  
Primary Recrystallization ◽  
Molybdenum Alloy ◽  
Texture Formation ◽  
Evolution Of Microstructure

The molybdenum alloy TZM (Mo-0.5wt%Ti-0.08wt%Zr) is a commonly used structural material for high temperature applications. For these purposes a high strength at elevated temperatures and also a sufficient ductility at room temperature are being aimed. Preceding investigations revealed the existence of subgrains in hot deformed TZM. It was observed that with proceeding primary recrystallization and therefore with disappearance of subgrains the yield strength drops almost to a level of pure molybdenum. It is being assumed that the existence of a dislocation substructure has a pronounced effect on the yield strength of TZM. The aim of the present study was to evaluate the subgrain and texture formation and also to estimate the dislocation arrangement within subgrains during hot deformation. Hence, TZM rods were rolled to different degrees of deformation at a temperature above 0.5 Tm. The microstructure of the initial material was fully recrystallized. Texture formation, misorientation distributions and subgrain sizes were analyzed by electron backscattering diffraction (EBSD). Mechanical properties were characterized by tensile tests at room temperature and up to 1200°C. It was revealed, that with increasing degree of deformation a distinct substructure forms and therefore yield strength rises. Consequently, the misorientation between adjacent subgrains increases, their size decreases and a <110> fibre texture develops. To estimate the influence of texture on strength of TZM the Taylor factors are calculated from EBSD data.

In Situ High-Energy XRD Study of the Hot-Deformation Behavior of a Novel γ-TiAl Alloy

2012 ◽  
Vol 1516 ◽  
pp. 71-76 ◽  
Author(s):  
Andreas Stark ◽  
Emanuel Schwaighofer ◽  
Svea Mayer ◽  
Helmut Clemens ◽  
Thomas Lippmann ◽  
...  
Keyword(s):  
Hot Deformation ◽  
Deformation Behaviour ◽  
Length Change ◽  
High Energy ◽  
Hot Forming ◽  
Post Process ◽  
Microstructure Parameters ◽  
Underlying Mechanisms ◽  
Evolution Of Microstructure

ABSTRACTThe development of suitable hot-forming processes, e.g. forging, is an important step towards the serial production of TiAl parts. Several microstructure parameters change during hot-forming. However, the underlying mechanisms can normally only be inferred from post process metallographic studies.We used a deformation dilatometer modified for working in the HZG synchrotron beamlines at DESY for hot-deformation experiments. This setup enables the in situ monitoring of the interaction and evolution of microstructure parameters during processing. We observed the evolution of phase fractions, grain size and crystallographic texture during deformation while simultaneously recording the process parameters, like temperature, force and length change.Here we present the hot compressive deformation behaviour of a Ti-43Al-4Nb-1Mo-0.1B (in at.%) alloy. Several specimens were deformed at three temperatures each with two compression rates. During the experiments the Debye-Scherrer diffraction rings were continuously recorded.

Evolution of microstructure and microtexture upon recrystallization of submicrocrystalline niobium

2020 ◽  
Vol 86 ◽  
pp. 105117 ◽  
Author(s):  
Michael Degtyarev ◽  
Tatyana Chashchukhina ◽  
Lyudmila Voronova ◽  
Tatyana Gapontseva ◽  
Vladimir Levit
Keyword(s):  
Evolution Of Microstructure ◽  
Microstructure And Microtexture

Effect of Warm-Rolling on the Formation of Microstructure and Microtexture of the Constituent Phases in a Duplex Steel

2014 ◽  
Vol 783-786 ◽  
pp. 2555-2560 ◽  
Author(s):  
Prasad Bhattacharjee Pinaki ◽  
Zaid Ahmed Mohammed
Keyword(s):  
Cold Rolling ◽  
Room Temperature ◽  
Volume Fraction ◽  
Warm Rolling ◽  
Pure Metal ◽  
Steel Plates ◽  
Duplex Steel ◽  
Cold Rolled ◽  
Evolution Of Microstructure ◽  
Microstructure And Microtexture

The effect of warm-rolling on the evolution of microstructure and microtexture was investigated in a duplex steel. For this purpose annealed duplex steel plates were cold and warm-rolled up to 90% reduction in thickness at room temperature and at 625°C, respectively. The austenite volume fraction decreased consistently during cold-rolling indicating that austenite was not stable during cold-rolling. In contrast, austenite was found to be very stable during warm-rolling at 625°C. Development of an ultrafine lamellar deformation structure with alternate arrangement of the ferrite and austenite bands could be observed during warm-rolling. A strong pure metal or copper type texture was observed in the austenite in the warm-rolled material in contrast to brass texture developed during cold-rolling. Development of RD (RD//<110>) fiber and ND-fiber (ND//<111>) was observed in ferrite during both cold and warm-rolling. However, the strength of the RD-fiber was much higher as compared to the ND-fiber in ferrite in cold-rolled DSS as compared to the ferrite in warm-rolled DSS.

scholarly journals Evolution of Microstructure and Microtexture in Friction Stir Welded Oxide Dispersion Strengthened Steel

2013 ◽  
Vol 19 (S2) ◽  
pp. 714-715 ◽  
Author(s):  
B.W. Baker ◽  
S. Menon ◽  
L.N. Brewer
Keyword(s):  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Oxide Dispersion Strengthened Steel ◽  
Friction Stir ◽  
Evolution Of Microstructure ◽  
Microstructure And Microtexture

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Effect of Hot Deformation Temperature on the Restoration Mechanisms and Texture in a High-Cr Ferritic Stainless Steel

2013 ◽  
Vol 762 ◽  
pp. 705-710 ◽  
Author(s):  
Saara Mehtonen ◽  
L. Pentti Karjalainen ◽  
David A. Porter
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Electron Backscatter Diffraction ◽  
Shear Bands ◽  
Compression Tests ◽  
Recrystallized Grain Size ◽  
Evolution Of Microstructure ◽  
Backscatter Diffraction

The effect of hot deformation temperature on the deformed microstructures and evolution of microstructure and texture of a 21Cr Ti-Nb dual-stabilized ferritic stainless steel was studied using plane strain hot compression tests on a Gleeble 1500 thermomechanical simulator. The deformation was carried out at 550 - 950 °C with a strain of 0.5 at 1 s-1. The compression was followed by fast cooling to room temperature in order to study the deformed microstructures. Some specimens were heated from the deformation stage to either 750 or 950 °C and held for 0 or 30 s in order to study the nucleation process of recrystallization. The electron backscatter diffraction technique was used to analyze the resultant microstructures and textures. Lowering of the deformation temperature increased the rate of static recrystallization (SRX) and decreased the recrystallized grain size. After deformation at 550 and 600 °C and complete SRX, beneficial γ-fibre texture formed presumably as a result of nucleation at in-grain shear bands. SRX after deformation at 750 °C or above led to the formation of harmful α-fibre textures with weak γ-fibre.

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