Progress of Recrystallisation in Cold Rolled Austenitic Stainless Steel during Cyclic Thermal Process

2011 ◽  
Vol 702-703 ◽  
pp. 627-630
Author(s):  
B. Ravi Kumar
Keyword(s):  
Retained Austenite ◽  
Thermal Process ◽  
Annealing Treatment ◽  
Ultrafine Grain ◽  
Electron Backscattered Diffraction ◽  
Aisi 304L ◽  
Grain Formation ◽  
Strain Induced Martensite ◽  
Cold Rolled ◽  
Evolution Of Microstructure

The present study aims to understand the evolution of microstructure leading to nano/ultrafine grain formation during cyclic thermal process. A commercial grade of AISI 304L austenitic SS was cold rolled which resulted in a creation of a dual microstructure having strain induced martensite (43%) and heavily deformed retained austenite. The dual phase microstructure was subjected to cyclic thermal annealing process at 825 °C. The events occurring in; a) retained austenite and b) reverted austenite formed by phase reversion of strain induced martensite, during annealing treatment, were studied by the Electron backscattered diffraction (EBSD). The study revealed recrystallisation process of the two austenite grains, which resulted into ultrafine grain formation during cyclic thermal process.

Influence of Annealing Process on Recrystallisation Behaviour of a Heavily Cold Rolled AISI 304L Stainless Steel on Ultrafine Grain Formation

2012 ◽  
Vol 715-716 ◽  
pp. 334-339 ◽  
Author(s):  
B. Ravi Kumar ◽  
J.K. Sahu ◽  
S.K. Das
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Thermal Process ◽  
Austenitic Stainless Steels ◽  
Ultrafine Grain ◽  
304L Stainless Steel ◽  
Aisi 304L ◽  
Aisi 304L Stainless Steel ◽  
Grain Formation ◽  
Cold Rolled

AISI 304L austenitic stainless steel was cold rolled to 90% with and no inter-pass cooling to produced 89% and 43% of deformation induced martensite respectively. The cold rolled specimens were annealed by isothermal and cyclic thermal process. The microstructures of the cold rolled and annealed specimens were studied by the electron microscope. The observed microstructural changes were correlated with the reversion mechanism of martensite to austenite and strain heterogeneity of the microstructure. The results indicated possibility of ultrafine austenite grain formation by cyclic thermal process for austenitic stainless steels those do not readily undergo deformation induced martensite. Keywords: Austenitic stainless steel, Grain refinement, Cyclic thermal process, Ultrafine grain

Fabrication and mechanical properties of ultrafine structured dissimilar laminated metal composite sheets (LMCS)

2015 ◽  
Vol 22 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Zejun Chen ◽  
Quanzhong Chen ◽  
Qing Liu ◽  
Zheng Zhou ◽  
Guojun Wang
Keyword(s):  
Mechanical Properties ◽  
Annealing Treatment ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Recrystallization Annealing ◽  
Metal Composite ◽  
Treatment Technology ◽  
Cold Rolled ◽  
Ultrafine Grain Structure

AbstractThe ultrafine grain structure is very difficult to fabricate by severe plastic deformation (SPD) for metals with poor formability. In this paper, a fabrication technology of ultrafine structured dissimilar laminated metal composite sheets (LMCS) was developed for poor plastic metals which have low elongation by hot accumulative roll bonding (ARB) in conjunction with cold rolling. The hot ARBed 1100/7075 LMCS was cold rolled at room temperature after recrystallization annealing treatment. An ultrafine structured dissimilar LMCS was obtained without undergoing severe cold rolled deformation. The mechanical properties were enhanced and optimized by using heat treatment technology. The accelerated refining mechanism of grain was revealed by microstructure characterization of the composite sheet. The enhanced strength was mainly derived from the fine layers, refined grains, increased dislocation accumulation, and abundant dispersoids. The results of the research are helpful in improving the mechanical properties of dissimilar LMCS and optimizing the preparation technology.

Evolution of Microstructure and Mechanical Properties with Different Partitioning Conditions of Q&P Steels

2016 ◽  
Vol 879 ◽  
pp. 1420-1425
Author(s):  
Artem Arlazarov ◽  
Melanie Ollat ◽  
Jean Philippe Masse ◽  
Magalie Bouzat
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Saturation Magnetization ◽  
Tensile Properties ◽  
Retained Austenite ◽  
Mechanical Stability ◽  
Microstructure And Mechanical Properties ◽  
Cold Rolled ◽  
Partitioning Time ◽  
Evolution Of Microstructure

Q&P annealing cycles with different partitioning conditions were performed on cold rolled 0.2C-2.22Mn-1.44Si-0.21Cr steel. An important influence of partitioning temperature and time on the evolution of retained austenite fraction was shown through the saturation magnetization measurements. Such effect of partitioning conditions was also observed on the evolution of mechanical behavior. The evolution of microstructure and mechanical properties with the partitioning conditions was analyzed. Mechanical stability of retained austenite as a function of partitioning time was also assessed. Finally, modeling of the obtained stress-strain curves was performed and some explanations of the observed tendencies between partitioning conditions and tensile properties were proposed.

Ultrafine-grain formation and improved mechanical properties of novel extruded Ti-Fe-W alloys with complete solid solution of tungsten

2021 ◽  
Vol 875 ◽  
pp. 160031
Author(s):  
Abdollah Bahador ◽  
Junko Umeda ◽  
Ridvan Yamanoglu ◽  
Astuty Amrin ◽  
Abdulaziz Alhazaa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Ultrafine Grain ◽  
Complete Solid Solution ◽  
Grain Formation

An EBSD Study on Orientation Effects during Recrystallization of Coarse-Grained Niobium

2004 ◽  
Vol 467-470 ◽  
pp. 519-524 ◽  
Author(s):  
Hugo Ricardo Zschommler Sandim ◽  
Dierk Raabe
Keyword(s):  
Longitudinal Section ◽  
Primary Recrystallization ◽  
Coarse Grained ◽  
Subgrain Structure ◽  
Electron Backscattered Diffraction ◽  
Subgrain Growth ◽  
Metallographic Inspection ◽  
Cold Rolled ◽  
Cold Worked ◽  
Viable Mechanism

The recrystallization behavior of coarse-grained niobium depends on the nature of its deformation microstructure. In this regard, a longitudinal section of a high-purity coarse-grained niobium ingot was cold rolled to a thickness reduction of 96% followed by annealing in vacuum at 800°C for 1 h. Metallographic inspection in cold-rolled and annealed specimens was carried out in a field emission gun scanning electron microscope (FEG-SEM). Microtexture was determined by electron-backscattered diffraction (EBSD) coupled to the FEG-SEM. The use this technique has evidenced details of the boundary character and subgrain structure found in partially recrystallized regions. The early stages of primary recrystallization are associated to the presence of high-angle lamellar boundaries found in the cold-worked state. Abnormal subgrain growth has been evidenced as a viable mechanism for nucleation of recrystallization.

scholarly journals Plastic Stability of Retained Austenite in the Cold-rolled 0.14%C-1.9%Si-1.7%Mn Sheet Steel.

1995 ◽  
Vol 35 (9) ◽  
pp. 1121-1127 ◽  
Author(s):  
Atsushi Itami ◽  
Manabu Takahashi ◽  
Kosaku Ushioda
Keyword(s):  
Retained Austenite ◽  
Sheet Steel ◽  
Plastic Stability ◽  
Cold Rolled
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