scholarly journals Effect of Grain Size Distribution on Recrystallisation Kinetics in an Fe-30Ni Model Alloy

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 369 ◽  
Author(s):  
Mo Ji ◽  
Claire Davis ◽  
Martin Strangwood
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Cold Deformation ◽  
Avrami Exponent ◽  
Model Alloy ◽  
Avrami Parameter ◽  
In Situ Heating

This paper discusses the role of grain size distribution on the recrystallisation rates and Avrami values for a Fe-30 wt. % Ni steel, which was used as a model alloy retaining an austenitic structure to room temperature. Cold deformation was used to provide uniform macroscopic strain distributions (strains of 0.2 and 0.3), followed by recrystallisation during annealing at 850–950 °C. It was shown that the Avrami parameter was directly related to the grain size distribution, with a lower Avrami exponent being seen for a larger average and wider grain size distribution. A method to predict the Avrami exponent from the grain size distribution was proposed. In situ heating in an SEM with EBSD showed the recrystallisation kinetics to be affected by differences in stored energy and nucleation in the different grain sizes supporting the proposed relationship.

scholarly journals Effect of Strain-Induced Precipitation on the Recrystallization Kinetics in a Model Alloy

2021 ◽  
Author(s):  
Mo Ji ◽  
Martin Strangwood ◽  
Claire Davis
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Avrami Exponent ◽  
Model Alloy ◽  
Size Distributions ◽  
Recrystallization Kinetics ◽  
Grain Size Distributions ◽  
Recrystallized Grain Size ◽  
Nb Addition

AbstractThe effects of Nb addition on the recrystallization kinetics and the recrystallized grain size distribution after cold deformation were investigated by using Fe-30Ni and Fe-30Ni-0.044 wt pct Nb steel with comparable starting grain size distributions. The samples were deformed to 0.3 strain at room temperature followed by annealing at 950 °C to 850 °C for various times; the microstructural evolution and the grain size distribution of non- and fully recrystallized samples were characterized, along with the strain-induced precipitates (SIPs) and their size and volume fraction evolution. It was found that Nb addition has little effect on recrystallized grain size distribution, whereas Nb precipitation kinetics (SIP size and number density) affects the recrystallization Avrami exponent depending on the annealing temperature. Faster precipitation coarsening rates at high temperature (950 °C to 900 °C) led to slower recrystallization kinetics but no change on Avrami exponent, despite precipitation occurring before recrystallization. Whereas a slower precipitation coarsening rate at 850 °C gave fine-sized strain-induced precipitates that were effective in reducing the recrystallization Avrami exponent after 50 pct of recrystallization. Both solute drag and precipitation pinning effects have been added onto the JMAK model to account the effect of Nb content on recrystallization Avrami exponent for samples with large grain size distributions.

Grain-size distribution in deforming subglacial tills: Role of grain fracture

Geology ◽  
1995 ◽  
Vol 23 (1) ◽  
pp. 57 ◽  
Author(s):  
Roger LeB. Hooke ◽  
Neal R. Iverson
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution

In-situ measurement of Ti-6Al-4V grain size distribution using laser-ultrasonic technique

2018 ◽  
Vol 154 ◽  
pp. 40-44 ◽  
Author(s):  
Feng Dong ◽  
Xiaochen Wang ◽  
Quan Yang ◽  
Huaqiang Liu ◽  
Dong Xu ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
In Situ Measurement ◽  
Ultrasonic Technique ◽  
Laser Ultrasonic

scholarly journals Linking flow-stream variability to grain size distribution of suspended sediment from a satellite-based analysis of the Tiber River plume (Tyrrhenian Sea)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
J. Pitarch ◽  
F. Falcini ◽  
W. Nardin ◽  
V. E. Brando ◽  
A. Di Cicco ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Suspended Sediment ◽  
Grain Size Distribution ◽  
Flash Floods ◽  
Sandy Sediment ◽  
Tyrrhenian Sea ◽  
Tiber River ◽  
The Impact

AbstractSeveral coastal regions on Earth have been increasingly affected by intense, often catastrophic, flash floods that deliver significant amounts of sediment along shorelines. One of the critical questions related to the impact of these impulsive runoffs is “are flash floods more efficient in delivering non-cohesive sandy sediment along the coasts?” Here we relate flow stages (i.e., from erratic to persistent) to the grain size distribution of the suspended load, by performing a synergic analysis of in-situ river discharge and satellite-retrieved grain size distribution, from 2002 to 2014, covering the 2012 Tiber River (Italy) exceptional flood event. Our analysis shows novel and promising results regarding the capability of remote sensing in characterizing suspended sediment in terms of grain size distribution and reveals that erratic stages favour delivering of non-cohesive sandy sediment more than the persistent stages. This conclusion is supported by numerical simulations and is consistent with previous studies on suspended sediment rating curves.

scholarly journals Effect of grain size distribution on Raman analyses and the consequences for in situ planetary missions

2013 ◽  
Vol 44 (6) ◽  
pp. 916-925 ◽  
Author(s):  
F. Foucher ◽  
G. Lopez-Reyes ◽  
N. Bost ◽  
F. Rull-Perez ◽  
P. Rüßmann ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Planetary Missions

The role of bimodal grain size distribution in nanocrystalline shape memory alloys

2018 ◽  
Vol 27 (10) ◽  
pp. 105004 ◽  
Author(s):  
Jakub Mikula ◽  
Siu Sin Quek ◽  
Shailendra P Joshi ◽  
David T Wu ◽  
Rajeev Ahluwalia
Keyword(s):  
Grain Size ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Bimodal Grain Size ◽  
Bimodal Grain Size Distribution
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