Ferrite Grain Size Distributions in Ultra-Fine-Grained High-Strength Low-Alloy Steel After Controlled Thermomechanical Deformation

2011 ◽  
Vol 42 (9) ◽  
pp. 2575-2590 ◽  
Author(s):  
S. Patra ◽  
S. Roy ◽  
Vinod Kumar ◽  
A. Haldar ◽  
D. Chakrabarti
Keyword(s):  
Grain Size ◽  
Alloy Steel ◽  
High Strength ◽  
Size Distributions ◽  
Low Alloy Steel ◽  
Fine Grained ◽  
Thermomechanical Deformation ◽  
Grain Size Distributions ◽  
Ferrite Grain Size

Changes in Grain Size Distribution of a Submicron Grained Al-Sc Alloy during High Temperature Annealing

2006 ◽  
Vol 519-521 ◽  
pp. 1617-1622 ◽  
Author(s):  
N. Burhan ◽  
Michael Ferry
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Elevated Temperatures ◽  
Large Fraction ◽  
Direct Consequence ◽  
Size Distributions ◽  
Grain Coarsening ◽  
Fine Grained ◽  
Grain Size Distributions

Severe plastic straining is an established method for producing submicron grain (SMG) structures in alloys. However, the development of such a fine grained structure in single-phase alloys is usually futile if they are to be exposed or processed at elevated temperatures. This is a direct consequence of the natural tendency for rapid and substantial grain coarsening which completely removes the benefits obtained by grain refinement. This problem may be avoided by the introduction of nanosized, highly stable particles in the metal matrix. In this work, a SMG structure was generated in an Al-0.3 wt.% Sc alloy by Equal Channel Angular Pressing (ECAP). The alloy was prepared initially to produce a fine grained microstructure exhibiting a large fraction of high angle grain boundaries and a dispersion of nanosized Al3Sc particles. The evolution of microstructure during annealing at temperatures up to 550 °C was examined in detail and grain size distributions generated from the data. It was shown that grain coarsening is rapid at temperatures above 450 °C and the initial log-normal grain size distribution exhibiting low variance and skewness was altered considerably. The statistical information generated from the grain size distributions confirms that discontinuous grain coarsening occurs in this alloy only at temperatures greater than 500 °C.

Effect of Prior Austenite Microstructure on Austenite/Ferrite Transformation of Fine Grained High Strength Low Alloy Steel

2003 ◽  
Vol 426-432 ◽  
pp. 1583-1588
Author(s):  
Yang H. Bae ◽  
Soon Hyung Hong ◽  
Jae Sang Lee ◽  
Jong Kyo Choi ◽  
Woong Yong Choo
Keyword(s):  
Alloy Steel ◽  
Prior Austenite ◽  
High Strength ◽  
Low Alloy Steel ◽  
Fine Grained ◽  
Ferrite Transformation

Modeling Ferrite Grain Size Distributions during the Transformation of Hot Worked Austenite

2005 ◽  
Vol 500-501 ◽  
pp. 403-410
Author(s):  
R. Zubialde ◽  
Beatriz López ◽  
J.M. Rodriguez-Ibabe
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Carbon Steels ◽  
Microalloyed Steels ◽  
Size Distributions ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Grain Size Distributions ◽  
Ferrite Grain Size

A model has been developed to predict the ferrite grain size distribution resulting after the austenite to ferrite transformation in slowly cooled low carbon steels. The model uses the austenite grain size distribution present before transformation as input and provides the size distribution of ferrite grains at any instant in the transformation range, whether the microstructure is partially either completely transformed. The model is based on empirical equations relating the mean austenite and ferrite grain sizes and log-normal shape grain size distributions. A validation of the model was carried out in the laboratory by torsion tests for Nb and Nb-V microalloyed steels.

Sign in / Sign up

Export Citation Format

Share Document