Journal ArticleDOI
Hot deformation behavior and microstructure evolution of a stabilized high-Cr ferritic stainless steel
TLDR
In this article, a constitutive equation that well describes the flow stress as a function of strain, strain rate and temperature was developed, and the active dynamic restoration mechanism was found to depend on the Zener-Hollomon parameter.Abstract:
The hot deformation behavior and static microstructure evolution of a 21Cr stabilized ferritic stainless steel was studied using axisymmetric hot compression tests on a Gleeble 1500 thermomechanical simulator. The deformation was carried out at 950–1050 °C to strains of 0.2 to 0.6 using strain rates of 0.01, 0.1 and 1 s −1 . The compression was followed by a holding period of 0 to 180 s in order to study the static recrystallization kinetics. The electron backscatter diffraction (EBSD) technique was used in analyzing the resultant microstructures. A constitutive equation that well describes the flow stress as a function of strain, strain rate and temperature was developed. The active dynamic restoration mechanism was found to depend on the Zener–Hollomon parameter, such that continuous dynamic recrystallization was observed under low Zener–Hollomon parameter conditions but under high Zener–Hollomon parameter microstructures were dynamically recovered, and no dynamic formation of new grains occurred. Static recrystallization resulted in little or no grain refinement, and further, strain did not have an accelerating effect on the static recrystallization kinetics beyond the strain of 0.4.read more
Citations
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EBSD study of a hot deformed nickel-based superalloy
TL;DR: In this article, the authors investigated the evolution of hot deformed microstructures of a typical nickel-based superalloy by isothermal compression tests under the deformation temperature range of 920-1040°C and strain rate range of 0.001-1 s−1.
Journal ArticleDOI
EBSD analysis of evolution of dynamic recrystallization grains and δ phase in a nickel-based superalloy during hot compressive deformation
Yong-Cheng Lin,Dao-Guang He,Ming-Song Chen,Xiao-Min Chen,Chun-Yang Zhao,Xiang Ma,Zhi-Li Long +6 more
TL;DR: In this paper, the evolution of dynamic recrystallization (DRX) grains and δ phase, as well as the interactions between DRX grains and the phase were investigated.
Journal ArticleDOI
Effects of initial aging time on processing map and microstructures of a nickel-based superalloy
TL;DR: In this article, the effects of initial aging time on the processing map and microstructures are discussed in detail, and it is found that the processes are sensitive to the initial aging.
Journal ArticleDOI
DDRX and CDRX of an as-cast nickel-based superalloy during hot compression at γ′ sub-/super-solvus temperatures
TL;DR: In this paper, an as-cast nickel-based superalloy was investigated by uniaxial compression experiments performed at sub-solvus and super-susvus temperatures.
Journal ArticleDOI
Dynamic recrystallization behavior of GH4169G alloy during hot compressive deformation
TL;DR: In this article, the microstructure evolutions and nucleation mechanisms of GH4169 G alloy were studied by optical microscope, electron backscatter diffraction (EBSD) and transmission electron microscope (TEM).
References
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Journal ArticleDOI
Kinetics of Phase Change. I General Theory
TL;DR: In this paper, the theory of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered by previous treatment.
Journal ArticleDOI
Effect of Strain Rate Upon Plastic Flow of Steel
Clarence Zener,J. H. Hollomon +1 more
TL;DR: In this paper, an experiment was designed to check the equivalence of the effects of changes in strain rate and in temperature on the stress-strain relation in metal deformation.
Journal ArticleDOI
Constitutive analysis in hot working
H.J. McQueen,N.D. Ryan +1 more
TL;DR: In this paper, the effects of impurities and dispersoids on the constitutive equations for Al alloys are briefly discussed and compared with carbon, micro-alloyed, tool and stainless steels and to ferritic steels which usually do not exhibit DRX.
Journal ArticleDOI
A model of continuous dynamic recrystallization
S. Gourdet,Frank Montheillet +1 more
TL;DR: In this paper, a simple CDRX model is proposed, that deals with a set of "crystallites" delimited partly by lowangle (LABs) and partly by high-angle (HABs) boundaries.
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