Journal ArticleDOI
Investigation on grain growth and strain rate sensitivity of a superplastic microduplex steel at 1000°C
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TLDR
In this paper, a microduplex stainless steel was investigated to examine grain growth during static annealing and superplastic deformation at 1000° C. The grain size at a constant strain rate of 1×10−4 sec−1 increases according to d∼8t 0.19e0.49 where d is the grain size and t is the time involved in deformation.Abstract:
A microduplex stainless steel (25.7 wt% Cr-6.6 wt% Ni) was investigated to examine grain growth during static annealing and superplastic deformation at 1000° C. The grain size at a constant strain rate of 1×10−4 sec−1 increases according to d∼8t
0.49 where d is the grain size and t is the time (in min) involved in deformation. Under the present test condition, the contribution of both static (time, t
S) and dynamic (strain, e) annealing appear to be significant and can be expressed by d∞
0.19e0.29. While the exponent of the first term is constant, the exponent of the second term may depend on the strain rate. Strain rate sensitivities were evaluated from differential strain rate tests for different initial grain sizes. Both strain rate sensitivity and grain size were noticed to increase with deformation.read more
Citations
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Journal ArticleDOI
Grain growth in a superplastic Zn-22% Al alloy
Oleg N. Senkov,M.M. Myshlyaev +1 more
TL;DR: In this article, the kinetics of grain growth in a Zn-22% Al alloy during static annealing and superplastic deformation (SPD) were studied.
Journal ArticleDOI
Microstructural aspects of superplasticity
TL;DR: The microstructural aspects of the superplastic phenomenon are reviewed in this article, where experimental results of a very large number of investigations are critically analysed in the context of: grain shape and size; grain growth; grain boundary sliding and migration, grain rotation and rearrangement; diffusion and dislocation activity.
Journal ArticleDOI
Superplasticity of steels and ferrous alloys
TL;DR: In this paper, the structural superplasticity of high and ultra-high carbon steels, low carbon low alloy steels and duplex stainless steels or alloys is examined.
Journal ArticleDOI
On the microstructure evolution in friction stir processed 2507 super duplex stainless steel and its effect on tensile behaviour at ambient and elevated temperatures
TL;DR: In this article, the microstructures and mechanical properties of friction stir processed 2507 super duplex stainless steel were examined and it was shown that there is an optimum traverse speed for a given rotational speed that gives minimum grain size.
Journal ArticleDOI
Strain rate sensitivity behavior of a structural steel during low-cycle fatigue investigated using indentation
TL;DR: In this paper, a series of experiments consisting of low-cycle fatigue, constant loading rate indentation, creep indentation experiments, optical microscopy examination, and transmission electron microscopy were performed to investigate the strain rate sensitivity behavior of SS400 structural steel under cyclic loading conditions.
References
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Journal ArticleDOI
Mechanical behavior and hardening characteristics of a superplastic Ti-6AI-4V alloy
Amit K. Ghosh,C. H. Hamilton +1 more
TL;DR: In this article, the deformation behavior of a superplastic Ti-6A1-4V alloy at 927°C has been characterized by means of constant strain-rate tensile tests up to large plastic strain.
Journal ArticleDOI
Deformation enhanced grain growth in a superplastic Sn-1% Bi alloy
M.A Clark,T.H Alden +1 more
TL;DR: In this article, the effect of superplastic deformation on the grain growth kinetics was studied using both constant crosahead speed and creep tests, the grain size was measured as a function of deformation time and strain over a wide range of strain rates.
Journal ArticleDOI
On the measurements of superplasticity in an Al-Cu alloy
G. Rai,Nicholas J. Grant +1 more
TL;DR: In this paper, the shape of the log stress-log strain rate curve for the Al-33 wt pct Cu eutectic alloy was examined and the inherent grain growth of the very fine grains which occurs during deformation, and the strain dependence of m at low strains, were shown to be the causes of the familiar shape of log stresslog strain curve for Al-Cu alloy.
Journal ArticleDOI
The deformation mechanisms of superplasticity
TL;DR: In this paper, the authors considered various deformation mechanisms for superplastic deformation and showed that grain boundary sliding is the major deformation mode, but the sliding rate should be governed by the lesser rate of dislocation creep within the grains.
Journal ArticleDOI
Microstructural influences on superplasticity in Ti-6AI-4V
N. E. Paton,C. H. Hamilton +1 more
TL;DR: In this article, the microstructure of two-phase α β alloys such as Ti-6A1-4V was evaluated in terms of their fully characterized microstructures.