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Tetsuya Saito

Bio: Tetsuya Saito is an academic researcher. The author has contributed to research in topics: Corrosion & Corrosion fatigue. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

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TL;DR: Corrosion fatique crack growth rates as a function of the stress intensity factor range were investigated in the 3.5% NaCl aqueous solution of various temperatures between 278K and 333K under a constant applied electrochemical potential of -1050mV vs. Ag/AgCl reference electrode as mentioned in this paper.
Abstract: Corrosion fatique crack growth rates as a function of the stress intensity factor range were investigated in the 3.5% NaCl aqueous solution of various temperatures between 278K and 333K under a constant applied electrochemical potential of -1050mV vs. Ag/AgCl reference electrode. Generally speaking, crack growth is enhanced as solution temperature rises. The corrosion fatique crack growth rate-stress intensity factor range curve can be divided into three distinct stages independent of testing temperature; at low ΔK levels or Range I, corrosion fatigue crack growth rate is strongly dependent on ΔK and slightly on testing temperature. In the range of moderate ΔK or Range II, the extent of which depends on testing temperature, the ΔK dependence of the crack growth rate curves disappears and crack growth rate reaches a limiting value. The apparent activation energy for the rate limit region of Range II was found to be approximately 40.0kJ/mole, which can be compared well with that for apparent hydrogen diffusion in steel. At higher ΔK levels or in Range III, corrosion fatigue crack growth rates coincide with those obtained in ambient laboratory air, indicating that the corrosion fatigue crack growth in this range is not affected essentially by the aqueous environment.

3 citations


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TL;DR: In this article, a hot rolling of an aluminium-1% manganese alloy was carried out in two pass schedules, of either two forward passes or a forward and a reverse pass to the same overall net strain.
Abstract: Hot rolling of an aluminium–1% manganese alloy has been carried out. Wedge shaped specimens were rolled in two pass schedules, of either two forward passes or a forward and a reverse pass to the same overall net strain. Through thickness marker pins were inserted to allow the investigation of plastic flow during the different rolling schedules. The reversed rolling technique allowed the determination of the effect of a strain path change on the recrystallisation kinetics during hot rolling. Following subsequent annealing, quantitative metallography indicated that the forward–forward specimens showed faster recrystallisation kinetics than the forward–reverse specimens, and produced a finer recrystallised grain size following equivalent thermomechanical treatments differing only in strain path. A through thickness microstructural gradient was found in all materials.

10 citations

Journal ArticleDOI
TL;DR: In this article, the effects of friction on the heterogeneity of deformation during rolling through studies using plane strain (2D) and 3D finite element models designed to simulate the deformation of the embedded pin inserts during rolling.
Abstract: The paper investigates the effects of friction on the heterogeneity of deformation during rolling through studies using plane strain (2D) and three-dimensional (3D) finite element models designed to simulate the deformation of the embedded pin inserts during rolling. Redundant work due to friction is defined as a path function along the arc of contact. Since deformation during rolling is profoundly influenced by the amount of redundant work, which depends on friction as a path function along the arc of contact, the study has focused especially on methods of representing these frictional effects. The friction studied has been in one of two classes: the coefficient of friction being constant or varying parabolically along the arc of contact. The results show that the values of shear stress and normal pressure along the arc of contact depend upon the friction profile. The magnitude of these frictional effects is revealed by the through thickness variation of the relative pin insert displacement. This...

6 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of a single overload on the corrosion fatigue crack growth behavior of low alloy steel was examined and it was found that the retardation of the crack growth rate for a similar amount of overload is much greater in material in hardened-and-tempered conditions compared with the annealed condition.
Abstract: An investigation was carried out to examine the influence of a single overload on the corrosion fatigue crack growth behavior of a low alloy steel. Compact tension specimens with TL orientation prepared from AISI 4130 steel in two different heat-treated conditions were used. All specimens satisfied the test requirements of ASTM Standard E-647. The results of this investigation demonstrate that the retardation of the crack growth rate for a similar amount of overload is much greater in material in hardened-and-tempered conditions compared with the annealed condition. The retardation effect was found to increase with increasing Δϰ level. However, the retardation effect was found initially to decrease and to reach a minimum level, and then to start to increase again with increasing crack length. This retardation on corrosion fatigue crack growth rate due to single overload can be attributed to the crack-closure effect as a consequence of overload.

2 citations