The Influence of Crack Length on SCC Crack Growth Behavior of High-Strength Steel under Dynamic Loading Conditions
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概要
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The influences of crack length on the crack growth in stress-corrosion-cracking (SCC) of 523 K-tempered, high-strength steel, SCM435H (σ_B=1770MPa) immersed in a 3.5%NaC1 solution were investigated under dynamic loading conditions; static SCC under a sustained load, dynamic SCC under a sustained load with high frequency vibratory stresses superimposed, and cyclic SCC under low-frequency variation. Threshold values of static and dynamic SCC of short cracks, whose crack length from notch root, l, ranged from l.52mm to 2.81mm, were smaller than those of long cracks (l= 6.86 - 9.78mm). Dissolution of the fracture surface was more prevalent in short cracks than in long cracks, and a decrease in threshold values of short cracks is considered to be caused by increased hydrogen uptake at the crack tip associated with the accelerated dissolution of fracture surfaces compared to long cracks. Crack growth rates of short cracks (l ≲ 6.5mm) at the plateau region were also accelerated compared to those of long cracks (l > 6.5mm). Static SCC crack growth rates of long cracks were accelerated and the threshold value was lowered by deaeration of the solution. However, the deaeration had no influence on the crack growth rates of static SCC of short cracks. In the case of cyclic SCC at R =0.1, no influence of crack length (l > 1.18mm) on crack growth rates was observed. But at R=0.5, track growth rates of short cracks were accelerated compared to those of long cracks.
- 一般社団法人日本機械学会の論文
- 1990-10-15
著者
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SUGIYAMA Tadashi
Department of Pharmacy, Gifu University Hospital
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Komai Kenjiro
Department Of Mechanical Engineering Graduate School Of Engineering Kyoto University
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Minoshima Kohji
Department Of Mechanical Engineering Graduate School Of Engineering Kyoto University
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Semba T
Department Of Pharmacy Gifu University Hospital
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SUGIYAMA Tadashi
Sumitomo Electric Co.
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