V形環状切欠きを有する18Niマルエージ鋼の引張破壊

概要

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The effect of 60°V-type circumferential notch having various notch root radii on the fracture behavior under tension was investigated for a commercial 18Ni maraging steel. Regardless of notch root radius, the V-type notched specimens(as solution-treated) were found to fracture in a ductile manner and consequently to show cup and cone fracture, resulting in notch strengthening. On the other hand, in the solution-treated and aged specimens with V-type notch, the fracture mode was macroscopically brittle without producing notch weakening. However, the fracture surface was mostly cup and cone type as in the case of the as solution treated specimens. In both of the fracture surfaces mentioned above, the following tendency was found: the width of shear lip region in fracture surface increased with notch root radius, and the size of dimple found there was smaller than that in normal rupture region and decreased with decreasing notch root radius, while the size of dimple in normal rupture region remained almost unchanged with notch root radius. Discussions were finally made on these results on the basis of both distributions of stress and strain at notch by REM.
社団法人日本材料学会の論文
1984-10-15