軟鋼の衝撃破面に及ぼす衝撃速度の影響

概要

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A gun type impact testing machine was built as a trial, which could fracture a specimen at any velocity higher than the impact velocity of the Charpy impact test. The effect of impact velocity on the fracture surface of mild steel was studied by the electron fractography. The main results obtained are as follows. (1) The thickness of the dimple nucleation area at four edges of the fracture surface became thinner with increasing impact velocity. The dimples nucleation area on radial area decreased with the impact velocity. (2) The number of the dimple whose minor axis was smaller than 2μm increased with the impact velocity, but the number of the dimple whose minor axis was larger than 2μm was constant. (3) The nucleation rate of twins observable at the radial area increased, the nucleation rate of the river pattern at the edge of the cleavage facet decreased and the cleavage facet became larger with increasing impact velocity.
社団法人日本材料学会の論文
1979-06-15