アルミニウムとステンレス鋼の衝撃圧接 : 接合部への表面粗さの影響と化合物層の生成機構の検討(<特集>衝撃)

概要

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An aluminum projectile was impact-welded on a stainless steel target using a nitrogen gas gun at impact velocity over 250m/s. The effect of surface roughness at the impact face of the target on the bonding area was examined using scanning acoustic tomography, and the strength of the bonding area was evaluated by a tension test. The microstructure and element distribution in aluminum/stainless steel joint were analyzed by means of a scanning electron microscope and energy dispersive X-ray spectroscopy(EDX). The experimental results of the concentrations of elements in the compound layer at the interface were compared with those obtained by a simple theoretical analysis. The following results were obtained. The bonding area of the joints increased with the decrease of surface roughness. However, the increment of the bonding area due to the decrease of surface roughness hardly influenced the bonding strength. The thickness of the compound layer increased with impact velocity. In addition, the area of uniformly distributed elements in the layer extended with the increase in thickness of the layer. The concentrations of elements measured in the layer using EDX hardly varied with the impact velocity and were close to those of the theoretical result in which an equivalent heat was generated at the impact faces of a projectile and a target.
社団法人日本材料学会の論文
1998-01-15