W-Ni-Fe系焼結合金の動的材料特性に及ぼす熱処理効果

概要

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Effect of heat-treatment in vacuo and hydrogen on ductility and tensile strength of the sintered 95.5W-3.0Ni-1.5Fe and 9l.3W-5.8Ni-2.9Fe (by wt%) heavy alloys has been studied for a high strain rate, using high speed impact tension testing machine (a constant speed type). These materials were heated at 620-1200°C in hydrogen atmosphere and in vacuo for fixed time (about 9 hrs), respectively, and the mechanical properties of heat treated alloys were tested. A high speed uniaxial tensile test of these alloys was carried out to obtain the relation between tensile strength and tensile speed in a range up to 13 m/s. Also, strength and ductilities of these alloys have been measured. These experimental results seem to suggest that the dynamic tensile strength is larger than the static tensile strength. The elongation also seems to show lower than static one with tensile speed. The scanning electron micrographs of the fractured surfaces were also compared between the hydrogen treated specimens and the vacuum-treated specimens in order to examine the effect of hydrogen on fracture mode.
社団法人粉体粉末冶金協会の論文