Ti-Ni形状記憶合金溶接部の形状回復及び引張特性に及ぼす酸素の影響 : Ti-Ni形状記憶合金のGTA溶接に関する研究(第1報)

概要

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Effects of oxygen on microstructure, shape recovery behavior and tensile properties were investigated for Ti-Ni shape memory alloy weldments. Gas tungsten arc (GTA) welding technique was applied for the alloy under controlled Ar-O_2 welding atmospheres. The oxygen content in the weld metal increased with rising oxygen partial pressure and welding current. Many second phase particles were observed in the weld metal which had absorbed oxygen. The second phase was identified as Ti_4 Ni_2O by transmission electron microscopy. Shape recovery behavior was measured for the temperature range of 283 to 372 K. The shape recovery stress of weldment at the 372 K gave equivalent value to that of the base material, however, As temperature of the weld metal decreased with increasing oxygen content. Tensile strength and elongation of the weldment decreased by welding and with increasing oxygen content.
社団法人溶接学会の論文
2000-05-05