PCパーマロイの熱間延性に及ぼす微量成分の影響

概要

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The effects of segregation elements and precipitation elements on the hot-ductility of laboratory melted PC Permalloy were investigated by high temperature tensile test. A mechanism of deterioration of the hot-ductility of PC Permalloy has been also discussed. Decrease in S didn't improve the hot-ductility markedly. Addition of 0.002〜0.004% B with 2〜3 ppm S was effective on improving the hot-ductility while 0.004% B added alloy with 16〜18 ppm S showed a ductility trough. Ca added alloy with 18 ppm S showed good hot-ductility and the addition of Mg also improved the hot-ductility. It was suggested by Auger Electron Spectroscopy that hot-ductility was greatly affected by S segregation at grain boundary. The mechanism of improvement in the hot-ductility of PC Permalloy by the addition of B was thought to be attributed to the effect of site-competition segregation effect of B and S at grain boundary. Improvement of hot-ductility by the addition ofCa and Mg were thought to be related with the formation of sulfides which were stable below solidus temperature of PC Permalloy.