용탕인출주조법으로 제조된 Fe-42Ni-Si 합금 판재의 열팽창 특성

Abstract

The thermal expansion property was investigated on Fe-42% Ni alloy strip, which was added by alloying element of Si of 0～1.5 wt.%, and was fabricated by a melt drag casting process. Addition of Si reduces concentration of O2 during melt drag casting, and increases the formability of a strip. The alloy with Si content of 0.6 wt.% showed the lowest thermal expansion ratio in the temperature range of 20～350°C, and the alloy with 1.5 wt.% Si showed higher thermal expansion ratio. The thermal expansion coefficient of cold rolled strip was decreased with higher reduction ratio and annealing temperature, which was caused by grain growth.