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Vol.45, No.4, 209 ~ 216, 2007
Title
Thermal Expansion Properties of Fe-42Ni-Si Alloy Strips Fabricated by Melt Drag Casting Process
안용식 Yong Sik Ahn , 김문철 Moon Chul Kim , 김무겸 Moo Kyum Kim , 김용찬 Yong Chan Kim , 남궁정 Jeong Namkung
Abstract
Thermal expansion property was investigated on Fe-42% Ni alloy strip added by alloying element of Si of 0~1.5wt.%. The strip was fabricated by a melt drag casting process. Addition of Si enlarged the solid-liquid region and reduced the melting point which leads to the increase of the formability of a strip. The alloy containing 0.6wt.% Si showed the lowest thermal expansion ratio in the temperature range between 20 to 350℃. The grain size was increased with reduction ratio and annealing temperature, which resulted in the decrease of the thermal expansion coefficient of strip. Because of grain refining by precipitation of Ni3Fe, the alloy strip containing 1.5wt.% Si showed higher thermal expansion ratio compared with the alloy containing 0.6wt.% Si.
Key Words
thermal expansion ratio, melt drag casting, Fe-Ni Alloy, Si content
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