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Vol.30, No.1, 82 ~ 90, 1992
Title
Influence of Small Mn Addition on Thermal Deformation and mechanical Properties in Fe - 36.5% Ni Invar Alloy
이종현J . H . Lee, 김희중H . J . Kim, 강일구I . K . Kang, 김학신H . S . Kim
Abstract
Behaviors of the thermal expansion, high temperature deformation and mechanical properties after vacuum annealing have been studied in Fe-36.5% Ni-(0.2∼0.6)% Mn Invar alloys. Regardless of the difference of Mn content, the thermal expansion coefficients are not changed and those at room temperature are below 10^(-6). The yield stress and the ultimate compressive stress at 1000℃ are not changed with Mn content while the peak strain continuously increases with Mn content. The yield stress at room temperature after annealing is slightly decreased with Mn content, and the lowest yield stress of 205. 8㎫ is obtained an alloy containing 0.48% Mn by annealing at 1200℃. At annealing of 1200℃ the yield stress and the ultimate tensile stress as well as the elongation show the lowest values and these are discussed as the combined effects of the grain growth, the amount of MnS and the development of cube texture.
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