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Vol.26, No.9, 871 ~ 880, 1988
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| Title |
| Investigation of the Processing and Heat Treatment Parameters for Low - Expansion Fe - Ni ( X - Y ) Alloys Produced by a Powder Metallurgy method |
| 윤의한Eui Han Yoon, 황선근Sun Keun Hwang, 박원구Won Koo Park, 정형식Hyung Sik Chung, 류한춘Han Choon Ryu |
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| Abstract |
| The physical properties and mechanical properties of Fe-36∼41.5% Ni binary, Fe-41.5% Ni-(X) ternary and Fe-41.5% Ni-0.5% MnCO₃-(Y) quarternary alloys produced by die-compaction were studied. Following sintering and homogenization heat treatment underwent the experimental alloys cold working and annealing heat treatments in a temperature range of 720∼1150℃. The mean linear thermal expansion coefficient of the experimental alloys, α￣, showed a minimum within a temperature range of 20∼500℃. The minimum mean linear thermal expansion coefficient, α￣_(min), as well as the temperature corresponding to α￣_(min) of Fe-Ni binary alloys increased with nickel content. The temperature for α￣_(min) of Fe-41.5% Ni alloy increased with MnCO₃, Sn or Al addition. The effect of nickel content on the physical properties of the powder-processed materials were similar to those of ingot materials. Addition of MnCO₃in Fe-41.5% Ni alloy resulted in a sharp increase of the microhardness and the inflection temperature after 820℃ annealing. The mechanical properties of the experimental alloys were found to be sensitive to the inhomogeneities of the microstructure. |
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