| 摘要 |
PURPOSE:To manufacture a high-strength low-expansion Fe-Ni alloy by applying, required times, plastic working and annealing to an ingot having a specific composition consisting of Ni, Co, Mn, Si, Be, and Fe and further subjecting the above to specific heat treatment and aging. CONSTITUTION:Raw materials consisting of, by weight, 30-50% Ni, <=2.0% Co, 0.1-0.8% Mn, <=0.5% Si, 0.05-2.0% Be, and the balance Fe with inevitable impurities are blended, and subjected to vacuum melting in an atmosphere of Ar gas, etc. The resulting ingot is repeatedly subjected to plastic working and annealing treatment at about 800-1100 deg.C until the desired shape is reached. After the final plastic working, the worked material is heat-treated at a temp. in the region of 300-700 deg.C, preferably, for <= about 5hr and aged. By this method, the high-strength low-expansion Fe-Ni alloy excellent in hardness, tensile strength, and bendability, having high deformation resistance, and showing low coefficient of expansion close to that of a silicon element can be obtained.. |
