Strandman E
Odontol Revy. 1976;27(4):287-302.
The change in microstructure and hardness in a cast Co-Cr alloy (type A) with a carbon content of 0.45% was studied both when the alloy was aged at temperatures between 600 degree C and 1200 degrees C and when it was isothermically heat-treated at temperatures between 800 degrees C and 1000 degrees C after solubility treatment at 1200 degrees C. Furthermore, studies were undertaken on how aging at 800 degrees C, solubility treatment at 1200 degrees C and isothermal heat treatment at 800 degrees C after solubility treatment at 1200 degrees C affected the mechanical properties. The results showed that both aging and isothermal heat treatment could change both microstructure and hardness. The changes in the mechanical properties by heat-treatment, however, did not improve the usefulness of the alloy in dentistry, principally because the elongation was reduced. The change in microstructure explained the change in hardness and in mechanical properties. It was interesting to note that the properties of a Co-Cr alloy were not affected by heat-treatment at temperatures below 600 degrees C. This means that addition of gold alloys, which are soldered to a base of Co-Cr, can be both homogenised and/or hardened without affecting the properties of the Co-Cr alloy.
研究了碳含量为0.45%的铸造钴铬合金（A型）在600℃至1200℃之间时效时，以及在1200℃固溶处理后于800℃至1000℃之间进行等温热处理时的微观结构和硬度变化。此外，还研究了800℃时效、1200℃固溶处理以及1200℃固溶处理后800℃等温热处理对力学性能的影响。结果表明，时效和等温热处理均可改变微观结构和硬度。然而，热处理引起的力学性能变化并未提高该合金在牙科领域的实用性，主要是因为伸长率降低了。微观结构的变化解释了硬度和力学性能的变化。值得注意的是，钴铬合金在低于600℃的温度下进行热处理时性能不受影响。这意味着，焊接在钴铬基体上的金合金添加剂在不影响钴铬合金性能的情况下，既能实现均匀化又能硬化。
