Okusima R
Aichi Gakuin Daigaku Shigakkai Shi. 1989 Mar;27(1):37-59.
The influence of the different casting conditions on mechanical properties of castings was investigated for two kinds of Ni-Cr alloys, pure gold and pure silver by means of tensile strength tests, fractography, microstructural observation and EPMA. The casting rates of Ni-Cr alloy castings increased as the casting temperature increased. On the other hand mechanical properties worsened as the casting temperature increased. The same phenomena were observed in the case of pure gold and pure silver. These worsened mechanical properties seemed to be caused by a decrease of intergranular coherence and an increase of porosity in the Ni-Cr alloys and pure silver. Furthermore, in the case of pure silver, identical causes were responsible for the worsened mechanical properties following the rise in casting pressure and mold temperature. But in the case of pure gold, worsened mechanical properties seemed to be caused by the growth in grain size. Therefore, the best mechanical properties were obtained when the controlled temperature was at the liquid point or at the melting point.
通过拉伸强度试验、断口分析、微观结构观察和电子探针微区分析（EPMA），研究了不同铸造条件对两种镍铬合金、纯金和纯银铸件力学性能的影响。镍铬合金铸件的铸造速率随铸造温度的升高而增加。另一方面，力学性能随铸造温度的升高而变差。在纯金和纯银的情况下也观察到了相同的现象。这些力学性能的恶化似乎是由于镍铬合金和纯银中晶间结合力的降低和孔隙率的增加所致。此外，在纯银的情况下，铸造压力和模具温度升高后力学性能恶化的原因相同。但在纯金的情况下，力学性能的恶化似乎是由于晶粒尺寸的增大所致。因此，当控制温度处于液相点或熔点时，可获得最佳的力学性能。
