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一种不需进行常规金相检验而用冷却曲线分析的新技术,已被福特公司开发并在生产中用于现场快速监控Essex铝-硅合金熔体。从含有不同原始铝晶粒和共晶硅熔体得到的冷却曲线利用微处理机进行数学分析。这种新技术通过冷却曲线进行微分及随后进行的相变区域积分这两种数学运算,得到监控熔体质量的峰值读数。一旦确立了足够的峰值读数与组织的关系,则可在不取金相试样的情况下预测任何熔体的铸造组织。
A new technique for analyzing cooling curves without routine metallurgical tests has been developed by Ford Motor Company and used in production to quickly monitor Essex aluminum-silicon alloy melts in the field. Mathematical analyzes were performed using a microprocessor from the cooling curves obtained from different raw aluminum grains and eutectic silicon melts. The new technique uses two mathematical calculations of the differential of the cooling curve followed by the integration of the phase change regions to obtain the peak readings for monitoring melt quality. Once a sufficient peak reading has been established in relation to the tissue, the cast structure of any melt can be predicted without taking a metallographic sample.