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本文报导了在生产大断面球墨铸铁柴油机曲轴现场实测的热分析试验。对６３００和 ６３２０型大功率球墨铸铁曲轴所测的冷却曲线表明，在共晶平台温度和石墨球的大小之间 有更密切的对应关系。共晶平台温度越高，则最后得到的石墨球越少。并且，过冷度 （ＴＥＮ－ＴＥＵ）越大，则产生石墨畸变和晶间碳化物的程度也越严重。 热分析法是检验大断面球墨铸铁曲轴工艺合理性的有效方法。 扫描电子显微镜研究表明，晶间碳化物的沉淀析出，是与银、磷等元素的偏析有 关。
This paper reports the thermal analysis of the crankshaft in the production of large section ductile iron diesel engine. The cooling curves measured for the 6300 and 6320 high-power ductile iron crankshafts show a closer correspondence between the eutectic temperature and the size of the graphite sphere. The higher the temperature of the eutectic platform, the less the graphite ball finally obtained. Further, as the degree of undercooling (TEN-TEU) increases, the degree of occurrence of graphite distortion and intergranular carbide also increases. Thermal analysis is an effective method to test the rationality of large-section ductile iron crankshaft. Scanning electron microscopy studies have shown that precipitation of intergranular carbides is related to the segregation of elements such as silver and phosphorus.