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浇杯孕育工艺在西安柴油机厂试用成功以后,1973年3月曾在该厂的生产条件下,以295曲轴为对象,研究了不同硅铁孕育量对曲轴金相组织和常规机械性能的影响,总结成《浇杯孕育工艺对295球墨铸铁曲轴组织和机械性能的影响》一文。当时我们发现采用浇杯孕育工艺后,无论是铸态的或是热处理后,球墨铸铁曲轴的机械性能都有明显的提高(特别是冲击值)。1974年8月我们进一步发现采用这种孕育工艺后,其疲劳极限和负温冲击值也都有很好的性能。由于在295曲轴中加有0.72％铜,这就促使我们企图进一步弄清楚这些性能的提高是铜在起作用还是由于孕育工艺改进而获得。另外也想进一步了解最佳孕育值的数值是否随铸件的重量而改变。为此我们在原生产条件下,不加入铜重复进行了上次的试验。
After the successful trial of Xi’an Diesel Engine Factory, the casting cup birth process was studied in March 1973 under the production conditions of the factory. The 295 crankshaft was used as the research object to study the effect of ferrosilicon on the microstructure and mechanical properties of the crankshaft. Summarized as “pouring cup birth process on 295 ductile iron crankshaft organization and mechanical properties,” a text. At that time, we found that the mechanical properties of ductile iron crankshafts (especially the impact values) were significantly improved after cast-inoculation process, whether cast or heat treated. August 1974 We further found that using this inoculation process, its fatigue limit and negative temperature impact values also have good performance. As a result of the addition of 0.72% copper to the 295 crankshaft, this prompted us to attempt to further clarify whether the improvement in these properties is due to copper’s function or due to inoculation process improvements. Also want to know more about the best value of inoculation value with casting weight change. For this reason, we repeated the previous test without adding copper under the original production conditions.