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本文抓住影响铸造质量的关键步骤共晶凝固相析出的热效应,采用微分热分析法对蠕墨铸铁、球蠕混合组织、灰铸铁、硼铸铁、高磷铸铁和硼磷铸铁等做了系统试验和部分现场考验。 试验结果表明,用微分热分析法测试上述铸铁的微分冷却曲线,更好地揭示了共晶结晶规律。微分冷却曲线上的每一个峰值对应着一个新相开始析出、大量生长和凝固结束的整个过程,较清晰地显示出奥氏体初晶的数量、各种石墨形态,硼碳化物及磷共晶的析出和数量。这对我们判断和认识各种铸铁共晶凝固过程甚有帮助。 所制定的某些组织形态和数量及铸铁机械性能的判断图表,为实现快速质量控制和提高产品质量提供根据。
This paper grasps the thermal effect of the eutectic solidification phase, which is the key step of casting quality, and systematically tests the compacted thermal analysis of vermicular cast iron, spheroidal mixed structure, gray cast iron, boron cast iron, high phosphorus cast iron and boron phosphorous cast iron And part of the field test. The experimental results show that the differential cooling curve of the above cast iron is tested by differential thermal analysis to better reveal the eutectic crystallization rule. Each peak on the differential cooling curve corresponds to the entire process of a new phase starting to precipitate, mass growth and the end of solidification. It clearly shows the number of primary austenite grains, various graphite forms, boron carbides and phosphorus eutectic Precipitation and the number of. This is very helpful for us to judge and recognize all kinds of cast iron eutectic solidification process. The shape and quantity of certain organizations and the judgment charts of mechanical properties of cast iron have provided the basis for rapid quality control and product quality improvement.