ADI适宜碳硅量优化设计与控制

Design and Control of Suitable Carbon-Silicon Content of Austempered Ductile Iron

适宜碳硅含量是获得优质等温淬火球墨铸铁(ADI)的前提条件。分析研究了碳硅含量对ADI铸件凝固过程、奥氏体化过程、等温淬火过程及其组织的影响。结果表明,ADI铸件适宜碳硅含量范围较球墨铸铁更窄,一般为:3.4%~3.8%C、2.3%~2.7%Si;适宜碳硅含量、合理的孕育球化及等温淬火工艺是获得ADI理想微观组织及优异力学性能的关键。

Suitable carbon-silicon content is a prerequisite for obtaining high-quality ADI.We analyzed the effects of the carbon and silicon content on the microstructure of ADI castings in the processes of solidification,austenitization,and austempering.The results indicate that the suitable carbon and silicon content in ADI is 3.4%-3.8%C,2.3%-2.7%Si,respectively,which is narrower than that in ductile iron.The suitable carbon-silicon content and reasonable inoculating,spheroidizing,and austempering processes are the key to obtain ADI with ideal ausferritic microstructure and excellent mechanical properties.