A new technique for the injection of steel powder has been developed by CRM in order to enlarge the fraction of equiaxed crystals and to reduce the center-line segregation in as-cast products. The concept is to inject during solidification in the mould a fine steel powder through a Hollow Jet Nozzle designed by CRM.rnPreliminary tests performed on a cold simulator have helped to define the most suitable conditions for reaching a steel powder flow rate of 3 kg/min.rnSeveral campaigns with liquid steel carried out on CRM facilities have allowed casting at a sub-liquidus temperature when up to 1% of steel powder was added in the mould. The product examination has confirmed the effectiveness of the technique and highlighted the clear benefit gained by the powder injection. The new technique leads to a fully equiaxed solidification structure in the as-cast product and to an absence of centerline segregation.
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机译：CRM已开发出一种用于注射钢粉的新技术，以扩大等轴晶体的比例并减少铸态产品的中心线偏析。其概念是在固化过程中通过CRM设计的空心喷嘴在模具中注入细钢粉。rn在冷模拟器上进行的初步测试有助于确定最合适的条件，以达到3 kg / min的钢粉流量.rn在CRM设备上进行的多次液态钢运动允许在模具中添加高达1％的钢粉时在亚液相线温度下进行铸造。产品检查已经证实了该技术的有效性，并强调了粉末注射所获得的明显好处。新技术导致铸态产品中完全等轴的凝固组织，并且没有中心线偏析。
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