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Influence of Cooling Parameters on the Microstructure and Primary Carbide Precipitation in GCr15 Steel
Steel Research International ( IF 1.9 ) Pub Date : 2021-06-05 , DOI: 10.1002/srin.202100208 Dongbin Jiang 1 , Lifeng Zhang 2
Steel Research International ( IF 1.9 ) Pub Date : 2021-06-05 , DOI: 10.1002/srin.202100208 Dongbin Jiang 1 , Lifeng Zhang 2
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With the high temperature confocal laser scanning microscope applied, the effect of cooling rate, temperature interval, and cooling mechanism on the solidification microstructure and primary carbide participation in GCr15 steel are investigated. The solute distribution in interdendritic segregation and participation carbide are analyzed by electron probe microanalysis. The results show that solute concentrate is low in the dendrite zone but it increases clearly in the segregation zone. The carbon concentration in the precipitation can reach 6.49%, which means the primary carbide is M3C. In the heating process, the segregation zone and carbide participation melt first before it reaches the solidus temperature. During the solidification stage, the microstructure is refined and the size of primary carbide is reduced with a higher cooling rate, but the number density of primary carbide is increased. Moreover, it is found that the microstructure is formed in the earlier solidification, before the temperature declines to 1673 K. While the primary carbide participates in the later cooling stage and the transition temperature for the primary carbide is 1503 K. In addition, the primary carbide size can be reduced with the cooling rate larger than 300 K min−1 in the subsequent cooling stage.
中文翻译：
冷却参数对GCr15钢组织和一次碳化物析出的影响
应用高温共聚焦激光扫描显微镜，研究了冷却速度、温度间隔和冷却机制对GCr15钢凝固组织和初生碳化物参与的影响。采用电子探针显微分析法分析了枝晶间偏析和参与碳化物中的溶质分布。结果表明，枝晶区溶质浓度低，偏析区溶质浓度明显增加。沉淀中的碳浓度可达6.49%，即初生碳化物为M 3C、在加热过程中，偏析区和碳化物参与在达到固相线温度之前先熔化。在凝固阶段，随着冷却速度的提高，显微组织细化，初生碳化物尺寸减小，但初生碳化物的数量密度增加。此外，发现显微组织形成于早期凝固，在温度下降到 1673 K 之前。而初级碳化物参与后期冷却阶段，初级碳化物的转变温度为 1503 K。此外，初级碳化物的转变温度为 1503 K。在随后的冷却阶段，冷却速度大于 300 K min -1可以减小碳化物尺寸。
更新日期：2021-06-05
中文翻译：
冷却参数对GCr15钢组织和一次碳化物析出的影响
应用高温共聚焦激光扫描显微镜，研究了冷却速度、温度间隔和冷却机制对GCr15钢凝固组织和初生碳化物参与的影响。采用电子探针显微分析法分析了枝晶间偏析和参与碳化物中的溶质分布。结果表明，枝晶区溶质浓度低，偏析区溶质浓度明显增加。沉淀中的碳浓度可达6.49%，即初生碳化物为M 3C、在加热过程中，偏析区和碳化物参与在达到固相线温度之前先熔化。在凝固阶段，随着冷却速度的提高，显微组织细化，初生碳化物尺寸减小，但初生碳化物的数量密度增加。此外，发现显微组织形成于早期凝固，在温度下降到 1673 K 之前。而初级碳化物参与后期冷却阶段，初级碳化物的转变温度为 1503 K。此外，初级碳化物的转变温度为 1503 K。在随后的冷却阶段，冷却速度大于 300 K min -1可以减小碳化物尺寸。
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