Effect of Magnesium Addition on Behavior of Collision and Agglomeration between Solid Inclusion Particles on H13 Steel Melts

• Published in: Steel research international 2017-03, Vol.88 (3), p.1600185-n/a
• Main Authors: Du, Gang, Li, Jing, Wang, Zhong‐Bing, Shi, Cheng‐Bin
• Format: Article
• Language: English
• Subjects: Agglomeration; Alumina; Aluminum oxide; Chromium molybdenum vanadium steels; Clusters; collision; Die steels; Formations; H13 steel; Hot work tool steels; Inclusions; Magnesium; Melts; non‐metallic inclusion; Steel; Steels
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.201600185

Behavior of collision and agglomeration between solid inclusion particles MgO · Al2O3 and Al2O3 on H13 molten steel surfaces is observed in situ through a confocal scanning laser microscope (CSLM) equipped with a gold image furnace, and the attractive force between these solid inclusions is calculated by using Newton's second law. Results and analysis show that the attractive force between alumina particles in H13 steel without magnesium is stronger than that between MgO · Al2O3 particles in H13 steel containing magnesium, and the action radius of attractive force between alumina particles is larger than that between MgO · Al2O3 particles. MgO · Al2O3 particles have a much weaker tendency to collide, agglomerate, grow, and form clusters than alumina particles in H13 steel. Therefore, the collision, agglomeration and growth of inclusions, as well as the formation of clusters in H13 steel can be effectively impeded by the adding of magnesium. The formation sequence of MgO · Al2O3 cluster is the same as that of alumina cluster, but the MgO · Al2O3 clusters cannot form the outside branch and attract more distant particles. The collision, agglomeration and growth of inclusions, as well as the formation of clusters in H13 steel can be effectively impeded by the adding of magnesium.