6Cr13板坯连铸过程中初生碳化物的析出、生长和聚集行为,Steel Research International

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6Cr13板坯连铸过程中初生碳化物的析出、生长和聚集行为
Steel Research International ( IF 1.9 ) Pub Date : 2024-01-07 , DOI: 10.1002/srin.202300524
Shouhui Li ₁ , Jing Li ₁ , Jixiang Pan ₂ , Haixia Wei ₂ , Wei Yan ₁ , Shuang Zhu ₁ , Zhaoguo Li ₂ , Bin Xu ₂

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研究了6Cr13高碳马氏体不锈钢连铸板坯中一次碳化物的类型、分布、形貌、取向、生长和聚集机制。结果表明，在凝固末期，M ₇ C ₃碳化物从钢水中析出。板坯厚度方向初生碳化物面积分数从中心到边缘总体呈递减趋势。并且，越靠近中心区域，由于点状偏析缺陷的存在，碳化物分布的差异越大。在板坯1/8厚度和边缘处，快速的冷却速度和细小的枝晶使碳化物形态呈小脑状，聚集了大量的球状碳化物。在板坯1/4厚度处，块状、纤维状、球状碳化物依次析出，最终聚集在一起。在板坯中心的3/8厚度处，冷却速度较慢，点状偏析缺陷随机分布在该区域。非点偏析区碳化物形态多为小尺寸脑状。然而，合金元素是高度过饱和的，碳化物可以充分生长，在点偏析区域形成取向较少的大尺寸脑状碳化物。

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Precipitation, Growth, and Aggregation Behavior of Primary Carbides during Continuous Casting of 6Cr13 Slabs

The types, distribution, morphology, orientation, growth, and aggregation mechanism of primary carbides in the continuous casting slab of 6Cr13 high-carbon martensitic stainless steel are investigated. In the results, it is shown that M₇C₃ carbides precipitate from the liquid steel at the end of solidification. The area fraction of primary carbides in the slab thickness direction shows an overall decreasing trend from the center to the edge. And, the closer to the center region, the greater the difference in carbide distribution due to the presence of spot segregation defects. At 1/8 thickness and edges in the slab, the fast cooling rate and fine dendrites make the carbide morphology to be a small-sized brain like that aggregates a large number of spherical carbides. At 1/4 thickness in the slab, blocky, fibrous, and spherical carbides precipitate successively and eventually aggregate together. At 3/8 thickness and center in the slab, the cooling rate is slower and spot segregation defects are randomly distributed in this region. The carbide morphology is mostly small-sized brain like in the non-spot segregation region. However, the alloying elements are highly supersaturated and the carbides can grow sufficiently to form less oriented, large-sized brain-like carbide in the spot segregation region.

更新日期：2024-01-07

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