Analysis of sulfide distribution and segregation behavior in SAE1144 steel cast slab
WANG Yi1,2, LI Zhi-wei1,2, XU Xiang-yu1,2, ZHANG Zhi-ming3, ZHOU Nan3, FU Jian-xun1,2
1. Advanced Solidification Technology Center, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. State Key Laboratory of High-quality Special Steel Metallurgy and Preparation, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 3. Manufacturing Department, Guangdong Shaogang Songshan Co., Ltd., Shaoguan 512123, Guangdong, China
Abstract:Abstract: SAE1144 is a typical medium-carbon and high-sulfur free-cutting steel. The morphology, size, spatial distribution and segregation of sulfides in the steel are the key factors that affect the performance of its products. In this experiment, a sample of SAE1144 continuous casting slab produced by a domestic factory was used to analyze the sulphide morphology using characterization methods such as metallographic microscope, scanning electron microscope, and three-dimensional inclusion etching technology, change law of sulfide type, spatial distribution and three-dimensional morphology in the cast slab was analyzed, and the law of sulfur segregation was summarized. It is found that the type of sulfide in SAE1144 cast slab is mainly manganese sulfide inclusions, and the sulfide in the chilled layer is mainly a single ellipsoidal sulfide. The sulfide in the columnar crystal region is mainly a single type sulfide, and the sulfide in the central equiaxed dendrite crystal region are mainly cluster-shaped, chain-shaped and single-type sulfides. The maximum segregation value at the center of SAE1144 cast slab is 1.30. The enrichment of micro-segregation for sulfur elements in the primary dendrite and secondary dendrite leads to the macro-distribution segregation of MnS. The presence of aggregated large particles of MnS is a reflection of SAE1144 sulfur segregation, and it is also an important quality bottleneck restricting product performance.
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