Effect of Mold Cavity Design on the Thermomechanical Behavior of Solidifying Shell During Microalloyed Steel Slab Continuous Casting

Niu, Zhenyu; Cai, Zhuhua; Zhu, Miaoyong

doi:10.1007/s11663-021-02123-8

Cited by 11 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[6,7] For slab continuous casting, it has been reported that a higher cooling rate was adopted at the slab corners during the first phase transformation to control the corner microstructure. [9][10][11] Generally speaking, the appropriate cooling intensity and its even distribution on the continuous casting billet need to be controlled strictly. For example, some abnormal modes of nozzle distribution in billet continuous casters could lead to excessive cooling intensity around the billet corner that causes the initiation of corner cracks and high transverse thermal stress.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Tempered Sorbite Formation and Related Enhanced Mechanical Properties for a Typical High Carbon Steel Billet Under Strong Cooling Intensity

Wang

Zeng

Zhou

et al. 2021

Metall Mater Trans B

View full text Add to dashboard Cite

This article investigated the solidification structure evolution for a typical high-carbon steel billet under strong cooling intensity during the process of continuous casting. The results suggested that a regular solidification phase transformation route of 'austenite fi lamellar pearlite' was obtained in the center surface of billet; however, an abnormal microstructure evolution route of 'austenite fi martensite fi tempered sorbite (fine spheroidized cementite in the ferrite matrix)' appeared around the corner of billet. Besides, the secondary dendrite arm spacing for the center surface was 90.92 lm, and it reduced to 49.01 lm for the corner part because of different cooling conditions. In addition, the billet corner with a major tempered sorbite phase shows higher values of tensile strength, elongation and hardness, indicating sorbite phase could improve high carbon steel mechanical properties more significantly than the phase of lamellar pearlite because of its unique homogeneously distributed spheroidized structure. Furthermore, a laboratory experiment was conducted to verify the formation mechanism of tempered sorbite, and the results suggested that martensite phase would be formed around the billet corner under strong cooling intensity during the second cooling zone, and then the quenched martensite would be transferred to tempered sorbite, as the billet was out of the second cooling zone and reheated by its inner solidification heat.

show abstract