Abstract
This paper investigates the formation mechanism of typical hypoeutectoid steel with longitudinal cracks produced on a caster with billet and slab. It was found that the microstructure of the proeutectoid ferrite is the most critical factor affecting the longitudinal crack. The formation conditions of the proeutectoid ferrite and the reasonable control direction were determined through experiments and calculations. High-temperature tensile experiments revealed that enhanced cooling did not cause additional cracks. Therefore, the final plan was to reduce the formation of proeutectoid ferrite by strengthening the cooling process. As a result, the optimized surface temperature quickly passed the phase transition region of the proeutectoid ferrite and no cracks were found in the optimized billet.
Highlights
In the industrial continuous casting (CC) process, the probability of surface cracking is high, which affects the quality of the product and the rhythm of production, and increases the production cost of steel [1,2]
Many small longitudinal cracks appear on the surface of a billet when producing 42CrMo1-08
The stress tends to accumulate on the ferrite film
Summary
In the industrial continuous casting (CC) process, the probability of surface cracking is high, which affects the quality of the product and the rhythm of production, and increases the production cost of steel [1,2]. Control of cracks formation is currently a crucial issue, as industry engineering develops rapidly [3]. Wang et al [14] analyzed the effect of inclusions on the initiation of cracks. Ma et al [3] investigated the effects of precipitates and pro-eutectoid ferrite on surface cracks in micro-alloyed steel. Li et al [17] analyzed the effect of subsurface microstructure evolution on the transverse crack of micro-alloyed steel. Kong et al [11] predicted the formation of cracks by using mathematical model
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