Abstract
In the continuous casting process, the shrinkage of the peritectic phase transition during the initial solidification process has an important influence on the surface quality of peritectic steel. The initial solidification process of 0.10C%, 0.14C%, and 0.16C% peritectic steels was observed in situ by a high temperature laser confocal microscope, and the contraction degree during initial solidification was characterized by surface roughness. The results showed that under the cooling rate of 20 °C/s, the surface roughness value Ra(δ/γ) of 0.10C% peritectic steel was 32 μm, the Ra(δ/γ) value of 0.14C% peritectic steel was 25 μm, and the Ra(δ/γ) value of 0.16C% peritectic steel was 17 μm. With increasing carbon content, the contraction degree of the δ→γ transformation decreased, and the value of the surface roughness Ra(δ/γ) declined. Therefore, surface roughness can characterize the contraction degree of the δ→γ transformation in the initial solidification process of peritectic steel under the condition of a large cooling rate.
Highlights
The surface quality of hypo-peritectic steel has been a long-term research topic in continuous casting technology
The solidification process of 0.10C%, 0.14C%, and 0.16C% peritectic steels was observed in situ through a confocal scanning laser microscope (CSLM), and the value of surface roughness Ra(δ/γ), which is caused by the peritectic phase through a CSLM, and the value of surface roughness Ra(δ/γ), which is caused by the peritectic phase transition of the steel samples, was measured
During the solidification process of peritectic steel, the nucleation and growth of δ ferrite determines the surface morphology of the steel sample, and the surface roughness of the steel determines the surface morphology of the steel sample, and the surface roughness of the steel is is influenced by the shrinkage of the δ→γ transformation, the austenite to proeutectoid ferrite influenced by the shrinkage of the δ→γ transformation, the austenite to proeutectoid ferrite transformation, and the behavior of the eutectoid transformation
Summary
The surface quality of hypo-peritectic steel has been a long-term research topic in continuous casting technology. With increases in the productivity and hot-rolling rate, the surface cracks of hypo-peritectic steel slabs become stubborn defects that affect the production of continuous casting [7,8,9] It is of great scientific and practical significance to study the degree of shrinkage of the peritectic phase transition during the initial solidification of hypo-peritectic steel. Shibata et al [17] and Dippenaar et al [18] simulated the solidification process of peritectic steels using high-temperature laser confocal microscopy and studied the effect of the cooling rate on the peritectic transformation Their results indicated that the peritectic δ→γ transformation process was accompanied by the generation of surface wrinkles. It is hoped that the research results can provide boundary conditions for the calculation model to measure the quantitative relationship between the contraction degree of the peritectic phase transition and the surface roughness under a large cooling rate
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