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Ultrafine microstructure in microalloyed steel by a new thermomechnical process

Journal of University of Science and Technology Beijing 2002年第2期9卷 114-117页

作者： yuanliwang YonglinKang 等 DepartmentofMaterialsPhysicsandChemistry UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofMetalFOrming UniversityofScienceandTechnologyBeijingBeijing100083

Low carbon microalloyed steel containing 0.062 percent C, 2.34 percent Mn,0.044 percent Nb, 0.029 percent Ti, 0.032 percent V in mass fraction and small amount of B wasprepared in laboratory. Slabs of the steel were rolled into plates of 6mm in thickness followed byaccelerated cooling. The plates possess very high yield strength and reasonable ductility, and theyield ratio is about 0.8. Ultra-fine ferrite structure with micrometer dimension was observed in thesurface layer of the plates. Moreover, the effect of the finishing rolling temperature on the finalmicrostructure and formation mechanism of ultra-fine ferrite as well as the gamma->alphatransformation behavior of the steel was discussed.

关键词： microalloyed steel gamma->alpha transformation grain refinement microstructure boron-containing steel

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Grain refinement of low carbon steel produced by CSP process

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Journal of University of Science and Technology Beijing 2004年第2期11卷 133-137页

作者： XiangdongHuo DeluLiu yuanliwang NanjingChen YonglinKang JieFu MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijing100083BeijingChina MetallurgicalandEcologicalEngineeringSchool UniversityofScienceandTechnologyBeijing100083BeijingChina

In comparison with conventional production for hot strips, compact strip production (CSP) brings about some new micro-structural phenomena. Investigations were carried out to clarify the grain refinement mechanism of low carbon steel strips produced by the EAF-CSP process. Samples, obtained from the same rolling stock during continuous rolling, were examined through SEM, TEM and XEDS. Thin slabs have a dominant columnar structure and the spacing of the secondary dendrite arms ranges from 90 to -125 μm. The average grain sizes for the central area of the samples from the 1st to 6th pass are 41.6, 25.2, 21.4, 20.2, 13.1, 6.7 μm, respectively. Large number of nanometer oxide and sulfide have been found in the low carbon steel produced by the CSP process. The grain refinement mechanism can be summarized as follows: finer solidification structure of the thin slab; austenite recrystalliza-tion at higher temperature and stain accumulation at lower temperature caused by the great reduction of single rolling pass during continuous rolling; nano-scaled precipitates of sulfide and oxide which drag grain boundaries of austenite or ferrite to prevent the grain coarsening.

关键词： low carbon steel hot strips CSP process microstructure evolution grain refinement

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Influence of copper on quality of hot strips by EAF-CSP process

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Journal of University of Science and Technology Beijing 2004年第1期11卷 57-61页

作者： yuanliwang DeluLiu WeiranShao JieFu YonglinKang DeguangZhou ZhongbingWang MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China MetallurgicalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China GuanzhouZhujiangIronandSteelCo.Ltd. Guangzhou510620China

Electron microscopy and X-ray Energy Dispersive Spectroscopy (XEDS) study oninfluence of Cu on low carbon hot strips produced by CSP (Compact Strip Production) process has beencarried out. The results indicated that copper segregation and enrichment at interfacial layerbetween oxidized surface and steel matrix is the key factor, which results in microcracks and edgeflaws on the strips. The primary considerations to prevent detrimental effects from Cu includecontrolling copper content in proper level, higher soaking temperature and non-oxidizable atmosphereduring soaking. Copper sulfide precipitates with nanometers in size were observed, they may bebeneficial to the properties of CSP products, and influence of Cu on quality of CSP hot strips isdiscussed.

关键词： Cu segregation surface flaws CSP hot strips copper sulfide nano-scaledprecipitates

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