Modification for prediction model of austenite grain size at surface of microalloyed steel slabs based on in situ observation

Fu, Dachao; Wen, Guangrui; Zhu, Xueqin; Guo, Jianhua; Tang, Ping

doi:10.1007/s42243-020-00513-x

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…Liu et al carried out a comparative analysis of the transformation behavior of acicular on the surface and inside of low-carbon manganese steel [22]. Fu et al modified the prediction model of austenite grain size on the surface of micro-alloy billets based on results of in situ observation [23]. In situ observation is more and more widely used in the field of steel materials, but mostly to observe changes in microstructure, and rarely combined with the characterization of properties for analysis and research.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ti/N Ratio on Coarse-Grain Heat-Affected Zone Microstructure Evolution and Low-Temperature Impact Toughness of High Heat Input Welding Steel

Liu,

Wang,

et al. 2023

Coatings

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Coarse-grain heat-affected zone (CGHAZ) properties of steel deteriorate when it is welded using high heat input, which always restricts the promotion and use of high heat input welding steel. TiN particles significantly inhibit the growth of austenite and improve the microstructure and properties of high heat input welding steel. Effects of different Ti/N ratios on the CGHAZ microstructure and properties of high heat input welding steel were studied using welding thermal simulations and in situ observations. Results showed that a higher Ti/N ratio led to the abnormal growth of austenite grains and promoted the nucleation and growth of lath ferrite, which made the microstructure of the CGHAZ heterogeneous. In contrast, austenite grains were more uniform at a lower Ti/N ratio. Thus, the microstructure was refined, the brittle structure was reduced, and the properties of the CGHAZ were improved. In addition, when Ti/N = 5.85, the impact absorption energy of the CGHAZ obviously fluctuated. However, when Ti/N = 2.82, the impact absorption energy of the CGHAZ was higher and more stable. These results provided a new idea for the development of high heat input welding steel based on TiN theory.

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Section: Introductionmentioning

confidence: 99%

Effects of Ti/N Ratio on Coarse-Grain Heat-Affected Zone Microstructure Evolution and Low-Temperature Impact Toughness of High Heat Input Welding Steel

Liu,

Wang,

et al. 2023

Coatings

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show abstract

“…When the temperature drops to the temperature of austenite transformation completion (Tγ), the austenite begins to grow rapidly and finally forms coarse austenite grains with sizes above 1 mm during the solidification of peritectic steel, which are usually called 'blown grains' (BG) [1,2]. BG will decrease the ductility of the slab surface and promote crack propagation, which is an important reason for the formation of transverse corner cracks during the straightening process of slabs [3][4][5][6][7][8]. Therefore, eliminating BG during the solidification of peritectic steel has become the key factor in controlling the transverse corner crack.…”

Section: Introductionmentioning

confidence: 99%

Nb–Ti composite precipitation behaviour and its effect on the growth of austenite grains in peritectic steel

Cai

Cheng

et al. 2022

Ironmaking & Steelmaking

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Refinement of solidification austenite grains is an important way to control the transverse corner cracks. In the present work, the effect of Ti-Nb carbonitride on the refinement of solidification austenite grains is studied by laboratory experiments. Then, the precipitation temperature of Nb-Ti carbonitride is analysed by establishing a thermodynamic model. The results show that the austenite diameter decreases slowly from 1.45 to 1.16 mm (without Ti addition) and significantly decreases from 0.84 to 0.21 mm (with 0.02 wt-% Ti addition) with the Nb content varying from 0.03 to 0.09 wt-%. The pinning pressure provided by composite precipitation greatly increases with 0.02 wt-% Ti addition. The thermodynamic model of Nb-Ti carbonitride shows that the precipitation temperature of (Nb, Ti)(C, N) increases by approximately 20°C compared to Nb(C, N), which is the main reason for the increase in the pinning pressure.

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Dissolution of SiO2 Inclusions in CaO-SiO2-Based Slags In Situ Observed Using High-Temperature Confocal Scanning Laser Microscopy

Ren

Zhu

Ren

et al. 2022

Metall Mater Trans B

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Modification for prediction model of austenite grain size at surface of microalloyed steel slabs based on in situ observation

Cited by 11 publications

References 19 publications

Effects of Ti/N Ratio on Coarse-Grain Heat-Affected Zone Microstructure Evolution and Low-Temperature Impact Toughness of High Heat Input Welding Steel

Effects of Ti/N Ratio on Coarse-Grain Heat-Affected Zone Microstructure Evolution and Low-Temperature Impact Toughness of High Heat Input Welding Steel

Nb–Ti composite precipitation behaviour and its effect on the growth of austenite grains in peritectic steel

Dissolution of SiO2 Inclusions in CaO-SiO2-Based Slags In Situ Observed Using High-Temperature Confocal Scanning Laser Microscopy

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