Phase Transition of Peritectic Steel Q345 and Its Effect on the Equilibrium Partition Coefficients of Solutes

Chen, Huabiao; Long, Mujun; Cao, Junsheng; Chen, Dengfu; Liu, Tao; Dong, Zhihua

doi:10.3390/met7080288

Cited by 15 publications

(2 citation statements)

References 19 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is referred to as the L þ γ zone. (See [9] for an in-situ account of the solidification phase transformation of a peritectic steel). The freezing range ∆T f is given as:…”

Section: Interdendritic Feeding 31 Solidification Characterisation Of Steelsmentioning

confidence: 99%

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Mahomed¹

2021

Casting Processes and Modelling of Metallic Materials

View full text Add to dashboard Cite

In this Chapter, shrinkage porosity defects in steel castings are analysed, particularly for low carbon, high alloyed steels, which have applications in critical engineering components. It begins with the mechanisms for porosity formation within the solidification contraction phase of the casting cycle, highlighting the importance of feeder design. This is followed by characterisation of the solidification phase of steel alloys, including the evolution of phases, which is important in distinguishing between microstructure and porosity in microscopy analysis. A more detailed discussion of interdendritic feeding and mechanisms for shrinkage micro-porosity is then provided. This leads to the well-established interdendritic flow model and commonly-used thermal criteria for shrinkage porosity prediction. The discussions are then consolidated through the classification of shrinkage porosity in terms of formation mechanisms and morphology, and its causes relating to composition, design and process conditions. Finally, engineering standards for classification and inspection of porosity types and severity levels in steel castings are discussed. Throughout, basic design and process improvement approaches for improving melt feeding during solidification contraction is given, with emphasis on providing practical solutions for prediction and evaluation of shrinkage porosity defects in castings.

show abstract

“…This is referred to as the L þ γ zone. (See [9] for an in-situ account of the solidification phase transformation of a peritectic steel). The freezing range ∆T f is given as:…”

Section: Interdendritic Feeding 31 Solidification Characterisation Of Steelsmentioning

confidence: 99%

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Mahomed¹

2021

Casting Processes and Modelling of Metallic Materials

View full text Add to dashboard Cite

show abstract

“…Peritectic reaction of steel is an important transformation mode of Fe-C alloy with a carbon content ranging from 0.10% to 0.53% in the initial stage of solidification [1][2][3][4]. When the primary high-temperature δ-ferrite reacts with the residual molten steel L to produce the γ-austenite, the difference in crystal structure between the δ phase (BCC structure) and the γ phase (FCC structure) results in a large volume contraction in the process of solidification, which causes uneven cooling of the primary shell in the mold, thus forming shells with different thicknesses and high cracking susceptibility [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium Treatment on the Hot Ductility of Ti-Bearing Peritectic Steel

Wang

et al. 2020

Metals

View full text Add to dashboard Cite

Surface cracking is a major defect in the production of continuous casting slabs of peritectic steel. The difference in crystal structure between δ phase (before peritectic transformation of steel) and γ phase (after peritectic transformation) results in volume contraction, which leads to uneven cooling of mold and thus forming slab shells with different thicknesses. Then, coupled with the concentration of local stress, surface cracking occurs on slabs. In this paper, the effect of magnesium treatment on the hot ductility of Ti-bearing peritectic steel was studied, and the characteristics of solidification structure and TiN particles were analyzed. Magnesium treatment for Ti-bearing peritectic steel could significantly improve the hot ductility of continuous casting slabs by refining the original austenite structure. After the magnesium treatment, the average grain size of the original austenite of peritectic steel decreased by about 18.7%, and the size of Mg-rich TiN particles decreased by about 41%. In addition, the minimum reduction of area at the third brittle zone after the magnesium treatment was higher than 60%, and the fracture appearance changed from intergranular fracture to ductile fracture after the treatment. The contents of Mg, Ti, O, and N in peritectic steel and the cooling conditions were adjusted reasonably to promote the formation of highly dispersed Mg-rich TiN particles with a sufficient number density and a proper size in the initial solidification stage of peritectic steel, so as to induce the high-temperature δ-ferrite nucleation. Based on the fine δ structure formed by peritectic transformation, through the use of structure heredity and the pinning effect of secondary-precipitated nano TiN particles on the austenite grain boundary, a fine and dense original austenite structure could be obtained to improve the hot ductility of peritectic steel. Industrial tests showed that through the magnesium treatment, the surface cracks of Ti-bearing peritectic steel were effectively restrained, and the corner cracks of slabs were basically eliminated.

show abstract

Effect of Cerium on the Nucleation and Microstructure of High-Strength Low-Alloy Steel During Solidification

Huang,

2024

The Minerals, Metals &Amp; Materials Series

View full text Add to dashboard Cite

Phase Transition of Peritectic Steel Q345 and Its Effect on the Equilibrium Partition Coefficients of Solutes

Cited by 15 publications

References 19 publications

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Effect of Magnesium Treatment on the Hot Ductility of Ti-Bearing Peritectic Steel

Effect of Cerium on the Nucleation and Microstructure of High-Strength Low-Alloy Steel During Solidification

Contact Info

Product

Resources

About