Effects of Partition Coefficients, Diffusion Coefficients, and Solidification Paths on Microsegregation in Fe-Based Multinary Alloy

Huang, Yunwei; Long, Mujun; Liu, Peng; Chen, Dengfu; Chen, Huabiao; Gui, Lintao; Liu, Tao; Yu, Sheng

doi:10.1007/s11663-017-1045-2

Cited by 33 publications

(13 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amplitude of the interdendritic microsegregation concentration profiles present after solidification is reduced during cooling of the cast material 27) and subsequent reheating prior to rolling, 28) but, as shown by the results of the EPMA scans of Fig. 2, marked differences remain in the finished plates despite overall rolling reductions of approximately 14 times.…”

Section: Discussionmentioning

confidence: 94%

Influence of Microsegregation on the Onset of the Martensitic Transformation

2019

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 94%

Influence of Microsegregation on the Onset of the Martensitic Transformation

2019

View full text Add to dashboard Cite

“…Table 2 shows the partition coefficients of the most important impurity elements in austenitic stainless steels (Si, P, and S). Solute microsegregation increases significantly with decreasing the partiotion coefficient [46]. Therefore, these impurity elements can be dissolved in δ-ferrite, which can lead to a decrease in interdendritic segregation and a subsequent chance of solidification cracking.…”

Section: Printability Of Austenitic Stainless Steelsmentioning

confidence: 99%

Defect Prevention in Selective Laser Melting Components: Compositional and Process Effects

Sabzi

Rivera-Dı́az-del-Castillo

2019

Materials

View full text Add to dashboard Cite

A model to predict the conditions for printability is presented. The model focuses on crack prevention, as well as on avoiding the formation of defects such as keyholes, balls and lack of fusion. Crack prevention is ensured by controlling the solidification temperature range and path, as well as via quantifying its ability to resist thermal stresses upon solidification. Defect formation prevention is ensured by controlling the melt pool geometry and by taking into consideration the melting properties. The model’s core relies on thermodynamics and physical analysis to ensure optimal printability, and in turn offers key information for alloy design and selective laser melting process control. The model is shown to describe accurately defect formation of 316L austenitic stainless steels reported in the literature.

show abstract

“…Equilibrium partition coefficients for each solidification process of 30Cr15Mo1N ingot are calculated by using the Equation (1). [ 24–27 ]

k_{i, (δ + γ) / L} = w_{δ} k_{i, δ / L} + w_{γ} k_{i, γ / L}

where, k i ,(δ+γ)/L , k i ,δ/L and k i ,γ/L are the partition coefficient in the (δ + γ)/L, δ/L, and γ/L interface, respectively, and

k_{i, δ/L} = \frac{C_{i, δ}}{C_{i, L}}

k_{i, γ/L} = \frac{C_{i, γ}}{C_{i, L}}

. C i ,δ , C i ,γ and C i ,L are the mass fraction of element i in ferrite phase (δ), austenite phase (γ) and liquid phase (L), respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Pressure on Second Dendrite Arm Spacing and Columnar to Equiaxed Transition of 30Cr15Mo1N Ingot

et al. 2021

steel research int.

View full text Add to dashboard Cite

In order to clarify the effects of pressure on the second dendrite arm spacing (SDAS) and columnar to equiaxed transition (CET) of 30Cr15Mo1N ingot, changes in solidification parameters, cooling rate and columnar dendrite tip growth rate with pressure have been investigated. A formula is proposed to obtain the quantitative correlation between pressure (≤ 2 MPa) and interfacial heat transfer coefficient: hi=(28.01P2+299.28P+1129.10)t−0.24. And then, A formula is proposed to calculate SDAS with cooling rate: λ2=21.48×R−0.77, which is applicable for low pressure (≤2 MPa) and low cooling rate (0.4–1.4 K · s−1). There are tiny changes in solidification mode and equilibrium partition coefficient with increasing pressure from 0.5 to 2 MPa. Therefore, increasing pressure refines SDAS mainly by enlarging cooling rate. Pressurization can increase columnar dendrite tip growth rate by enhancing undercooling, and inhibit nucleation and growth of equiaxed dendrite by decreasing constitutional undercooling. It results that the distance between the center of ingot and CET position decreased with increasing pressure from 0.5 to 2 MPa. And a formula is proposed to calculate columnar dendrite tip growth rate with undercooling: V=1.33×10‐5ΔT2+2.71×10‐7ΔT3, which is suitable for low pressure (≤2 MPa).

show abstract

Effects of Partition Coefficients, Diffusion Coefficients, and Solidification Paths on Microsegregation in Fe-Based Multinary Alloy

Cited by 33 publications

References 21 publications

Influence of Microsegregation on the Onset of the Martensitic Transformation

Influence of Microsegregation on the Onset of the Martensitic Transformation

Defect Prevention in Selective Laser Melting Components: Compositional and Process Effects

Effect of Pressure on Second Dendrite Arm Spacing and Columnar to Equiaxed Transition of 30Cr15Mo1N Ingot

Contact Info

Product

Resources

About