A method for flattening the solidification front in directional solidification technology

Lian, Yuanyuan; Li, Dichen; Zhang, Kai

doi:10.1016/j.jcrysgro.2015.06.003

Cited by 11 publications

(23 citation statements)

References 34 publications

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“…The iso-thickness mould, which the wall thicknesses are equal at different positions, cannot reduce the circumferential temperature gradient in traditional manufacturing. Lian et al 20) provided a method by varying the wall thickness of the mould to decrease the circumferential temperature gradient. That is, the wall thickness varies with the positions.…”

Section: Theorymentioning

confidence: 99%

“…The method by Lian et al 20) utilized varying thickness moulds to balance the heat dissipation along the circumferential direction. Thus the heat distribution at the solidi cation front is more uniform than that of the un-optimized one.…”

Section: Control Parameter Of the Wall Thicknessmentioning

confidence: 99%

“…δ(P) is the thickness at P and X(P) is the con guration factor at P. λ is the thermal conductivity of the mould and ε 1 is the emissivity of the mould surface. For more details, see literature 20) . These physical and geometrical parameters are xed during the solidi cation process and need to be set beforehand in simulation except the parameter T 2 which is the temperature of the external surface of the cast and decreases in time.…”

Section: Control Parameter Of the Wall Thicknessmentioning

confidence: 99%

“…Fig. 1 20) provided a method of varying the thickness of the mould for the reduction of the circumferential temperature gradient. The results showed that the solidication front is more planar by reducing the circumferential temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

“…This paper provides an optimization method based on the study of Lian et al 20) for decreasing the circumferential temperature gradient and hence attening the solidi cation front.…”

Section: Introductionmentioning

confidence: 99%

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Flattening the Solidification Front by Varying the Wall Thickness of the Mould in Directional Solidification Technology

Lian

Zhang

2016

Mater. Trans.

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A non-planar solidi cation front can cause many defects in the directional solidi cation process. The irregular shape of the cross section of the cast leads to a non-uniform heat distribution and hence causes a non-planar solidi cation front. This paper provides a method to decrease the circumferential temperature gradient in the directional solidi cation process by varying the wall thickness of the mould. The relationship between the wall thickness and the control parameter has been determined. An optimization algorithm for obtaining the control parameter and the corresponding wall thickness of mould is presented with three simulation examples provided to verify the superiority of this method. According to the results the circumferential temperature gradients can be reduced by 68.7%, 72.0% and 88.2% respectively. Moreover, the transverse temperature gradients are reduced by 57.3%, 60.8% and 89.3% accordingly. The solidi cation front with a varying thickness mould is thus attened compared with the un-optimized one.

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Section: Theorymentioning

confidence: 99%

Section: Control Parameter Of the Wall Thicknessmentioning

confidence: 99%

Section: Control Parameter Of the Wall Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This paper provides an optimization method based on the study of Lian et al 20) for decreasing the circumferential temperature gradient and hence attening the solidi cation front.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations