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Mechanical Properties and Constitutive Model of Silica-based Ceramic Core for Directional Solidification of Single Crystal Superalloy
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Key Laboratory for Advanced Materials Processing Technology MOE,School of Materials Science and Engineering,Tsinghua University

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    Abstract:

    The mechanical behaviors of silica-based cores for the directional solidification of single crystal superalloy hollow blades were investigated. The experimental results of strength, elastic modulus and stress-strain relationship of sintered samples S0 and heat treatment samples S1, S2 and S3 were obtained. Based on the Weibull distribution statistics, the continuous damage constitutive model of silica-based cores for the directional solidification of single crystal superalloy hollow blades was established by using M-C (Mohr-Coulomb) criterion. The method of determining the relevant parameters of the continuous damage constitutive model was given. The results show that the mechanical properties and the degrees-of-sinter of silica-based core samples with heat treatment at 1500℃ are improved. The relationship between the crack propagation and the macroscopic fracture of silica-based cores is described by using the damage variable D in the constitutive model and microstructure.

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[Zilin Xu, Jiangwei Zhong, Xianglin Su, Qingyan Xu, Baicheng Liu. Mechanical Properties and Constitutive Model of Silica-based Ceramic Core for Directional Solidification of Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2019,48(3):803~809.]
DOI:10.12442/j. issn.1002-185X.20170731

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History
  • Received:August 16,2017
  • Revised:October 13,2017
  • Adopted:November 09,2017
  • Online: April 10,2019
  • Published: