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许自霖,钟江伟,苏香林,许庆彦,柳百成.单晶高温合金用SiO2基型芯力学性能及本构模型[J].稀有金属材料与工程(英文),2019,47(3):803~809.[Zilin Xu,Jiangwei Zhong,Xianglin Su,Qingyan Xu and 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,2019,47(3):803~809.]
Mechanical Properties and Constitutive Model of Silica-based Ceramic Core for Directional Solidification of Single Crystal Superalloy
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Received:August 16, 2017  Revised:October 13, 2017
DOI:
Key words: single crystal superalloy  silica-based core  mechanical property  constitutive model
Foundation item:国家自然科学基金资助(项目号51374137),国家重点研发计划(2017YFB0701503)
Author NameAffiliation
Zilin Xu,Jiangwei Zhong,Xianglin Su,Qingyan Xu and Baicheng Liu  
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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.