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,2019,47(3):803~809.[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,2019,47(3):803~809.]
单晶高温合金用SiO2基型芯力学性能及本构模型
投稿时间:2017-08-16  修订日期:2017-10-13
中文关键词:  单晶高温合金  SiO2基型芯  力学性能  本构模型
基金项目:国家自然科学基金资助(项目号51374137),国家重点研发计划(2017YFB0701503)
中文摘要:
      本文对定向凝固单晶高温合金空心叶片用SiO2基陶瓷型芯的力学行为进行了研究,得到了烧结样品S0和热处理样品S1、S2和S3的强度、弹性模量、应力-应变关系等实验结果。基于Weibull分布统计使用M-C(Mohr-Coulomb)判据结合实验结果,建立了符合定向凝固高温合金空心单晶叶片用SiO2基陶瓷型芯的连续损伤本构模型,并给出了确定相关参数的方法。结果表明,经过1500℃高温热处理的SiO2基陶瓷型芯样品力学性能、烧结程度均有所提高。使用损伤量D结合连续损伤本构模型公式和微观裂纹形貌,阐述了SiO2基陶瓷型芯裂纹扩展与宏观断裂的演变关系。
Mechanical Properties and Constitutive Model of Silica-based Ceramic Core for Directional Solidification of Single Crystal Superalloy
英文关键词:single crystal superalloy  silica-based core  mechanical property  constitutive model
英文摘要:
      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.
作者单位E-mail
许自霖 清华大学 先进成形制造教育部重点实验室 xuzl09@gmail.com 
钟江伟 清华大学 先进成形制造教育部重点实验室  
苏香林 清华大学 先进成形制造教育部重点实验室  
许庆彦 清华大学 先进成形制造教育部重点实验室  
柳百成 清华大学 先进成形制造教育部重点实验室  
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