2基型芯;力學(xué)性能;本構(gòu)模型"/> 2基陶瓷型芯的力學(xué)行為進(jìn)行了研究,得到了燒結(jié)樣品S0和熱處理樣品S1、S2和S3的強(qiáng)度、彈性模量、應(yīng)力-應(yīng)變關(guān)系等實(shí)驗(yàn)結(jié)果。基于Weibull分布統(tǒng)計(jì)使用M-C(Mohr-Coulomb)判據(jù)結(jié)合實(shí)驗(yàn)結(jié)果,建立了符合定向凝固高溫合金空心單晶葉片用SiO2基陶瓷型芯的連續(xù)損傷本構(gòu)模型,并給出了確定相關(guān)參數(shù)的方法。結(jié)果表明,經(jīng)過1500℃高溫?zé)崽幚淼腟iO2基陶瓷型芯樣品力學(xué)性能、燒結(jié)程度均有所提高。使用損傷量D結(jié)合連續(xù)損傷本構(gòu)模型公式和微觀裂紋形貌,闡述了SiO2基陶瓷型芯裂紋擴(kuò)展與宏觀斷裂的演變關(guān)系。"/>

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單晶高溫合金用SiO2基型芯力學(xué)性能及本構(gòu)模型
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清華大學(xué) 先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室

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國家自然科學(xué)基金資助(項(xiàng)目號51374137),國家重點(diǎn)研發(fā)計(jì)劃(2017YFB0701503)


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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    本文對定向凝固單晶高溫合金空心葉片用SiO2基陶瓷型芯的力學(xué)行為進(jìn)行了研究,得到了燒結(jié)樣品S0和熱處理樣品S1、S2和S3的強(qiáng)度、彈性模量、應(yīng)力-應(yīng)變關(guān)系等實(shí)驗(yàn)結(jié)果?；赪eibull分布統(tǒng)計(jì)使用M-C(Mohr-Coulomb)判據(jù)結(jié)合實(shí)驗(yàn)結(jié)果,建立了符合定向凝固高溫合金空心單晶葉片用SiO2基陶瓷型芯的連續(xù)損傷本構(gòu)模型,并給出了確定相關(guān)參數(shù)的方法。結(jié)果表明,經(jīng)過1500℃高溫?zé)崽幚淼腟iO2基陶瓷型芯樣品力學(xué)性能、燒結(jié)程度均有所提高。使用損傷量D結(jié)合連續(xù)損傷本構(gòu)模型公式和微觀裂紋形貌,闡述了SiO2基陶瓷型芯裂紋擴(kuò)展與宏觀斷裂的演變關(guān)系。

    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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許自霖,鐘江偉,蘇香林,許慶彥,柳百成.單晶高溫合金用SiO2基型芯力學(xué)性能及本構(gòu)模型[J].稀有金屬材料與工程,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.]
DOI：10.12442/j. issn.1002-185X.20170731

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  • 收稿日期:2017-08-16
  • 最后修改日期:2017-10-13
  • 錄用日期:2017-11-09
  • 在線發(fā)布日期: 2019-04-10
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