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Modeling of the role of defects in sintered FeCrAlY foams

ISSN号：0567-7718
期刊名称：Acta Mechanica Sinica
时间：0
页码：511-529
语言：英文
分类：TG13[金属学及工艺—合金;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]Cambridge University Engineering Department, Cambridge CB2 1PZ, UK, [2]MOE Key Laboratory of Strength and Vibration School of Aerospace, Xi'an Jiaotong University Xi'an 710049, China
相关基金：The project supported by the National Basic Research Program of China （2006CB601202）, the National Natural Science Foundation of China （10328203, 10572111, 10632060）, the National 111 Project of China （B06024）, and the US 0ffice of Naval Research （N000140210117）. Acknowledgements We would like to acknowledge the support of Porvair Fuel Cell Technology, for supplying the material studied.
相关项目：物理波在超轻多孔材料和结构中的传播和吸收

关键词：金属泡沫材料, 机械性能, 缺陷, 有限元法, 铁铬铝钇合金, Metal foam, Mechanical performance, Defect , Finite element, SEM

中文摘要：

金属 sintering 途径提供费用 -- 为从材料的一个范围的开房间的泡沫的大量生产的有效工具包括高温度的钢合金，它提供新奇机械、声学的性质。在分开的试验性的研究，开房间的钢的机械性质合金(FeCrAlY ) 泡沫在单轴的压缩下面被描绘了并且砍装载。从确定的模型，比作预言一重要在材料性质击倒被观察。这击倒在整个微观结构被归因于缺点的存在从唯一的制造过程的那结果。在现在的纸， sintered FeCrAlY 泡沫的微观结构被使用一个有限元素(FE ) 建模模型。特别地，微结构变化在计算的力量和僵硬上被介绍给一个基础格子，和效果。缺点的一个范围在扫描成像包括破系带，厚度变化，和毛孔阻塞被考虑的电子显微镜(SEM ) 下面识别了，它是在 sintered 泡沫观察的三主要瑕疵。在材料在场的缺点的相应层次是随后输入进 FE 模型，与与试验性的数据相关很好的产生预言。

英文摘要：

The metal sintering approach offers a costeffective means for the mass-production of open-cell foams from a range of materials, including high-temperature steel alloys, which offer novel mechanical and acoustic properties. In a separate experimental study, the mechanical properties of open-celled steel alloy （FeCrA1Y） foams have been characterized under uniaxial compression and shear loading. Compared to predictions from established models, a significant knockdown in material properties was observed. This knockdown was attributed to the presence of defects throughout the microstructure that result from the unique fabrication process. In the present paper, the microstructure of sintered FeCrA1Y foams was modeled by using a finite element （FE） model. In particular, microstructural variations were introduced to a base lattice, and the effects on the strength and stiffness calculated. A range of defects identified under scanning electronic microscope （SEM） imaging were considered including broken ligaments, thickness variations, and pore blockages, which are the three primary imperfections observed in sintered foams. The corresponding levels of defect present in the material were subsequently input into the FE model, with the resulting predictions correlating well with experimental data.

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