DESIGN,PROCESSING AND EVALUATION OF FUNCTIONALLY GRADIENT MATERIALS BY MEANS OF CENTRIFUGAL CASTING METHOD

离心铸造法功能梯度材料的设计、加工与评价

基本信息

批准号：
07555348
负责人：
INOUE Tatsuo
金额：
$ 1.34万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

When the centrifugal casting method is employed in the production process of metal matrix composite, it is possible to control the distribution of reinforcement in radial direction. The present research project is intended to clarify the effect of casting conditions on the mechanical properties of the metal matrix composite from both experimental and theoretical points of view. The following results are obtained through the project.1.Experimental results : A metal matrix composite, which is composed of Al-alloy as the matrix and SiC-particles as the reinforcement, is produced by means of a centrifugal casting apparatus. The matrix is too rapidly solidified around the casting mold and so the reinforcement is not sufficiently distributed over the thickness, although the volume fraction of the reinforcement in general increases with radius. This can be improved by heating the surrounding mold. The casting pressure due to centrifugal force strengthens the bonding resistance between the matrix and reinforcement. Therefore the casting conditions, such as the casting speed as well as the mold temperature, have a predominant influence on the mechanical property of the products.2.Numerical results : A numerical simulation is carried out in order to evaluate both the distribution of reinforcement and the residual stresses, based on the finite element method. The simulated results of the SiC-particle distribution show good agreement with the experimental data. And higher casting speed is needed in order to obtain a final product with highly gradient content of the reinforcement. It is shown that larger residual stress is induced through the processing when including higher volume fraction of the reinforcement in the metal matrix composite.

当在金属基质复合材料的生产过程中采用离心铸造方法时，可以控制径向方向上加固的分布。本研究项目旨在阐明铸造条件对从实验和理论观点的金属基质复合材料的机械性能的影响。 1.经验结果：一种金属基质复合材料，由Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-Al-As sic Presticles组成，作为加固，是通过离心式铸造设备产生的。基质在铸造模具周围过快地固化，因此钢筋在厚度上没有足够的分布，尽管加固的体积分数通常随半径增加而增加。通过加热周围模具可以改善这一点。由于离心力引起的铸造压力增强了矩阵和增强型之间的粘结性。因此，铸造条件（例如铸造速度和模具温度）对产品的机械性能产生了主要影响。2。进行数值模拟，以评估基于有限元方法的加固和残留应力的分布。 SIC粒子分布的模拟结果与实验数据表现出良好的一致性。为了获得具有高度梯度含量的最终产品，需要更高的铸造速度。结果表明，在包含金属基质复合材料中加固的较高体积分数时，通过处理引起较大的残留应力。