The Results Of Consolidation Of Sinters Being Deformed Under Complex Loading Condition

Archives of Metallurgy and Materials

M. Rosiak¹ 

[1] CHAIR OF MATERIALS SCIENCE AND CHIPLESS TECHNOLOGIES, FACULTY OF MECHANICS, OPOLE UNIVERSITY OF TECHNOLOGY, 76 PRÓSZKOWSKA STR., 45-758 OPOLE, POLAND;

关键词: Keywords: deformation path;    oscillatory torsion;    deformation of the sinters;    density of the sinter;    consolidation of sinters;    porosity distribution;   

DOI  :  10.2478/amm-2013-0151

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The paper deals with the analysis of the possible application of deformation to sinters under uniaxial compression combined with oscillatory torsion. The main problem of the technology relating to the manufacturing of heavy duty machine components using metal powders is associated with the difficulty to obtain sufficiently high, homogeneously distributed densities across the product volume. The tests were carried out using a test stand allowing the deformation under uniaxial compression combined with torsion. The sintered test specimens were made from the NC 100.24 iron powder. The fabricated sintered test specimens were subject to deformation under the uniaxial compression combined with oscillatory torsion, at three different torsion angle values α = ±30; ±50; ±70 respectively. In order to investigate the effect of different torsion frequencies, each test was made at each torsion angle α for at three different frequencies f = 1 Hz; 0.71Hz; 0.32Hz, respectively, and at the same compression velocity. The results obtained allow to conclude that the application of the combined uniaxial compression and oscillatory torsion (for the preset value of draft) during the tests permitted to obtain the average density of the sinters greater than that obtainable in the case of only unconstrained uniaxial compression. The effect of increased density was enhanced by both the additional torsion-induced deformation, and the tangential stress which would promote the closing of pores.

【 授权许可】

Unknown