Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Constitutive Models for Final Stage Densification of Powder Compacts with Power-Law Creep Deformation

Power-law 크리프 변형을 따르는 분말 성형체의 말기 치밀화 모델

  • 양훈철 (포항공과대학교 대학원 기계공학과) ;
  • 김기태 (포항공과대학교 기계공학과)
  • Published : 2004.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Constitutive models for final stage densification of metal powder compacts with power-law creep deformation were investigated. The constitutive models were implemented into a finite element program (ABAQUS) by using user subroutine CREEP and, from FEM results, useful densification curves were obtained when hydrostatic and uniaxial stress were applied to the powder compacts at various pressures and temperatures. Because the densification behavior varied as the constitutive models, the equivalent stress surface on each constitutive equation was investigated to analyze the difference of densification behavior.

Keywords

References

  1. Helle, A. S., Eastering, K. E. and Ashby, M. F., 1985, 'Hot Isostatic Pressing Diagrams: New Developments,' Acta Metall., Vol. 33, No. 12, pp. 2163-2174 https://doi.org/10.1016/0001-6160(85)90177-4
  2. Yang, H. C. and Kim, K. T., 2000, 'Densification Behavior of Ti-6Al-4V Powder Compacts by Hot Isostatic Pressing,' Transactions of the KSME A, Vol. 24, No.2, pp. 394-402
  3. Kwon, Y. S. and Kim, K. T., 1996, 'Densification Forming of Alumina Powder-Effects of Power Law Creep and Friction,' J. Eng. Mat. Tech., Vol. 118, pp. 471-477 https://doi.org/10.1115/1.2805944
  4. Wilkinson, D. S. and Ashby, M. E, 1975, 'Pressure Sintering by Powder Creep,' Acta Metall., Vol. 23, pp. 1277-1285 https://doi.org/10.1016/0001-6160(75)90136-4
  5. Abouaf, M., 1988, 'Finite Element Simulation of Hot Isostatic Pressing of Metal Powders,' Int. J. Num. Method. Eng., Vol. 25, pp. 191-212 https://doi.org/10.1016/0045-7825(94)90174-0
  6. Duva, J. M. and Crow, P. D., 1992, 'The Densification of Powder by Power-Law Creep During Hot Isostatic Pressing,' Acta Metall. Mater., Vol. 40, No.1, pp. 31-35 https://doi.org/10.1016/0956-7151(92)90196-L
  7. Cocks, A. C. E, 1989, 'Inelastic Deformation of Porous Materials,' J. Mech. Phys. Solids, Vol. 6, pp. 693-715 https://doi.org/10.1016/0022-5096(89)90014-8
  8. Sofronis, P. and McMeeking, R. M., 1992, 'Creep of Power-Law Material Containing Spherical Voids,' J. Applied Mech., Vol. 59, pp. S88-S95 https://doi.org/10.1115/1.2899512
  9. Ponte Castaneda, P., 1991, 'The Effective Mechanical Properties of Nonlinear Isostatic Composites,' J. Mech. Phys. Solids, Vol. 39, No.1, pp. 45-71 https://doi.org/10.1016/0022-5096(91)90030-R
  10. Liu Y. M., Wadley, H. N. G and Duva, J. M., 1994, 'Densification of Porous Materials by Power-Law Creep,' Acta Metall. Mater., Vol. 42, No.7, pp. 2247-2260 https://doi.org/10.1016/0956-7151(94)90303-4
  11. Govindarajan, R. M. and Aravas, N., 1994, 'Deformation Processing of Metal Powders: Part II-Hot Isostatic Pressing,' Int. J. Mech. Sci., Vol. 36, No.4, pp. 359-372 https://doi.org/10.1016/0020-7403(94)90041-8
  12. Sanchez, E., Ouedraogo, E., Stutz, P. and Dellis, C., 1997, 'Numerical Simulation of Metal Powder Forming by Hot Isostatic Pressing,' Int. Workshop on Modelling of Metal Powder Forming Process, Grenoble, France, 21-23 July, pp. 295-304
  13. Bouaziz, O., Dellis, C. and Stutz, P., 1997, 'Creation of a Material Data File for Modelling Hiping of an Austenitic Stsinless Steel,' Int. Workshop on Modelling of Metal Powder Forming Process, Grenoble, France, 21-23 July, pp. 295-304
  14. Kim, K. T. and Jeon, Y. C, 1998, 'Densification Behavior of 316L Stainless Steel Powder Under High Temperature,' Mat. Sci. Eng. A, Vol. A245, pp. 64-71 https://doi.org/10.1016/S0921-5093(97)00696-5
  15. Kim, K. T. and Jeon, Y. C., 1998, 'Densification Behavior and Grain Growth of Tool Steel Powder under High Temperature,' Acta Mater., Vol. 46, No. 16, pp. 5745-5754 https://doi.org/10.1016/S1359-6454(98)00261-4
  16. ABAQUS User's I, II and III Manual, 2001, Ver. 6.2, H.D. Hibbitt, I. Karlsson and E.P. Sorenson, USA
  17. Cocks, A. C. F., 1994, 'The Structure of Constitutive Laws for the Sintering of Fine Grained Materials,' Acta Metall. Mater., Vol. 42, No.7, pp. 2191-2210 https://doi.org/10.1016/0956-7151(94)90299-2