Density-based constitutive modelling of P/M FGH96 for powder forging

被引:14
作者
Chavoshi, Saeed Zare [1 ]
Jiang, Jiaying [1 ]
Wang, Yi [1 ]
Fang, Shuang [2 ]
Wang, Shuyun [2 ]
Shi, Zhusheng [1 ]
Lin, Jianguo [1 ]
机构
[1] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England
[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
关键词
Direct powder forging; FGH96; Densification; Constitutive equations; Finite element modelling; POWER-LAW CREEP; EFFECTIVE ELASTIC-MODULI; MICROSTRUCTURE EVOLUTION; METAL-POWDER; DENSIFICATION BEHAVIOR; PLASTICITY THEORY; NUMERICAL-SIMULATION; ALLOY POWDER; VOID CLOSURE; HOT;
D O I
10.1016/j.ijmecsci.2018.02.003
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A set of viscoplastic constitutive equations is presented in this study to predict hot compressive deformation behaviour and densification levels of powder metallurgy (P/M) FGH96 nickel-base superalloy during direct powder forging (DPF) process. The constitutive equations make use of the elliptic equivalent stress proposed in porous material models, and unify the evolution of relative density, normalised dislocation density, isotropic hardening and flow softening of the powder compact. A gradient-based optimisation technique is adopted to determine the material constants using the experimental data obtained from Gleeble isothermal uniaxial compression tests of HIPed FGH96 at different temperatures and strain rates. The developed constitutive equations are incorporated into finite element code DEFORM via user-defined subroutine for coupled thermo-mechanical DPF process modelling. The constitutive equations benefiting from the viscoplastic densification model of the calibrated Abouaf, among the six studied porous material models, compare favourably with the experimental data, while the equations integrating the porous material model of Shima and Oyane provide excellent agreement with experiments in the low density outer region of the powder compact. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:110 / 121
页数:12
相关论文
共 60 条
  • [1] FINITE-ELEMENT SIMULATION OF HOT ISOSTATIC PRESSING OF METAL POWDERS
    ABOUAF, M
    CHENOT, JL
    RAISSON, G
    BAUDUIN, P
    [J]. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 1988, 25 (01) : 191 - 212
  • [2] ABOUAF M, 1986, J MEC THEOR APPL, V5, P121
  • [3] A study of direct forging process for powder superalloys
    Bai, Q.
    Lin, J.
    Jiang, J.
    Dean, T. A.
    Zou, J.
    Tian, G.
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2015, 621 : 68 - 75
  • [4] THERMOPHYSICAL PROPERTIES OF STAINLESS-STEELS
    BOGAARD, RH
    DESAI, PD
    LI, HH
    HO, CY
    [J]. THERMOCHIMICA ACTA, 1993, 218 : 373 - 393
  • [5] Budiansky B., 1982, Void growth and collapse in viscous solids
  • [6] THE EFFECTIVE MECHANICAL-PROPERTIES OF NONLINEAR ISOTROPIC COMPOSITES
    CASTANEDA, PP
    [J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1991, 39 (01) : 45 - 71
  • [7] A review of some plasticity and viscoplasticity constitutive theories
    Chaboche, J. L.
    [J]. INTERNATIONAL JOURNAL OF PLASTICITY, 2008, 24 (10) : 1642 - 1693
  • [8] An investigation into the effect of variable flash thickness on the strength of an AA7075 part obtained by hot closed-die forging
    Chavoshi, Saeed Zare
    Tajdari, Mehdi
    Luo, Xichun
    [J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE, 2015, 229 (05) : 916 - 925
  • [9] Chavoshi SZ, 2014, INT J INTERACT DES M, P1
  • [10] Densification of mixed metal powder at high temperature
    Cho, JH
    Kim, KT
    [J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2001, 43 (04) : 921 - 933