Measurement and Interpretation of Flow Stress Data for the Simulation of Metal-Forming Processes

Abstract : Slip activity, Burgers vector populations, and dislocation densities were determined by X-ray line-profile analysis of peaks from individual grains in a bulk polycrystalline sample. The method was tested at the focused X-ray beamline ID11 at the European Synchrotron Research Facility (ESRF) in Grenoble, France and was applied to a bulk commercial purity titanium specimen for which slip activity was determined for 49 single grains. The most-active slip systems were of and type, and the orientation of the stresses acting on these slip systems revealed a spread due to the effect of neighborhood grains on plastic response. The new x-ray method can provide input for crystal-plasticity analyses and permits experimental verification of the results of numerical calculations which was not possible before.

[1]  Chun‐Sing Lee,et al.  Dynamic-coarsening behavior of an α/β titanium alloy , 2006 .

[2]  T. Langdon.  Grain boundary sliding revisited: Developments in sliding over four decades , 2006 .

[3]  S. Semiatin,et al.  Deformation and recrystallization behavior during hot working of a coarse-grain, nickel-base superalloy ingot material , 2004 .

[4]  O. Lee,et al.  Dynamic material property characterization by using split Hopkinson pressure bar (SHPB) technique , 2003 .

[5]  J. Jonas,et al.  Self-consistent modeling of the flow behavior of wrought alpha/beta titanium alloys under isothermal and nonisothermal hot-working conditions , 2002 .

[6]  S. Semiatin,et al.  The adiabatic correction factor for deformation heating during the uniaxial compression test , 2001 .

[7]  Thomas R. Bieler,et al.  The effect of alpha platelet thickness on plastic flow during hot working of TI–6Al–4V with a transformed microstructure , 2001 .

[8]  T. Bieler,et al.  Effect of texture and slip mode on the anisotropy of plastic flow and flow softening during hot working of Ti-6Al-4V , 2001 .

[9]  M. E. Kassner,et al.  Current issues in recrystallization: a review , 1997 .

[10]  J. Jonas,et al.  Temperature dependence of the rate sensitivity and its effect on the activation energy for high-temperature flow , 1996 .

[11]  J. Jonas,et al.  A mechanical interpretation of the activation energy of high temperature deformation in two phase materials , 1996 .

[12]  Rajiv Shivpuri,et al.  Modeling microstructural development during the forging of Waspaloy , 1995 .

[13]  G. Sundararajan,et al.  The hardness-flow stress correlation in metallic materials , 1994 .

[14]  Taylan Altan,et al.  A technique to compensate for temperature history effects in the simulation of non-isothermal forging processes , 1992 .

[15]  J. Jonas,et al.  An analysis of the isothermal hot compression test , 1992 .

[16]  John J. Jonas,et al.  Prediction of steel flow stresses at high temperatures and strain rates , 1991 .

[17]  I. V. Samarasekera,et al.  The thermal and metallurgical state of steel strip during hot rolling: Part III. Microstructural evolution , 1991 .

[18]  C. M. Sellars,et al.  Modelling microstructural development during hot rolling , 1990 .

[19]  John J. Jonas,et al.  Overview no. 35 Dynamic recrystallization: Mechanical and microstructural considerations , 1984 .

[20]  R. C. Gifkins.  Grain-boundary sliding and its accommodation during creep and superplasticity , 1976 .

[21]  Taylan Altan,et al.  Prediction of Temperature Distributions in Axisymmetric Compression and Torsion , 1975 .

[22]  J. R. Douglas,et al.  Flow Stress Determination for Metals at Forging Rates and Temperatures , 1975 .

[23]  J. Jonas,et al.  The deformation of armco iron and silicon steel in the vicinitl of the curie temperature , 1974 .

[24]  Taylan Altan,et al.  Flow Stress of Metals and Its Application in Metal Forming Analyses , 1973 .

[25]  C. H. Lee,et al.  Influence of Flow Stress and Friction Upon Metal Flow in Upset Forging of Rings and Cylinders , 1972 .

[26]  Hugh Ford,et al.  On the Basic Yield Stress Curve for a Metal , 1955 .

[27]  A. Ghosh,et al.  Low-Temperature Coarsening and Plastic Flow Behavior of an Alpha/Beta Titanium Billet Material with an Ultrafine Microstructure , 2008 .

[28]  Klaus Pöhlandt,et al.  Materials testing for the metal forming industry , 1989 .

[29]  Yoshie Atsuhiko,et al.  Formulation of Static Recrystallization of Austenite in Hot Rolling Process of Steel Plate , 1987 .

[30]  Taylan Altan,et al.  Determination of Flow Stress Data for Practical Metal Forming Analysis , 1981 .

[31]  J. Jonas,et al.  Hot compression behaviour of thermo-mechanically processed alpha zirconium , 1977 .

[32]  U. F. Kocks.  Laws for Work-Hardening and Low-Temperature Creep , 1976 .

[33]  J. D. Eshelby.  The Distribution of Dislocations in an Elliptical Glide Zone , 1963 .

[34]  R. Armstrong,et al.  The plastic deformation of polycrystalline aggregates , 1962 .