Strain hardening of heavily cold-worked metals
It is demonstrated that strain hardening in torsion cannot be correlated with axisymmetric deformation by the von Mises effective stress strain criterion. In fcc materials, the flow stress levels and strain hardening rates are typically lower in torsion and saturation, only at lower stress levels. In bcc iron, a low saturtion stress is observed for torsion, whereas linear hardening is observed for axisymmetric extension. Much of the discrepancy in flow curves can be explained by texture. It is demonstrated that a crystallographic effective stress-strain criterion based on evolving average Taylor factors provides the proper magnitude correction for torsional flow curves in fcc materials. The simple crystallographic analysis does not fully explain the hardening response following deformation path changes and multidirectional loading. 96 references, 42 figures.
|Creator/Author:||Hecker, S.S. ; Stout, M.G.|
|Publication Date:||1982 Jan 01|
|OSTI Identifier:||OSTI ID: 6620317; Legacy ID: DE83003544|
|Report Number(s):||LA-UR-82-3446; CONF-821049-7|
|DOE Contract Number:||W-7405-ENG-36|
|Other Number(s):||Other: ON: DE83003544|
|Resource Type:||Technical Report|
|Resource Relation:||Conference: TMS/AIME fall meeting, St. Louis, MO, USA, 24 Oct 1982; Other Information: Portions of document are illegible|
|Research Org:||Los Alamos National Lab., NM (USA)|
|Subject:||36 MATERIALS SCIENCE; ALUMINIUM; STRAIN HARDENING; BRASS; COPPER; IRON BASE ALLOYS; METALS; NICKEL; STEELS; COLD WORKING; EXPERIMENTAL DATA; TITANIUM ADDITIONS; TORSION; TUBES; ALLOYS; COPPER ALLOYS; COPPER BASE ALLOYS; DATA; ELEMENTS; FABRICATION; HARDENING; INFORMATION; IRON ALLOYS; MATERIALS WORKING; NUMERICAL DATA; TITANIUM ALLOYS; TRANSITION ELEMENTS; ZINC ALLOYS|
|Country of Publication:||United States|
|Format:||Size: Pages: 87|
|Availability:||NTIS, PC A05/MF A01.
|Update Date:||2009 Apr 02|