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Hot Torsion Testing: Part One :: Total Materia Article
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Overview of Total Materia database 12th January 2022
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Hot Torsion Testing: Part One
Hot torsion testing is key in find te interdependence between hot plastic deformation process parameters, and te material structure and properties.
This method has been useful to provide te existence of hot ductility as being dependent on both temperatures and strain rates.
Over 500 million tons of steel production in te world is formed into rolled, forged and other products by means of various technological processes of metal forming where huge amounts of energy need to be employed to master te resistant forces and material stress. Te behavior of metals and alloys during hot deformation is a complex issue and alters with te change of process parameters such as: deformation size, deformation rate and temperature. Te analysis of hot working conducted with te application of a torsion test using a torsion plastometer allowed te determination of te influence of deformation conditions on plasticity of te steel. Te high-temperature plastic working is coupled with dynamic processes of recovery influencing te structure and properties of alloys. One of te crucial issues is finding te interdependence between te hot plastic deformation process parameters, te structure and properties.
Te torsion test is one of te most widely used methods for te evaluation of te deformation behavior of metals. Traditionally it is used to provide basic data for te characterization of te mechanical properties of metallic materials under shear. Te torsion test provides hot ductility as dependent on temperatures and strain rates.
Te hot torsion test is widely used for assessing hotworkability and constitutive behavior of new materials and alloys. One of te disadvantages of te hot torsion test is its non-homogeneity of deformation. It mostly occurs outside te gauge section of te specimen due to a longitudinal gradient in torsional stiffness along te specimen. Therefore, further improvements in te classical solutions and analysis of te test such as method of Fields and Backofen are demanded.
Methods have been proposed to use an effective length of te hot torsion test specimen. Existing methods, however, are only applicable to te materials with monotonic flow curve and therefore are not considered as general tools. Grabianowski and Kurowski presented an experimental method for estimating deformation outside te gauge section. Te method is based on te results of a certain stage of deformation and therefore cannot be used to estimate development of te deforming region with deformation.
In an attempt to estimate te degree of longitudinal nonhomogeneous deformation within te hot torsion test specimen and its variations with deformation, a general iterative technique for estimating te effective length of te specimen is presented.
In figures 1, 2 and 3 are represented te drawing of te sample for hot torsion test, te sample during te trial and te hot torsion testing machine, respectively.
Figure 1: Drawing of te sample for hot torsion test
Figure 2: Hot torsion testing machine
Figure 3: Sample during te trial
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