Numerical simulation of HPT processing

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Verleysen, P.^1 ; Van Den Abeele, F.^2 ; Degrieck, J.^1

Department of Materials Science and Engineering, Ghent University, Ghent, Belgium^1

Vikar RandD, Aalter, Belgium^2

关键词: Compression stages;    Elastoplastic behavior;    Finite element simulations;    Hydrostatic stress;    Metal processing industry;    Microstructural changes;    Sample holders;    Severe plastic deformations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012043/pdf
DOI  :  10.1088/1757-899X/63/1/012043

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The principle of achieving high strength and superior properties in metal alloys through the application of severe plastic deformation has been exploited in the metal processing industry for many decades. In this contribution finite element simulations are presented of the HPT process. As opposed to most studies in literature, in which rigid sample holders are considered, the real elasto-plastic behavior of the holders is modeled. The simulations show that during the compression stage, plastic deformation occurs in the holders: initially, at the outside boundary of the sample cavity and, at a later stage, underneath the centre of the sample. The latter region of plastic deformation is rapidly growing and has a non-negligible effect on the response of the sample. Major conclusion is that the sample holders, and more specific, their deformability is key for the conditions in the specimen. Indeed, it severely affects important parameters for both the microstructural changes in the sample material, such as the amplitude and distribution of the hydrostatic stress, and its final shape.