Equal Channel Angular Pressing (ECAP) of hollow profiles made of titanium

7th International Conference on Nanomaterials by Severe Plastic Deformation

Krystian, M.^1 ; Bryla, K.^2 ; Horky, J.^1 ; Mingler, B.^1

Center for Health and Bioresources, Biomedical Systems, AIT, Austrian Institute of Technology GmbH, Wr. Neustadt

2700, Austria^1

Institute of Technology, Faculty of Mathematics Physics and Technical Science, Pedagogical University of Cracow, Krakow

30-084, Poland^2

关键词: Bulk materials;    Commercially Pure titaniums;    Core material;    Cylindrical tubes;    Hollow profiles;    Low temperatures;    Lower temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012010/pdf
DOI  :  10.1088/1757-899X/194/1/012010

来源: IOP

【 摘 要 】

Cylindrical tubes made of commercially-pure titanium (CP-Ti) filled with various mandrels (metallic as well as non-metallic materials) were processed by Equal Channel Angular Pressing (ECAP). Different temperatures (500°C down to room temperature), routes (Bc, B120, C), tools and number of passes (1-6) were applied depending on the mandrel material. For reasons of comparison, solid bolts made of metallic mandrel materials were processed at the same ECAP conditions. The mechanical properties of as-received as well as ECAP tubes and core materials were characterised by hardness mappings (in order to reveal the homogeneity) and tensile tests. The results can be summarised as follows: i) It is feasible to process tubes by ECAP; ii) Using appropriate mandrels, tubes made of CP-Ti can be processed by ECAP at significantly lower temperatures, even at room temperature, as compared to solid bolts; iii) Mechanical properties of tubes and mandrel materials after ECAP are similar to or even better than those of their solid counterparts; iv) Tubes after ECAP at low temperatures show higher strength than what can be achieved in bulk material; v) Excellent homogeneity of microhardness is achieved at least when metallic mandrels and a sufficient number of ECAP passes are used.