| Реферат |
This paper describes the results of a study that looked at the microstructure, phase composition and mechanical properties of a binary powder alloy of TiNi (55.5 % (wt) Ni) at different stages of deformation induced by helical rolling at 1,000 oC . Inconsistent sectional grain structures were found in the specimens with the following degrees of deformation — ε = 0.09, 0.3 and 0.6: The surface layers would form finer grains while the core would have a coarser grain structure. In the specimens that were subjected to sintering and slight deformation (ε = 0.09; 0.3; 0.6), pores were found of a close-to-spherical shape. Deformation (ε = 0.8) helps cure bigger pores. At the same time, it leads to smaller ellipsoidal pores occurring in the core layers. Durometric and metallographic studies showed that, before ε = 0.3, the relative density of the alloy rose while its porosity decreased. However, as the reduction degree grew to ε = 0.8, the core of the specimens would form a porous structure. Deformation to ε = 0.3 does not lead to any significant change in the average grain size compared with the as-sintered state. Finer grains were not observed until the deformation reached ε = 0.6, and when the deformation is further increased to ε = 0.8, a consistent grain structure is formed with the average grain size of 64 μm. It is shown that the structure of the powder alloy of NiTi after deformation includes a B2 austenitic phase, and the deformation of ε = 0.8 can result in up to 10 % of R-martensite formed, which is probably caused by a shift of the martensitic transformation points towards the high temperature region. The deformation of ε = 0.8 leads to increased strength and ductility of the alloy compared with the as-sintered state. However, the resultant ductility does not meet the TU 1-809-394–84 specification applicable to the ТН1 alloy grade. So, the deformation of ε = 0.8 by helical rolling produces a consistent sectional grain structure but creates localized porosity in the core, which is one of the causes of low ductility. In order to improve ductility, it is recommended to apply higher degrees of deformation and optimised regimes of helical rolling. This could help form finer grains and eliminate porosity in the core thus improving ductility. The results of implementing the above recommentations are described in the second part of the research paper.
This research was funded by the Russian Foundation for Basic Research (Project No. 17-03-00360 А). |
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