期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.09.062
关键词
TA15 spun cylindrical parts; Multi-pass flow forming; Microstructural features; Micromechanical properties; Integrated hardness
类别
资金
- National Science Fund for Distinguished Young Scholars of China [51625505]
- Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China [U1537203]
- Research Fund of the State Key Laboratory of Solidification Processing [118-TZ-2015]
- Provincial Natural Science Foundation of Shaanxi [2017JQ5020]
- Fundamental Research Funds for the Central Universities
- Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin -walled Structures
- Excellent Doctorate Cultivating Foundation of Northwestern Polytechnical University
Analysis of the micromechanical behaviour of titanium alloys is of fundamental importance to microstructure control and property tailoring of titanium components. In this study, the dependence of deformation history on the micromechanical properties of TA15 titanium spun cylindrical parts processed by the multi-pass flow forming were analysed together with the microstructural features. The results indicate that the indentation hardness of primary alpha grains (alpha(p)) and the transformed beta matrix (beta(t)) both increase with the increase of the flow forming strain. The indentation hardness of alpha(p) is higher than that of beta(t), which partly results from the obvious indentation size effect (ISE) of alpha(p). With the increase of the flow forming strain, numerous substructures are generated in this process, which increases the proportion of statistically stored dislocations during indentation tests and thus weakens the influence of the ISE on the indentation hardness. The Young's modulus of alpha(p) increases rapidly with deformation, whereas it decreases with the increase of the indenter load. This decrease is attributed to the damage accumulating at higher indentation loads. For beta(t), there is a minor fluctuation of the Young's modulus with strain variation. After the ISE of alpha(p) is eliminated, effect significance of each microstructural feature on the integrated hardness decreases in the order of alpha(p), beta(t), and the grain interfaces of alpha(p)/beta(t). Meanwhile, with the increase of the flow forming strain, the hardness contribution of alpha(p) to the integrated hardness decreases, while those of beta(t) and alpha(p)/beta(t) interfaces increase. These findings provide a basis for tailoring desirable properties of TA15 cylindrical parts in the multi-pass flow forming process.
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