Abstract
Ni-base superalloys are a class of materials with high temperature excellent tensile, creep, and corrosion properties that have widespread applications in manufacturing hot parts of gas turbines. Application of cross wedge rolling (CWR) process for manufacturing Ni-base superalloys is of least investigated areas. In this article, the effects of CWR tool parameters on formability of Nimonic® 80A and Nimonic® 115 wrought superalloys are presented. The normalized Cockcroft-Latham model is adopted through finite element analysis to predict the occurrence of internal burst. The analytical results are validated through comparing them with experimental data. Comprehensive results of the effects of various CWR tool parameters on formability of Nimonic® 80A and Nimonic® 115 are presented. The results show that in some cases for Nimonic® 115, regardless of the stretching angle value (β), the internal burst fails the process. The results also indicate that Nimonic® 80A displays a relatively good ductility in low wedge angles and low stretching angles without suffering internal bursts, leading to sound part.
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Mirahmadi, S.J., Hamedi, M. & Ajami, S. Investigating the effects of cross wedge rolling tool parameters on formability of Nimonic® 80A and Nimonic® 115 superalloys. Int J Adv Manuf Technol 74, 995–1004 (2014). https://doi.org/10.1007/s00170-014-6047-5
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DOI: https://doi.org/10.1007/s00170-014-6047-5