PSI - Issue 69

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ScienceDirect

Procedia Structural Integrity 69 (2025) 35–40

13th European Symposium on Martensitic Transformation 2024 (ESOMAT 2024) Development of a new technological scheme to produce NiTi seamless tubes Roman Karelin a,b *, Victor Kimarov a,b , Vladimir Cherkasov a,b , Vladimir Andreev a , Vladimir Yusupov a

a IMET RAS, Leninskiy pr. 49, Moscow 119334, Russia b NUST MISIS, Leninskiy pr.4, Moscow 119049, Russia

Abstract In the present study a new technological scheme for the production of seamless tubes from Ti-50.7 at.% Ni shape memory alloy is performed. The initial shell is obtained from the NiTi rod by electrical discharge method allowing to decrease metal consumption. Plugging of the shell is carried out on a screw rolling mill. The deformation-temperature regimes of a shell plugging on a floating mandrel is described in detail. With the application of developed technological scheme NiTi seamless tubes with various outer diameters from 40 to 27.5 mm and a tube schedule from 10 mm to 4.0 mm were produced. The analysis of mechanical and functional properties of obtained tubes reveals that they are quite stable and comparable with properties of initial SMA rods. The suggested technological scheme of NiTi seamless tubes production is promising in terms of simplified processing and potential cost reduction. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Guest Editors

Keywords: shape memory alloy, NiTi, tube, plugging, screw rolling

1. Introduction Titanium nickelide shape memory alloys (SMAs) seamless tubes applies as a semi-finished product for the manufacture of various smart devices in plenty of industries, especially in medicine as a blank for vascular stents [1-

* Corresponding author. E-mail address: rdkarelin@gmail.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Guest Editors 10.1016/j.prostr.2025.07.005