Evaluation of the Stress-Strain and Thermal States of Ni–Ti-alloy Billets Subjected to Screw Piercing

M. M. Skripalenko,V. A. Andreev,B. A. Romantsev,V. S. Yusupov,S. O. Rogachev, M. P. Kuprikov, V. P. Kuznetsov,M. N. Skripalenko, E. V. Shuster

Metallurgist（2025）

Russian Academy of Science | B. Yeltsin Ural Federal University | NUST “MISIS”

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Abstract

We performed computer simulations of the screw piercing of titanium-nickelide shells in two- and four-high mills. On the basis of the accumulated numerical results, we compute the parameters of the stress-strain and thermal states of the shells. The distributions of levels of the accumulated strain and the normalized mean stress show that a more homogeneous stress-strain state and a lower hazard of fracture of the shells are detected in the case of four-high piercing. The analysis of the temperature distribution shows that, in the case of four-high piercing, the obtained temperature state is more favorable for guaranteeing higher levels of plasticity of the materials of pierced shells.

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Key words

Screw piercing,Two-high mill,Four-high mill,Titanium nickelide,Stress-strain state,Thermal state,Plasticity

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【要点】：本研究通过计算机模拟分析了两高和四高轧机上钛镍合金壳体螺丝穿孑过程中的应力-应变和热状态，发现四高穿孑工艺能够得到更均匀的应力-应变状态并降低壳体断裂的风险，同时更有利于保持材料的高可塑性。

【方法】：采用计算机模拟方法对钛镍合金壳体在螺丝穿孑过程中的力学和热行为进行研究。

【实验】：通过数值模拟实验，使用的数据集为钛镍合金壳体螺丝穿孑的模拟结果，得到了四高轧机条件下更有利于材料可塑性的温度分布。