Transactions of Materials and Heat Treatment

Title：Backward extrusion reaming process of Zr-2.5Nb alloy

Authors： Cao Kangqi1 2 Cui Chunjuan1 Li Keyuan2 Li Xinyi2 Zhou Xuan2 Zhang Jianjun2

Unit： 1. College of Metallurgical Engineering Xi′an University of Architecture and Technology 2. Xi′an Western Energy Material Technologies Co. Ltd.

KeyWords： Zr-2.5Nb alloy backward extrusion reaming backward extrusion temperature backward extrusion speed backward extrusion force

ClassificationCode：TG379

year,vol(issue):pagenumber：2024,49(8):73-79

Abstract：

In order to solve the problem of low material utilization rate in the preparation of Zr-2.5Nb alloy extrusion billet, the influences of different backward extrusion temperature and backward extrusion speed on metal flow, temperature field and backward extrusion force in the process of backward extrusion reaming were simulated and analyzed by finite element software Deform-2D, and the simulation results show that when the backward extrusion speed is 15-25 mm·s-1, the temperature field of billet during reaming is relatively uniform. Then, with the increasing of backward extrusion speed, the temperature value corresponding to the temperature field of billet gradually increases, and the metal fluidity become better. Furthermore, when the backward extrusion temperature is 810 ℃ and the backward extrusion speed is 25 mm·s-1, the overall temperature difference of the billet temperature field is the smallest, and with the increasing of backward extrusion speed, the backward extrusion force basically remaines stable. Finally, according to the simulation results, the extrusion test was carried out under the conditions of the backward extrusion temperature of 780-810 ℃ and the backward extrusion speed of 10-80 mm·s-1. The results show that when the backward extrusion temperature is 780 and 810 ℃, respectively, and the backward extrusion speed is 60 mm·s-1, different backward extrusion temperatures have no significant effect on the metal expansion weight. Under the constant backward extrusion temperature, with the increasing of backward extrusion speed, the weight of metal oddments decreases and gradually tends to be stable. When the backward extrusion speed reaches 40-60 mm·s-1, the weight of metal oddments generated during the backward extrusion reaming is lighter, and the material utilization rate is significantly improved. However, when the backward extrusion temperature is 780 ℃ and the backward extrusion speed is 60 mm·s-1, the microstructure uniformity and mechanical properties of the prepared pipe are slightly improved.

Funds：

中核集团“青年英才”计划（CNNC2019QNYC-039）；陕西省秦创原“科学家＋工程师”队伍建设项目（2022-KXJ-145）

作者简介：曹康琪（1989-），男，学士，工程师 E-mail：ckqsnz462@126.com 通信作者：崔春娟（1972-），女，博士，教授 E-mail：cuichunjuan@xauat.edu.cn

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