EXTRUSION OF 01417 ALLOY INGOTS OBTAINED IN THE ELECTROMAGNETIC CRYSTALLIZER AT THE CONFORM UNIT

Yu. V. Gorokhov, V. Timofeev, S. V. Belуaev, I. V. Uskov, I. Y. Gubanov, I. S. Gudkov
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引用次数: 1

Abstract

It is known that casting long ingots of small sections (∅8–12 mm) of 01417 alloy into an electromagnetic crystallizer makes it possible to obtain a dispersed structure with insignificant intradendritic segregation. Diffusion annealing of ingots (550 °C, 4–5 h holding time) eliminates intracrystalline segregation and reduces the level of internal stresses in metal thus providing the conditions for subsequent wire drawing. The paper demonstrates that high plastic deformation of ingots without diffusion annealing can be achieved by Conform continuous extrusion, which ensures high quality and geometrical accuracy of products. The analysis of various Conform units revealed an inherent weakness – the absence of connection between the system securing the fixed part of the detachable container (shoe) and the drive wheel shaft, which leads to an increased load in the operating mode. The purpose of the work was to upgrade the Conform unit by creating a connection between the shoe and the impeller shaft to obtain a high-quality billet for subsequent wire drawing of the ∅12 mm ingot cast into the electromagnetic crystallizer. An optimal temperature of ingot extrusion (300 °С) was found to eliminate the intense adhesion of wrought metal on the tool surface. The experimental ∅5 mm rod made of 01417 alloy obtained from the ∅12 mm ingot at the Conform unit features high processing ductility. This is indicated by an increase in its yield point and relative elongation. Metallographic studies demonstrated a fine-grained structure achieved in the extruded rod, which provides the conditions for subsequent wire drawing without annealing. The results of the study provide a basis for refining the process conditions of calibrated billet production on the Conform unit followed by wire drawing with required properties.
在一致性单元的电磁结晶器中挤压得到的01417合金锭
已知将01417合金小截面长锭(∅8-12 mm)置于电磁结晶器中,可以得到分散的组织,晶内偏析不明显。锭的扩散退火(550℃,保温时间4-5小时)消除了晶内偏析,降低了金属的内应力水平,从而为后续的拉丝提供了条件。本文论证了采用conconce连续挤压法,无需扩散退火即可实现锭的高塑性变形,保证了产品的高质量和几何精度。通过对各种设备的分析,我们发现了一个固有的弱点——可拆卸容器(鞋)的固定部分与驱动轮轴之间没有连接,这导致了工作模式下的负载增加。该工作的目的是通过在鞋和叶轮轴之间建立连接来升级符合单元,以获得高质量的坯料,以便后续将∅12 mm铸锭投入电磁结晶器进行拉丝。找到了一个最佳的锭挤压温度(300°С),以消除锻件金属在工具表面的强烈粘附。采用01417合金制作的实验∅5mm棒材,从符合单元的∅12 mm钢锭中获得,具有较高的加工延展性。这表现在其屈服点和相对伸长率的增加上。金相研究表明,在挤压棒中实现了细晶粒结构,这为后续不退火拉丝提供了条件。研究结果为完善在concont装置上生产标定钢坯的工艺条件,然后进行符合要求性能的拉丝提供了依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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