( 1. 南昌大学 材料科学与工程学院， 南昌 330047;
2. 中南大学 材料科学与工程学院， 长沙 410083;
3. 中国船舶总公司725所， 洛阳 315103)
摘 要: 采用DEFORM有限元软件研究了非致密大规格喷射沉积耐热铝合金管材挤压制备的外径为417 mm、 内径为340 mm管材的变形过程， 并模拟了挤压过程中应力场、应变场、 致密度以及挤压力的变化情况。 模拟结果表明： 挤压初期为压实阶段， 挤压力增加缓慢； 随着挤压过程的不断进行， 从挤压尾部到挤压头部， 管坯的致密度呈阶梯式增加，等效应变、 应力和应变速率的变化规律与致密度相类似； 在挤压变形区应变、 应力和应变速率变化剧烈； 挤压后的管材为致密材料， 最大挤压力为6.45×104 kN， 与实际挤压过程中挤压力和致密度相比较，计算机模拟结果与实验结果基本相符。
关键字: 耐热铝合金； 非致密材料； 高温变形； 数值模拟；喷射沉积
heat-resistant aluminium alloy
（ 1. School of Materials Science and Engineering,
Nanchang University, Nanchang 330047, China;
2. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
3. 725 Institute of China Shipping Company, Nuoyang 315103, China）
Abstract: The extrusion process of preparing pipe with external diameter of
417 mm and inner diameter of 340 mm by spray deposition pipe of heat-resistant aluminum alloy through the finite element software DEFORM. The field of stress, strain, density and the extrusion force during extrusion process were analyzed. The results of numerical simulation show that the extrusion force increases laxly at first step of extrusion process. During the extrusion process, the distribution of density increases step by step from the end to the head of ingot, and the distributions rule of strain, stress and strain rate are similarity to that of density. In the field of extrusion distortion, the changes of strain, stress and strain rate are very sharply. The experimental pipe after extrusion is compact material, and the experimental maximum extrusion force is 6.45×104 kN. Compared the maximum of extrusion force with the density of extrusion pipe, the simulation results agree with the experiment results.
Key words: heat-resistant aluminum alloy; porous material; high temperature deformation; numerical simulation; spray deposition
