( 1. 南昌大學 材料科學與工程學院， 南昌 330047;
2. 中南大學 材料科學與工程學院， 長沙 410083;
3. 中國船舶總公司725所， 洛陽 315103)
摘 要: 采用DEFORM有限元軟件研究了非致密大規(guī)格噴射沉積耐熱鋁合金管材擠壓制備的外徑為417 mm、 內徑為340 mm管材的變形過程， 并模擬了擠壓過程中應力場、應變場、 致密度以及擠壓力的變化情況。 模擬結果表明： 擠壓初期為壓實階段， 擠壓力增加緩慢； 隨著擠壓過程的不斷進行， 從擠壓尾部到擠壓頭部， 管坯的致密度呈階梯式增加，等效應變、 應力和應變速率的變化規(guī)律與致密度相類似； 在擠壓變形區(qū)應變、 應力和應變速率變化劇烈； 擠壓后的管材為致密材料， 最大擠壓力為6.45×104 kN， 與實際擠壓過程中擠壓力和致密度相比較，計算機模擬結果與實驗結果基本相符。
關鍵字: 耐熱鋁合金； 非致密材料； 高溫變形； 數(shù)值模擬；噴射沉積
heat-resistant aluminium alloy
TANG Jian-cheng1, ZHOU Lang2， ZHANG Ying-yuan3
（ 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
