中南大学学报（自然科学版）2016，Vol.47Issue(6)：1872-1877,6.DOI:10.11817/j.issn.1672-7207.2016.06.008
触变模锻Al-7%Si/Al-30%Si合金双金属的数值模拟
Numerical simulation of thixo-forging Al-7%Si/Al-30%Si alloys bimetal
摘要
Abstract
The forming process of thixo-forging Al-7%Si/Al-30%Si alloy composite in the semi-solid state was simulated by finite element software DEFORM-3D.The filling characteristics of bimetal billets in the composite forming process and the effects of process parameters on composite forming were investigated. The results show that single metal thixo-forging has integrity forming feature. And the filling capacity of bimetal thixo-forging is greatly affected by the efficiency of the stress transfer through interface, which results in the fact that the filling capacity of the bottom billet on the opposite side of moving die is worse than that of the single metal. The filling capacity of bottom billet would improve with the increase of the initial temperature of bottom billet or the efficiency of the stress transfer. However, when the initial temperature of the bottom billet is too high, the interface will deviate to bottom die and bend badly, and flash will appear on the bottom. The greater the friction coefficient between billets and molds, the more serious the composite interface bends and edge tilts upward. When the initial temperatures of Al-7%Si alloy and Al-30%Si alloy are 585℃and 575℃, respectively, and the friction coefficients between billets and dies are small, top and bottom billets are deformed harmonically, forged pieces fill fully, interface of composite is well located in the center of the work pieces. The filling character is good.关键词
半固态成形/双金属复合/触变模锻/数值模拟/DEFORM-3D软件Key words
semi-solid forming/bimetal composite/thixo-forging/numerical simulation/DEFORM-3D software分类
矿业与冶金引用本文复制引用
黄宏华,杨昭,王光旭,史晓成,贺小龙..触变模锻Al-7%Si/Al-30%Si合金双金属的数值模拟[J].中南大学学报（自然科学版）,2016,47(6):1872-1877,6.基金项目
国家自然科学基金面上项目(51474241)；中南大学中央高校基本科研业务费专项资金资助项目(2014zzts173)(Project (51474241) supported by the National Natural Science Funds （51474241）
Project(2014zzts173) supported by the Fundamental Research Funds for the Central Universities in Central South University) （2014zzts173）
