FGH96合金挤压过程中Al_2O_3夹杂物的变形特征分析  

Study on Deformation Characteristics of Al_2O_3 Inclusion in FGH96 Extrusion Process

作　　者：张明杰[1] 李付国[1] 陈波[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《锻压装备与制造技术》2010年第3期91-94,共4页China Metalforming Equipment & Manufacturing Technology

摘　　要：通过对FGH96合金中非金属夹杂物Al_2O_3进行微小材料压缩试验,得到其压缩过程中的载荷—位移曲线和平均破碎点载荷。并对FGH96合金在成形温度1000℃,1050℃和1100℃,应变速率1.0s^(-1),0.1s^(-1),0.01s^(-1)和0.001s^(-1)下进行热模拟试验,得到高温下FGH96合金的变形规律。结合以上两组数据,对FGH96合金进行了挤压过程模拟,模拟结果表明挤压筒内部的合金应力值较高且分布均匀,但挤压模坡口处合金的应力值较低且变化较大。针对以上模拟结果,对Al_2O_3夹杂物进行了单向压缩和双向等压两种应力状态下的模拟分析。结果表明,在双向等压条件下,FGH96合金中的Al_2O_3夹杂物只有在其周围基体应力较高时,会在棱角处发生破碎,且碎裂程度较小;而在单向压缩应力状态下,Al_2O_3夹杂物较容易发生破碎,且破碎程度较大。The micro-compression tests of Al2O3 nonmetal inclusions in FGH96 alloy have been conducted in the text, and then the load-displacement curve and average crush load have been obtained. The thermal mechanical test of FGH96 alloy have been carried in deformation temperatures of 1000℃, 1050℃ and 1100℃ and strain rates of 1.0s^ -1,0.1s^-1,0.01s^-1 and 0.001s^-1.The results of two dimensional extrusion numerical simulation show that the stresses of FGH96 alloy in container are higher and uniform.However, the stress becomes lower with greatly change at the neck of container.Then, numerical simulation of Al2O3 inclusion has been developed especially.The results reflect the alloy around Al2O3 inclusion has high stress under biaxial compression, and the crush firstly occurs at the corners.In contrast, nonmetal inclusion is easily crushed under one-way compression because of uneven stress field.

关 键 词：材料实验 缺陷分析 挤压 FGH96合金 数值模拟 

分 类 号：TG376[金属学及工艺—金属压力加工] TG379