TA15钛合金大型复杂构件等温局部加载过渡区宏微观变形研究  

Research on Marco-Microcosmic Deforming in Isothermal Local Loading Transition Region for Large-Scale Complex Integral Components of TA15 Titanium Alloy

作　　者：李志燕[1] 杨合[1] 孙志超[1] 唐泽[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第9期1516-1521,共6页Rare Metal Materials and Engineering

基　　金：国防基础科研"863"计划(2006AA04Z135)

摘　　要：基于DEFORM3D平台,针对大型复杂构件建立了等温局部加载有限元模型,模拟分析了成形参数对过渡区成形和微观组织演化的影响规律。结果表明:随过渡区宽度的增加,过渡区纵向筋和横向筋之间的凹陷增大,平均晶粒尺寸减小;随加载道次的增加,过渡区纵向筋和横向筋之间的凹陷减小,平均晶粒尺寸减小;随锻造温度的升高,加载速度的减小其平均晶粒尺寸增大;只采用局部加载成形方式时,过渡区纵横筋充填不均匀,平均晶粒尺寸较小;采用先局部加载后精整的变形方式时,过渡区纵横筋的充填较好,平均晶粒尺寸较大。A 3D rigid -plastic FEM model for large-scale complex integral components isothermal local loading has been established based on software DEFORM3D, and further the influence law of forming parameters on the plastic deforming and microstructure during isothermal local loading have been simulated and analyzed. The results show that with the increase of the width of transition region, the concave of cross ribs increases and the average grain size decreases. With the increase of the passes, both the concave of cross ribs and average grain size decrease. With increasing the forging temperature and decreasing loading speed, the average grain size increases. Only by local loading forming mode, the cross ribs can not be filled fully but the average grain size is small. When a sizing form is employed after local loading process, the cross ribs can be filled well but the average grain size is large.

关 键 词：局部加载 过渡区 晶粒尺寸 TA15钛合金 大型复杂构件 

分 类 号：TG319[金属学及工艺—金属压力加工]