TC4合金叶片终锻过程中微观组织的数值模拟  

Numerical simulation of microstructure in the finish forging process of TC4 alloy blade

作　　者：齐广霞[1] 王晓良 史丽坤 

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]沈阳黎明航空发动机(集团)有限责任公司,辽宁沈阳110043

出　　处：《锻压技术》2014年第12期156-161,共6页Forging & Stamping Technology

摘　　要：根据热模拟压缩和金相实验数据建立TC4钛合金的微观组织模型,并对有限元模拟软件Deform子程序功能进行扩展,使其能够预测微观组织演变。针对叶片的终锻过程进行数值模拟,分析叶片的动态再结晶体积分数和平均晶粒尺寸在不同变形温度、变形速度及摩擦因子下的分布规律。通过模拟结果分析得知,当变形温度逐渐升高时,叶片平均晶粒尺寸先增大后减小;当变形速度增大时,平均晶粒尺寸的分布呈先增大后减小的变化趋势,而动态再结晶体积分数逐渐增大;当摩擦因子逐渐变大时,平均晶粒尺寸的分布呈现先减小后增大的趋势,动态再结晶体积分数变化呈增大趋势,因此为了得到性能较好的锻件,摩擦因子选择较小为好。The recrystallization model of TC4 titanium alloy was established based on the experimental data of the thermal simulation com- press and metallography, and microstructure evolution could be forecasted by developing the function of simulation software Deform subrou- tine. The finish forging process of TC4 titanium alloy blade was simulated, and the distribution laws of volume fraction of dynamic recrystallization and the average grain size for the blade were analyzed under different deformation temperatures, deformation rates and friction coefficients. The simulation results show that the change trend of average grain size for blade decreases after increasing first with the rising deformation temperature. The distribution trend of average grain size for blade decreases after increasing first with the acceleration of the deforma- tion speed, as well as volume fraction of dynamic recrystallization increases gradually. However, the distribution trend of average grain size for blade increases after decreasing first with the increase of friction coefficients gradually, as well as the change of volume fraction of dynamic recrystallization increases gradually. Thus, the friction coefficients should be chosen as small as possible to get a better property of forgings.

关 键 词：TC4钛合金 叶片 终锻 微观组织 数值模拟 

分 类 号：TG319[金属学及工艺—金属压力加工] TG146.23[一般工业技术—材料科学与工程]