基于DEFORM-3D有限元平台建立TA15钛合金复杂构件预锻成形过程的有限元模型,并结合实验分析典型预锻成形过程及缺陷产生原因;在此基础上采用一套系统的优化方法,从预锻成形最后时刻展开逆向修正,经过逐步优化得到了合理的初始毛坯形状,有效的避免了填充不满、折叠等缺陷的发生,获得了填充完好、内部晶粒尺寸均匀细小的预锻件;并基于优化结果开展了成形试验,验证了结果的可靠性.
A finite element (FE) model of preforming process of TA15 Ti-alloy complex components has been established based on DEFORM-3D platform. Combined with the experiments, the preforming process and typical forming defects have been analyzed. An excellent preform with good macroscopical forming quality, uniform and fme microstructure has been fabricated using an optimized billet with the proper initial shape, which is acquired by a systematic stepwise reverse optimization method, effectively avoiding the defects of underfilling and folding in the preforming process. The preforming experiment was carded out based on the optimized initial billet and the result of optimization has been verified which is reasonable and reliable.
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