钛合金复杂构件等温锻造工艺研究

针对钛合金复杂构件采用机加工成形成本高,材料利用率低的现状,提出钛合金复杂构件的新工艺,即先等温锻造成复杂构件形状,然后辅以机械加工的方法成形。通过有限元模拟分析和实验研究,提出非对称变截面钛合金复杂构件等温锻造成形工艺为:锻造温度900～950℃,应变速率0.03 mm·s-1,采用玻璃润滑剂,模具材料选用K3合金和空冷的锻后处理。实验结果表明:采用该等温锻造成形工艺获得的钛合金复杂构件完全满足系统的性能要求,并可替代机械加工产品;按新工艺加工成形的钛合金复杂构件,不但降低成本,缩短机加工时间,而且材料利用率也提高到60%以上。

Isothermal Forging Process of Titanium Alloy Complex Components

Because titanium alloy complex components were usually formed by machining,leading to higher cost and lower utilization of materials,a new technique for forming process of titanium complex components was put forward.Firstly,the components were forged into complex shape by using isothermal forging,and then supplemented by mechanical processing methods.Through finite element analysis and experiment,the isothermal forging process for complex components which was non-symmetrical and had various cross-sections was set a technique at forging temperature of 900~950 ℃,strain ratio of 0.03 mm · s-1,with glass lubricant,K3 alloy was used for material of mould,and method of cooling through air was used for heat treatment after forging.The results showed that the titanium complex component which was made by the isothermal forging process fully met the requirements,and it could replace machining products.Titanium alloy complex components for aerospace processed by the new technology not only reduced the costs,but also shortened machine processing time,and material utilization also increased to 60%.