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The samples of TAI 5 titanium alloy were hot compressed in the temperature range of 550-1 000 β at constant strain rate from 0.01 s^-1 to 1.0 s^-1. The flow behavior and microstructural evolution during hot deformation of TA 15 alloy were investigated, based on which the hot working parameters of TA15 alloy were selected. The results show that with the increase of deformation temperature and decrease of stain rate, the flow stress decreases gradually, but the magnitude of stress drop varies with the increase of temperature in different temperature intervals. According to the flow stress and deformation microstructure, the deformation behavior can be classified into three types as working hardening(550-600 β, α+β phase), dynamic recrystallization (650-900 ℃, α+β phase) and dynamic recovery(950-1 000 ℃, β phase). The main softening mechanism is dynamic recrystallization(DRX) of a phase in α+β phase zone and dynamic recovery(DRV) of β phase in β phase zone. As the stain rate decreases dynamic recrystallization of a phase proceeds more adequately in α+β zone and the β subgrains of dynamic recovery have the tendency to grow infl zone. The reasonable temperature for warm forming of TA15 alloy is in the range of 600-700 , which has been verified by warm spinning experiment of tube workpieces.: 相似文献
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锻件在装备制造行业领域属于重要的承力基础零部件。随着我国由制造大国向制造强国转变,锻造行业迫切需要向智能制造方向发展。从智能锻造系统的4个模块阐述了智能锻造技术的发展:第一个模块为机器人自动化生产线及集成控制系统,是自动化产线的核心,用于执行端命令的下达;第二个模块是多机器人协作优化系统,用于调节机器人及设备运动以保证产线高效运作;第三个模块是锻造产线实时数据存储及分析系统,用于判断实时产线运行状况以触发新事件;第四个模块为新锻件工艺快速开发系统,用于新锻件工艺的设计与开发。还分析了目前智能锻造领域存在的问题,认为只有建立企业、高校和研究所等的紧密联系,以问题为导向进行攻关,在此基础上培养交叉复合型人才,才能促进智能锻造的进一步发展。 相似文献
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为了研究强旋工艺中钛合金材料变形组织和织构演化规律,进行了BT20钛合金筒形件反旋工艺实验,采用光学和X射线衍射方法分别对表面微观组织和晶体取向演化过程进行了分析.研究表明:旋压件外表面组织因反复拉压和剪切作用变得复杂和不均匀;多道次大变形旋压变形可以改善组织不均匀性,在轴截面上形成较均匀的轴向纤维组织;旋压过程中因径向压缩变形导致基面{0002}趋于与筒表面相切排列.在内表面,基面择优程度随内层实际变形量增大而稳定增强.在外表面,基面择优程度在一定变形量内迅速增强,随后有所减弱. 相似文献
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Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) alloy impeller is an important part in the airspace engine that serves under severe working conditions, and it requires excellent mechanical properties and high dimensional precision. However, the integral titanium alloy impeller is difficult to precisely forge because of its complex shape and poor formability. In order to develop optimum forging process of this kind of complex parts, the deformation characteristics of TC 11 alloy under isothermal compressing conditions were studied. Furthermore, an alternative material, namely pure lead, was selected to model the forming process of the impeller and investigate metal flow during forging. Based on the research, local loading method was determined to forge the TC 11 alloy impeller precisely under isothermal condition. The dimensional accuracy, mechanical properties and microscopic structure of the forged product satisfy operating requirements. 相似文献
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TA15钛合金强热旋微观组织演变(英文) 总被引:1,自引:0,他引:1
研究TA15钛合金热强旋过程中的微观组织演变,探讨壁厚减薄率对TA15钛合金微观组织演变的影响。变形过程中,滑移变形是主要的变形机制,孪晶起到协调变形的作用。微观结构逐渐转变为细小的纤维组织,并且初生α晶粒的长径比随着壁厚的减薄而增加,再结晶分数和显微硬度也随着减薄率的增加而增加。 相似文献