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中文摘要: 制定了3种Ti-6Al-4V合金大规格方坯锻造工艺，通过Simufact仿真软件对工艺参数进行优化，在万吨液压机上进行全流程控制锻造，制备出规格为245 mm×480 mm×3 700 mm的大规格方坯。对方坯的力学性能和显微组织进行表征，分析锻造工艺对大规格方坯组织与性能的影响。结果表明，3种工艺锻制的Ti-6Al-4V合金大规格方坯显微组织均为等轴组织，初生α相含量约占80%。工艺A和工艺B制得的方坯组织细小，均匀性好，超声波杂波水平低。工艺C锻制的方坯晶粒粗大，组织不均匀，心部存在长条及大块状α相。工艺A、B锻制的方坯有较好的强度和塑性匹配，工艺C锻制的方坯强度虽较高，但塑性相对较低。从组织均匀性、力学性能及杂波水平综合考虑，工艺A为最优锻造方案。
Abstract:Three kinds of Ti-6Al-4V alloy large billet forging processes were developed. Optimization of process parameters by Simufact simulation software. The full process forging was carried out on 10 000 ton hydraulic machine to prepare a large specification forging billet of 245 mm×480 mm×3 700 mm. The mechanical properties and microstructure of the large forging billet were characterized, and the effect of forging technology on the microstructure and mechanical properties of large forging billet was analyzed. The results show that the microstructures of large forging billet Ti-6Al-4V alloy are isoaxial, and the initial alpha phase content account for about 80%. The microstructures of forging billets forged by process A and process B are small and the uniformity is good, and the level of ultrasonic clutter is lower. The forging billet grain size of process C forging is large and uneven tissue, and there are long strips and large block alpha phases in the heart. The forging billets produced by process A and B have a good strength and plastic match. Although the strength of process C is high, but the plasticity is relatively low. Process A is the optimal scheme considering the tissue uniformity, mechanical properties and clutter level.
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