钢铁钒钛2026，Vol.47Issue(2)：18-28,11.DOI:10.7513/j.issn.1004-7638.2026.02.003
Ti551两相区变形本构模型及热加工图
Constitutive modeling and hot processing map of Ti551 alloy in the α+β two-phase region
摘要
Abstract
As a base material for additive forging processes,a novel titanium alloy Ti551 had been used to conduct hot compression via a Gleeble 3500 thermo-mechanical simulator,and then flow stress curves were obtained over a strain rate range of 0.001～10 s-1 and a temperature range of 700～900℃in this study.The flow stress curves were fitted using a strain-compensated Arrhenius model and an arti-ficial neural network model,respectively.The strain-stress curves indicate that during deformation in the two-phase region,the flow stress of the Ti551 alloy exhibits a typical post-peak softening behavior under medium-to-low temperatures and high strain rates.Compared with predicated results from the strain-compensated model,the artificial neural network model gives higher prediction accuracy and lower average absolute relative error under low-temperature and high strain-rate conditions,with a cor-relation coefficient R of 0.992 2 and a mean average absolute relative error of 6.3%.Based on the con-structed hot processing map of the Ti551 alloy deformed in the two-phase region,the plastic instability domains under different strain conditions were identified.The lower limit of equivalent strain rate dur-ing forging in the α+β two-phase region should be no less than 0.01 s-1,corresponding to an actual for-ging speed of not less than 10 mm/s,and that the final forging temperature should be no lower than 750℃.These finds can help design practical forging parameters and numerical simulation of Ti551 alloy in the α+β two-phase region.关键词
Ti551钛合金/构筑成形/流变应力/本构模型/热加工图Key words
Ti551 alloy/additive forging/flow stress/constitutive model/hot-processing map分类
矿业与冶金引用本文复制引用
程志诚,姜欢,吴佳丽,邓清华,祝学丽,张宏岭,马英杰..Ti551两相区变形本构模型及热加工图[J].钢铁钒钛,2026,47(2):18-28,11.基金项目
国家重点研发计划(2024YFB3714200). （2024YFB3714200）
