摘要
钛合金环件径轴向辗轧成形制造全过程通常包含加热环坯转移、辗轧成形及轧制环件冷却3个阶段,而每个阶段都将对最终环件的微观组织产生重要影响。因此,研究阐明钛合金材料在该成形制造全过程的微观组织演变特征与规律,对控制环件最终的组织和性能至关重要。以TA15钛合金环件径轴向辗轧为研究对象,首先阐明了TA15钛合金在上述各阶段的微观组织演变机制与演变模型,进而基于ABAQUS软件平台,建立了TA15钛合金环件径轴向辗轧成形制造全过程的宏微观耦合有限元(FE)模型。通过大量模拟研究表明:加热环坯转移阶段促使初生α相的体积分数增加,晶粒尺寸略微增大;辗轧成形阶段一定程度上细化了初生α相晶粒尺寸,而对初生α相体积分数影响不明显;轧制环件冷却阶段会使初生α相体积分数明显增加,晶粒尺寸增大。
The complete process of the radial-axial rolling of a titanium alloy ring usually includes three operations,namely,the transferring of the heated ring blank from the furnace to the ring rolling mill,the rolling of the heated ring blank,and the cooling of the rolled ring.Each operation can influence strongly the microstructure of the final ring.Therefore,it is important to reveal the characteristics and laws of microstructure evolution of the ring during the whole process of the radial-axial ring rolling for controlling the microstructure and quality of the final ring.Aiming at the whole process of radial-axial rolling of the TA15 titanium alloy ring,the mechanisms and models of microstructure evolution in each operation are clarified first.Then,under ABAQUS environment,a coupled macro-micro and through-process finite element （FE） model of radial-axial ring roll-ing of TA15 titanium alloy is developed.Extensive simulation results show that：the volume fraction of primary alpha shows an obvious increase but the grain size increases slightly in the transferring operation of the heated ring blank; the grain size of primary α is refined but the volume fraction does not exhibit obvious changes during the rolling operation of the heated ring blank; and both the volume fraction and grain size of primary α increase distinctly in the cooling operation of the rolled ring.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2014年第11期3145-3155,共11页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(51175427
51135007)
金属挤压与锻造装备技术国家重点实验室(中国重型机械研究院有限公司)开放基金(2011MEFETKF_03)
重庆理工大学汽车零部件先进制造技术教育部重点实验室2013年度开放基金
国家科技重大专项(2010ZX04004-131-07)
华中科技大学材料成形与模具技术国家重点实验室开放课题研究基金(P2014-05)
高等学校学科创新引智计划(B08040)~~
关键词
环件径轴向辗轧
钛合金
微观组织
全过程
有限元模拟
radial-axial ring rolling
titanium alloys
microstructure
whole process
finite element modeling
