Transactions of Materials and Heat Treatment

Title：Influence of quasi β forging on microstructure and mechanical properties of TC18 Ti alloy

Authors： Huang Dinghui Zhou Jun Hong Xin Chen Ruigang Zhao Shunfeng

Unit： Wuxi Turbine Blade Co. Ltd.

KeyWords： TC18 Ti alloy cross-region deformation quasi β forging

ClassificationCode：TG113

year,vol(issue):pagenumber：2014,39(8):125-128

Abstract：

The influence of quasi β forging on microstructure and mechanical properties of TC18 Ti alloy was studied. Results show that the microstructure in (α+β) two-phase zone with smaller deformation degree is close to the one in β monophase zone and is of typical basket weave. In (α+β) two-phase zone with larger deformation degree, the crushed degree of grain boundary increases, and the transformation of α phase from lamellar state to isometrical state occurs. When the deformation degree in two-phase zone varies from 0 to 50%, the tensile strength firstly rises and then drops, and it is higher when deformation degree is within 20%-30%, while the plasticity of TC18 Ti alloy goes up slightly. When forging with stepping over phase zone for TC18 Ti alloy, to obtain homogeneous basket weave and ensure the original β-grain boundary to be sufficiently broken, which brings about better strength, plasticity and impact ductility for TC18 Ti alloy, the deformation degree should be more than 35% during hot-forming in β monophase zone with Tβ+20 ℃and within 30% during hot-forming in (α+β) two-phase zone with Tβ-30 ℃.

Funds：

黄定辉（1986-），男，硕士，助理工程师

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