热处理对激光增材制造Ti-5Al-2Sn-2Zr-4Mo-4Cr钛合金显微组织和力学性能的影响

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 28; no. 1; pp. 36 - 46
Main Author 朱言言;陈博;汤海波;程序;王华明;李佳
Format Journal Article
LanguageEnglish
Published 2018
Subjects
激光增材制造;TC17钛合金;热处理;显微组织;力学性能
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ISSN1003-6326

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Bibliography:laser additive manufacturing; TC17 titanium alloy; heat treatment; microstructure; mechanical properties
43-1239/TG
The effect of heat treatments on laser additive manufacturing(LAM)Ti-5Al-2Sn-2Zr-4Mo-4Cr titanium alloy(TC17)was studied aiming to optimize its microstructure and mechanical properties.The as-deposited sample exhibits features of a mixed priorβgrain structure consisting of equiaxed and columnar grains,intragranular ultra-fineαlaths and numerous continuous grain boundaryα(αGB).After being pre-annealed inα+βregion(840°C)and standard solution and aging treated,the continuousαGB becomes coarser and the precipitate free zone(PFZ)nearby theαGB transforms into a zone filled with ultra-fine secondaryα(αS)but no primaryα(αP).When pre-annealed in singleβregion(910°C),allαphases transform intoβphase and the alloying elements distribute uniformly near the grain boundary.DiscontinuousαGB and uniform mixture ofαP andαS near grain boundary form after subsequent solution and aging treatment.The two heat treatments can improve the tensile mechanical properties of LAM TC17to satisfy the aviation standard for TC17.
ISSN:1003-6326