Enhancing work hardening and ductility in additively manufacturedβTi:roles played by grain orientation,morphology and substructure

作     者：Ahmad Zafari Edward Wen Chiek Lui Mogeng Li Kenong Xia Ahmad Zafari;Edward Wen Chiek Lui;Mogeng Li;Kenong Xia

作者机构：Department of Mechanical EngineeringThe University of MelbourneVictoria 3010Australia Centre for Additive ManufacturingSchool of EngineeringRMIT UniversityMelbourneVIC 3000Australia Physics of Fluids GroupMax Planck Center for Complex Fluid DynamicsJ.M.Burgers Center for Fluid Dynamics and MESA+Research InstituteDepartment of Science and TechnologyUniversity of Twente7500AE Enschedethe Netherlands 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第105卷第10期

页      面：131-141页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the Australian Research Council(No.DP190103557) the University of Melbourne(No.ECRG20) 

主　　题：βtitanium Work hardening Anisotropy Equiaxed microstructure Slip band Laser powder bed fusion 

摘      要：A metastableβTi alloy was additively manufactured by laser powder bed fusion(LPBF).Tensile testing along the build direction of the as-LPBF material(LPBF-0°)revealed signifcant work softening immediately following yielding with no uniform *** contrast,substantial work hardening and uniform elongation well over 10%were achieved perpendicular to the build direction(LPBF-90°).Similar effects were obtained in the build direction after super transus heat treatment(LPBF-0°+HT)although the strength was slightly *** addition,the yield drop phenomenon observed in both orientations of the as-LPBF materials disappeared after *** enhanced work hardening ability,and thus ductility,can be attributed to increased interactions of slip bands/slip bands owing to additional{112}slip systems becoming operative in LPBF-0°+HT and LPBF-90°while LPBF-0°was dominated by{110}*** other variations after HT may be related to the coarsening of grain structure and removal of specifc substructures in the as-LPBF microstructure.