铸造技术2025，Vol.46Issue(9)：882-887,6.DOI:10.16410/j.issn1000-8365.2025.5129
高强钛合金大尺寸棒材芯表横纵组织与性能研究
Study of the Microstructure and Mechanical Properties of Large-sized High-strength Titanium Alloy Bars:Core and Surface in the Longitudinal and Transverse Directions
摘要
Abstract
Focusing on large TC18 titanium alloy bars with a diameter of 400 mm,the tensile properties,microstructural characteristics,fracture morphology,and characteristics of voids in the fracture surface profile were systematically investigated at four locations:the center transverse(CT),center longitudinal(CL),edge transverse(ET),and edge longitudinal(EL)locations.The tensile results demonstrate that edge samples exhibit a significant strength advantage,with the ET sample achieving a tensile strength of 1 230 MPa.The longitudinal sample exhibits superior plasticity,with the CL sample exhibiting the highest elongation of 16.5％.Compared with the core samples,the longitudinal samples contained 5％more equiaxed αp phase,whereas the edge samples present smaller dimensions of the lamellar secondary αs phase.Fractography reveals typical ductile fracture characteristics with uniformly distributed dimples.Further characterization of tensile fracture cross-sections reveals three types of void formation:within αp,at the αp-β interface,and within the β phase.关键词
TC18钛合金/大尺寸棒材/拉伸性能/韧性断裂/断裂机制Key words
TC18 titanium alloy/large bar/tensile properties/ductile fracture/fracture mechanism分类
矿业与冶金引用本文复制引用
杨草,张林嘉,赵彦妮,唐斌..高强钛合金大尺寸棒材芯表横纵组织与性能研究[J].铸造技术,2025,46(9):882-887,6.基金项目
国家重点研发计划(2021YFB3702603) （2021YFB3702603）
