当前位置：首页 > 过刊浏览->2025年46卷第9期
高强钛合金大尺寸棒材芯表横纵 组织与性能研究
Study of the Microstructureand MechanicalPropertiesof Large-sized High-strengthTitaniumAlloy Bars: Core and Surfacein the Longitudinal and TransverseDirections
浏览(8) 下载(0)
- DOI:
- 作者:
- 杨草 1，2，张林嘉 1，3，赵彦妮 4，唐斌 1
YANG Cao1,2,ZHANG Linjia1,3,ZHAO Yanni4,TANG Bin1
- 作者单位:
- 1. 西北工业大学 材料学院，陕西 西安 710072；2. 中国航发贵州黎阳航空发动机有限公司，贵州 贵阳 550014；3. 海装广 州局驻贵阳地区军事代表室，贵州 贵阳 550000；4. 陕西天成航空材料股份有限公司，陕西 咸阳 712023
1. School of Materials Science and Engineering, Northwest Polytechnical University, Xi′an 710072,China; 2. AECC Guizhou Liyang Aero Engine Co., Ltd., Guiyang 550014,China; 3. Guiyang Military Representative Office of Guangzhou Bureau of Naval Armament Department, Guiyang 550000,China; 4. Shaanxi Tiancheng Aerospace Co., Ltd., Xianyang 712023,China
- 关键词:
- TC18 钛合金；大尺寸棒材；拉伸性能；韧性断裂；断裂机制
TC18 titanium alloy; large bar; tensile properties; ductile fracture; fracture mechanism
- 摘要:
- 聚焦于直径 400 mm 的 TC18 钛合金大尺寸棒材，系统研究其芯表横纵 4 个位置的拉伸性能、组织特征、断口形貌及断口剖面空洞特征。 结果显示，边缘试样强度优势明显，其中边横 ET 试样抗拉强度可达 1230 MPa；纵向试样塑性更优，中纵 CL 试样伸长率最高达 16.5%。 组织定量分析表明，纵向试样等轴 αp 相占比较横向试样多 5%，且边缘试样片状次生 αs 相的长度和宽度尺寸均小于芯部试样。 断口形貌表征发现，其微观形貌均由韧窝构成，呈现出典型的韧性断裂特征。 进一步对拉伸后剖面进行表征发现存在 αp 内、αp 与 β 边界及 β 相 3 种空洞形成现象。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 edgelongitudinal (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.