摘要
通过光学显微镜、拉伸试验机、扫描电镜、布氏硬度计等研究了不同锻造工艺对TC4钛合金组织和力学性能的影响。结果表明,初生α晶粒尺寸和体积分数、次生α形貌随锻造温度和变形程度的变化差异较大,不同锻造工艺下得到等轴组织、双态组织和片层组织。等轴组织强度较低,塑性变形能力强,属于韧性断裂机制;片层组织强度最高,塑性变形能力较差,属于准解理断裂机制;双态组织有较高的强度和塑性,综合性能最好,属于准解理断裂机制。在相同变形程度下,锻造温度由950℃升至1020℃时,硬度提高了8.5%;在相同锻造温度下,变形程度由10.7%增至69.6%时,硬度提高了4.8%。
The effects of different forging processes on the microstructure and mechanical properties of TC4 titanium alloy were studied by optical microscope, tensile testing machine, scanning electron microscope and Brinell hardness tester.The results show that the grain size and volume fraction of primary α and the morphology of secondary α vary greatly with forging temperature and deformation degree, and equiaxed structure, double-state structure and lamellar structure are obtained under different forging processes. The equiaxed structure has low strength and strong plastic deformation ability, which belongs to the ductile fracture mechanism;the lamellar structure has the highest strength and poor plastic deformation ability,which belongs to the quasi-cleavage fracture mechanism;the two-phase structure has higher strength and plasticity, and the comprehensive performance is the best, which belongs to the quasi-cleavage fracture mechanism. At the same degree of deformation, when the forging temperature increases from 950 ℃ to 1020 ℃, the hardness increases by 8.5%;at the same forging temperature, when the degree of deformation increases from 10.7% to 69.6%, the hardness increases by 4.8%.
作者
王博涵
程礼
崔文斌
李冬春
WANG Bohan;CHENG Li;CUI Wenbin;LI Dongchun(Aeronautics Engineering College,Air Force Engineering University,Xi'an 710038,China;Co-innovation Center for Advanced Aero-Engine,Beijing 100191,China)
出处
《热加工工艺》
北大核心
2021年第23期17-21,共5页
Hot Working Technology
基金
国家重点基础研究发展计划(973计划)项目(2015CB057400)。
关键词
TC4钛合金
锻造
显微组织
拉伸性能
SEM分析
硬度
TC4 titanium alloy
forging
microstructure
tensile properties
SEM analysis
hardness
