摘要
研究了多向加载条件下闭式模锻成形的TC6钛合金三通锻件的显微组织和力学性能，采用光学显微镜及扫描电镜对比了锻件不同位置处的原始β晶粒及α相的形态，并表征了锻件各位置处的维氏硬度，进一步分析了锻造变形量对显微组织形态及显微硬度的影响。研究结果表明，闭式锻造三通锻件各位置处的显微组织及硬度存在较大差异；随着锻造变形量的增大，原始β晶粒由各向尺寸接近的多边形转变为细条状晶粒，同时晶界α相由不连续的短棒状转变为等轴状；锻造变形量越大的位置，由于显微组织细化及加工硬化作用，显微硬度越高。
Microstructure and mechanical properties of tee forging component of TC6 titanium alloy manufactured by multiway closed-die forging were studied. The microstructure of original β grains and α phase at different positions of the forging was investigated with optical microscope （OM） and scanning electron microscope （SEM）, while the microhardness values at different positions were tested, and then the influence of forging deformation on microstructure and hardness was analyzed. The result shows that the microstructure and microhard- ness values at different positions of the forging component prove to be obviously variant. With the increase of forging deformation, the mor- phology of original β grains exhibits a transition from polygon with almost the same size in all directions to tenuous shape with large length- width ratio, while α phase at grain boundary transforms from short rob-like structure to equiaxed structure. Because of the fine grain size and work-hardening effect, positions with higher forging deformation present higher microhardness values.
作者
张仕林
黄森森
马英杰
雷家峰
杨锐
ZHANG Shi-lin;HUANG Sen-sen;MA Ying-jie;LEI Jia-feng;YANG Rui(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Department of Materials Science ＆ Engineering, University of Science and Technology of China, Shenyang 110016;School of Materials Science ＆ Engineering, Northeastern University, Shenyang 110006, China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第2期161-167,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51401221)
关键词
TC6钛合金
多向闭式模锻
显微组织
显微硬度
TC6 titanium alloy
muhiway close-die forging
microstructure
microhardness
