摘要
利用激光选区熔化技术(Selective Laser Melting,SLM)制备TC4合金,使用电子万能试验机、扫描电子显微镜、光学显微镜等设备研究了热等静压后SLM TC4合金不同取样方向(垂直和水平)的组织形貌与拉伸性能,并与合金的退火态进行对比分析。结果表明:TC4合金在进行热等静压处理后,沿打印方向(垂直)显示为延伸的β柱状晶结构,而在垂直打印方向(水平)显示为等轴晶形貌,柱状晶内为α集束与α+β网篮组织混合形貌,不同于退火态,热等静压后合金的α板条变宽,长径比减小;相对于退火态,热等静压后合金水平和垂直方向强度及塑性无明显各向异性,垂直和水平方向试样抗拉强度分别为965和975 MPa,断后伸长率分别为15.5%和16.5%,综合力学性能优异;拉伸断口呈韧窝特征,断裂机制为韧性断裂。
TC4 alloy was fabricated using the Selective Laser Melting(SLM)technique,and its microstructural morphology and tensile properties after hot isostatic pressing(HIP)were investigated in different sampling directions(vertical and horizontal)using a universal testing machine,scanning electron microscope,and optical microscope.A comparative analysis was conducted with the annealed state of the alloy.The results show that after HIP,the TC4 alloy exhibits an elongatedβcolumnar grain structure along the printing direction(vertical),while an equiaxed grain morphology is observed in the direction perpendicular to the printing(horizontal).Within the columnar grains,a mixed microstructure ofαlaths andα+βbasketweave structures is present.Compared to the annealed state,theαlaths in the HIP-treated alloy become wider,and the aspect ratio decreases.In contrast to the annealed state,the strength and plasticity of the HIP-treated alloy exhibit no significant anisotropy between the horizontal and vertical directions.The ultimate tensile strengths in the vertical and horizontal directions are 965 MPa and 975 MPa,respectively,while the elongations after fracture are 15.5%and 16.5%,respectively,demonstrating excellent overall mechanical properties.The tensile fracture surfaces exhibit dimples,indicating a ductile fracture mechanism.
作者
武亮亮
许瑞达
焦泽辉
于慧臣
WU Liangliang;XU Ruida;JIAO Zehui;YU Huichen(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Key Laboratory of Aeronautical Materials Testing and Evaluation,Aero Engine Corporation of China,Beijing 100095,China)
出处
《材料科学与工艺》
北大核心
2025年第6期43-49,共7页
Materials Science and Technology
基金
国家重点研发计划(2017YFB0702004)
财政部稳定支持基础研究计划基金项目(KZ0C190727)
中国航发科技创新平台项目(CXPT-2023-035)。
