EFFECT OF β-FLECKS ON MECHANICAL PROPERTIES OF Ti-10V-2Fe-3Al ALLOY

Effect of β-flecks on properties of tensile elongation and low cycle.fatigue life at room tern. perature for Ti-10V-2Fe-3Al alloy has been investigated.The cracks along initial β-grain boundaries in the β-fleck region may propagate to form intergranular brittle fracture.Under alternating load,the β-fleck often becomes a fatigue origin.While under higher strain,the cracks initiate and propagate to fracture early at the original β-grain boundaries in β-fleck region and at α-grain boundaries.

β斑点对Ti-10V-2Fe-3Al合金性能的影响

研究了β斑点对Ti-10V-2Fe-3Al合金的室温拉伸性能和低周疲劳性能的影响,发现在β斑点区内,裂纹沿原始β晶界扩展形成沿晶脆性断裂,在交变应力作用下,β斑点往往成为疲劳源点,在高应变下,β斑区内的原始β晶界和晶界α处萌生裂纹并导致早期断裂。

TC11合金大规格棒材异常组织分析

对TC11合金大规格棒材异常组织进行了分析。结果表明,异常组织为片状α和β相组成的编织状组织。与基体组织相比该区域显微硬度高,微区成分Mo元素含量高、Al元素含量低。该异常组织是由于铸锭微区成分不均匀性在精锻过程中产生局部温升形成的β斑。