钛合金微结构力学性能和氢扩散分析

Mechanical Properties and Hydrogen Diffusion Analysis of Titanium Alloy Microstructure

为了获得钛合金微结构组织不均匀性对氢扩散以及力学性能的影响,建立多晶体微结构模型,运用Voronoi图剖分原理生成随机晶粒,分析加载载荷、晶粒取向、晶粒大小和材料属性对微结构力学性能和氢扩散的影响。结果表明:载荷对氢扩散有促进作用,对应力集中无影响;晶体取向是微结构应力分布不均的主要原因,晶粒尺寸越大应力集中越严重;相同载荷下,β钛合金比α钛合金的应力集中更明显,且氢容易在β钛合金中富集。

In order to study the influence of microstructure heterogeneity of titanium alloy on hydrogen diffusion and mechanical properties,a polycrystalline microstructure model is established.The random grains are generated by the Voronoi diagram subdi⁃vision principle,and the influences of the microstructural mechanical properties and hydrogen diffusion on the loading load,grain orientation,grain size and material are analyzed.The results show that the load can promote the hydrogen diffusion and has no effect on the stress concentration.The crystal orientation is the main reason for the uneven stress distribution in the micro⁃structure,and the larger the grain size,the more serious the stress concentration.Under the same load,the stress concentration in theβ-titanium alloy is more obvious than that in theα-titanium alloy,and the hydrogen is more easily enriched in theβ-ti⁃tanium alloy.