【摘要】 分析了ZTC4钛合金铸件典型孔洞缺陷的特征形貌及能谱，观察热等静压处理前后铸件内部典型气μμ缩孔缺陷的显微组织、定量分析α片层厚度和显微硬度，结果表明：热等静压处理后ZTC4钛合金铸件组织αμμ片层厚度明显增大，气缩孔缺陷附近的α片层厚度由1.81 m增大至1.5的显微硬度由319 HV降低至316 HV，这是由于气缩孔内部气体O、N元素在热等静压过程中扩散至临近缺陷组织，导致缺陷附近组织显微硬度进一步提升，而铸件片层组织粗化使得远离缺陷处显微硬度有所下降。更多还原

【Abstract】 Through the characteristic morphology and EDS analysis of typical hole defects in ZTC4 titanium alloy castings,as well as the microstructure observation, the quantitative analysis of α lamella thickness and microhardness of typical gasshrinkage cavity defects in the castings before and after hot isostatic pressing(HIP), the results show that the thickness of αlamella in ZTC4 titanium alloy castings increases significantly after HIP treatment, the thickness of α lamella near the gasshrinkage cavity defect increases from 1.8 μm to 2.2 μm, and the thickness of α lamellar far from the defect increases from 1 μm to 1.5 μm. After HIP treatment, the microhardness near the gas-shrinkage cavity defect increased from 353 HV to 365HV, and the microhardness far from the gas-shrinkage cavity defect decreased from 319 HV to 316 HV. In the process of HIP,the microhardness of the structure near the gas-shrinkage cavity defect is further increased due to the gas containing O and N elements from gas-shrinkage cavity diffusion to the adjacent defect structure, while the coarsening of the lamellar structure of the casting reduces the microhardness far from the gas-shrinkage cavity defect.更多还原