摘要
利用电子背散射衍射(EBSD)技术对Ф500 mm TC17钛合金棒材显微组织的均匀性进行了研究,分析了不同部位α、β相的晶体取向。结果表明,棒材边部和心部的初生α相等轴化良好,取向分布均匀;锻后冷却速度会影响棒材边部和心部组织中等轴α相的晶粒尺寸,心部显著大于边部。在光学显微镜下原始β晶界不明显,但心部组织中出现β相基本保持取向一致的"宏区",说明原始β晶粒破碎程度不足。对于大规格TC17钛合金棒材,仅凭借显微组织判定其均匀性存在漏洞,需增加β晶粒度检查以规避后续出现粗大原始β晶粒的风险。
Electron backscattered diffraction(EBSD) technique was employed to investigate the homogeneity of microstructure of Ф500 mm TC17 titanium alloy bar and analyze the orientation of α and β phases in different regions. The results show that the primary α phase of the edge and core are excellent equiaxed grains and have uniform distribution on orientation. The grain size of equiaxed α phase of the core is significantly larger than the edge caused by the cooling rate after forging. The prior β grain boundary is not significant under the optical microscope, but the macro region of the β phase basically keeping the same orientation appeared in the core, indicating that the prior β grain broken degree is insufficient. Therefore, only using the microstructure to determine the homogeneity is not enough for large size TC17 titanium alloy bars. The inspection of β grain size should be increased to avoid the risk of subsequent occurrence of coarse prior β grain.
作者
邓雨亭
李四清
王旭
Deng Yuting;Li Siqing;Wang Xu(Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Aviation Key Laboratory on Advanced Titanium Alloys of AECC,Beijing 100095,China)
出处
《钛工业进展》
CAS
2021年第5期10-13,共4页
Titanium Industry Progress
