钢铁钒钛2025，Vol.46Issue(1)：45-52,8.DOI:10.7513/j.issn.1004-7638.2025.01.007
钛合金中的一种富碳缺陷及其导致的变形开裂行为
Carbon enriched defect and the associated deformation cracking behaviors in a titanium alloy
摘要
Abstract
Since the contacting ultrasonic detection results indicated some defects existed in a bar of Ti-6Al-4V alloy,researching work had been carried out using optical microscope,scanning electron micro-scope metallographic analysis,microhardness,energy spectrum,electron probe,backscatter electron dif-fraction and other characterization methods.And uncommon carbon enriched defect had been figured out.Flecks surrounded with α stable area were observed in the microstructure.Then,it was figured out that flecks were Ti2C with ordered FCC crystal and the α stable area was hard α phase based on the chemical composition and crystallology analysis.According to the distribution characteristics of chem-ical elements,the defect source was presumed to be raw materials contaminated by elements rich in car-bon and nitrogen.Micro cracks initiated at Ti2C/α boundaries and grew into the α side in the hard α and Ti2C regions during the forging.Micro cracks would break through the Ti2C crystal bridges and merged into ultrasonically detectable macro crack defects at last.关键词
富碳缺陷/硬α相/Ti2C/裂尖桥接Key words
carbon enriched defect/hard α phase/Ti2C/grain bridge分类
矿业与冶金引用本文复制引用
郑友平,王立亚,秦海旭,耿乃涛,李露,陈炜..钛合金中的一种富碳缺陷及其导致的变形开裂行为[J].钢铁钒钛,2025,46(1):45-52,8.基金项目
国铁集团重点课题(N2023J049),国家重点研发计划项目(2023YFB3710700). （N2023J049）
