针对某TC6钛合金棒料加工产品在进行低倍检查时发现的黑条纹缺陷问题,为了准确判断缺陷类型,采用金相显微镜对显微组织进行观察,确定其金相组织异常区域;再用扫描电镜分析黑条纹区为富钼贫铝的化学成分偏析缺陷;通过显微硬度测试确定该黑条纹区的成分偏析为非脆性偏析.试验结果表明,按照上述方法可以有效判定TC6合金成分偏析及其类型;且确定该类型缺陷不影响使用,切除后可交货.可通过控制钛合金铸锭原料选择、混料及电极制备过程、熔炼过程中电压和电流来减少或消除此类缺陷.
For accurate judgment of the black fringe defects found by macroscopic test in TC6 titanium alloy bar,the microstructure of the alloy bar was firstly observed by metalloscope to locate the defects,then the defects were characterized by SEM,which shows that the black fringe areas are caused by segregation with higher content of Mo and lower content of Al in comparison to those of the normal areas.The microhardness testing was carried out,and the defects were determined to be non-brittle segregation.The results show that the segregation types of TC6 can be effectively judged by the methods mentioned above,and the performances of the alloy bar are not influenced by the segregation with the defect areas cut off.It is suggested that the similar defects can be decreased or eliminated by the controls of raw materials for ingot,mixing and electrodes preparation,voltage and current in melting process.
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