采用6 k W的光纤激光焊接设备对BFe30-1-1铜合金进行平板对接试验。运用正交试验的方法优化工艺参数,同时用光学显微镜(OM)、万能拉伸试验机、扫描电镜(SEM)及显微硬度仪分别对焊接接头的微观组织、抗拉强度、拉伸断口和硬度进行研究。...采用6 k W的光纤激光焊接设备对BFe30-1-1铜合金进行平板对接试验。运用正交试验的方法优化工艺参数,同时用光学显微镜(OM)、万能拉伸试验机、扫描电镜(SEM)及显微硬度仪分别对焊接接头的微观组织、抗拉强度、拉伸断口和硬度进行研究。结果表明:工艺参数对焊接接头抗拉强度影响最大的是激光功率,其次是焊接速度,离焦量的影响最小。焊缝中心组织为树枝状偏析的α固溶体,热影响区不明显。拉伸断口形貌表现均韧性断裂特征。展开更多
The corrosion behavior of BFe10-1-1 alloy with different rare earth （RE） contents in simulated flowing marine water was investigated by X-ray diffractometer and scanning electron microscope （SEM）. It was demonstra...The corrosion behavior of BFe10-1-1 alloy with different rare earth （RE） contents in simulated flowing marine water was investigated by X-ray diffractometer and scanning electron microscope （SEM）. It was demonstrated that the corrosion rate of BFel0-1-1 alloy with the same chemical compositions in faster flow velocity of marine water was higher than that in a lower flow velocity of marine water. Fixing the flow velocity, BFe 10-1-1 alloy had the best flushing corrosion resistance when the RE content was 0.04wt.%. The consequence of such good corrosion resistance was attributed to the formation of compact protective film on alloy surface containing RE phase such as CeNis. The RE-contained film combines with other corrosion products firmly, which was difficult to fall off from the alloy surface in the flowing marine water. Additionally, SEM analysis confirmed that pitting mechanism, which would be transformed to spalling mechanism gradually with further increasing RE content, was the prevalent mechanism when the alloy contained 0.04wt.%RE.展开更多
文摘采用6 k W的光纤激光焊接设备对BFe30-1-1铜合金进行平板对接试验。运用正交试验的方法优化工艺参数,同时用光学显微镜(OM)、万能拉伸试验机、扫描电镜(SEM)及显微硬度仪分别对焊接接头的微观组织、抗拉强度、拉伸断口和硬度进行研究。结果表明:工艺参数对焊接接头抗拉强度影响最大的是激光功率,其次是焊接速度,离焦量的影响最小。焊缝中心组织为树枝状偏析的α固溶体,热影响区不明显。拉伸断口形貌表现均韧性断裂特征。
基金supported by the Science and Technology Payoffs Transformation Program of Jiangsu Province (DA2006034)the Program of National College Student Creative Experiment (081053309)
文摘The corrosion behavior of BFe10-1-1 alloy with different rare earth （RE） contents in simulated flowing marine water was investigated by X-ray diffractometer and scanning electron microscope （SEM）. It was demonstrated that the corrosion rate of BFel0-1-1 alloy with the same chemical compositions in faster flow velocity of marine water was higher than that in a lower flow velocity of marine water. Fixing the flow velocity, BFe 10-1-1 alloy had the best flushing corrosion resistance when the RE content was 0.04wt.%. The consequence of such good corrosion resistance was attributed to the formation of compact protective film on alloy surface containing RE phase such as CeNis. The RE-contained film combines with other corrosion products firmly, which was difficult to fall off from the alloy surface in the flowing marine water. Additionally, SEM analysis confirmed that pitting mechanism, which would be transformed to spalling mechanism gradually with further increasing RE content, was the prevalent mechanism when the alloy contained 0.04wt.%RE.
