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旋转电磁场对BFe10-1-1合金管坯组织及力学性能的影响 总被引:1,自引:0,他引:1
研究旋转电磁场对水平连铸空心BFe10-1-1合金管坯凝固组织和力学性能的影响,并对其机理进行初步的探讨。结果表明:在工频旋转电磁场的搅拌作用下,BFe10-1-1合金管坯的凝固组织显著细化,由粗大的柱状晶完全转化为均匀细小的等轴晶,同时抑制了Ni元素的枝晶偏析;施加电磁场后管坯的力学性能得到明显改善,当励磁电流为80 A时,管坯抗拉强度提高了15.3%,屈服强度提高了10.9%,伸长率提高了58.6%。 相似文献
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Influence of rare earth elements on corrosion resistance of BFe10-1-1 alloys in flowing marine water
The corrosion behavior of BFe10-1-1 alloy with different rare earth (RE) contents in simulated flowing marine water was investi-gated by X-ray diffractometer and scanning electron microscope (SEM). It was demonstrated that the corrosion rate of BFe10-1-1 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, BFe10-1-1 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 CeNi5- 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. 相似文献
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