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Challenges in optimizing the resistance to corrosion and wear of amorphous Fe-Cr-Nb-B alloy containing crystalline phases
Journal of Non-Crystalline Solids ( IF 3.5 ) Pub Date : 2020-11-12 , DOI: 10.1016/j.jnoncrysol.2020.120537
G.Y. Koga , T. Ferreira , Y. Guo , D.D. Coimbrão , A.M. Jorge Jr , C.S. Kiminami , C. Bolfarini , W.J. Botta

The conflicting role of crystalline phase on the corrosion and wear resistance of the glass former Fe66Cr10Nb5B19 alloy was investigated. Amorphous to crystalline structures were produced by amorphous ribbons annealing and solidification of the liquid into a wedge-shaped copper mold. Amorphous and amorphous/nanocrystalline microstructures displayed good balance of properties. Their corrosion resistance remained elevated since α-(Fe,Cr) and (Fe,Cr)2B crystals were non-percolated within the corrosion-resistant amorphous matrix. Wear resistance was still high because (Fe,Cr)2B is even harder than the amorphous matrix. Crystalline microstructures were resistant against wear thanks to the large fraction of (Fe,Cr)2B and (Fe,Cr)NbB, both effective to protect the softer α-(Fe,Cr) matrix. Their corrosion resistance, however, was severely compromised, given the elemental partitioning to form crystals, with the interfaces more prone to corrode. While amorphous and amorphous/nanocrystalline microstructures presented the best-combined resistance to corrosion and wear, the crystalline microstructures are interesting for load-bearing applications where high corrosion resistance is not required.



中文翻译:

优化含结晶相的非晶态Fe-Cr-Nb-B合金的耐腐蚀和耐磨性方面的挑战

研究了结晶相对玻璃原铁66 Fe 66 Cr 10 Nb 5 B 19合金的腐蚀和耐磨性的冲突作用。非晶态的晶体结构是通过非晶态的碳带退火和液体凝固成楔形的铜模而产生的。非晶和非晶/纳米晶体的微观结构表现出良好的性能平衡。由于α-(Fe,Cr)和(Fe,Cr)2 B晶体在抗腐蚀非晶基质中没有渗透,因此它们的抗腐蚀能力仍然得到提高。耐磨性仍然很高,因为(Fe,Cr)2B甚至比非晶基质硬。由于大部分(Fe,Cr)2 B和(Fe,Cr)NbB均有效保护了较软的α-(Fe,Cr)基体,因此晶体微结构具有抗磨损性能。然而,考虑到元素分配形成晶体,其界面更容易被腐蚀,因此其耐腐蚀性受到严重损害。尽管非晶态和非晶态/纳米晶态的微结构具有最佳的抗腐蚀和磨损性能,但对于不需要高耐蚀性的承重应用而言,这种晶态的微结构是令人感兴趣的。

更新日期:2020-11-12
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