(1. 北京科技大學(xué) 材料先進制備技術(shù)教育部重點實驗室，北京 100083；
2. 北京科技大學(xué) 現(xiàn)代交通金屬材料與加工技術(shù)北京實驗室，北京 100083)
摘 要: 研究Fe含量(1.05%~2.44%，質(zhì)量分數(shù))對CuNi10FeMn1合金組織、微觀偏析、耐海水沖刷腐蝕性能和力學(xué)性能的影響，采用SEM、能譜和XPS等手段分析合金的腐蝕產(chǎn)物膜。結(jié)果表明：CuNi10FeMn1合金中Ni、Fe元素易于富集在枝晶干，Mn元素易于富集在枝晶間；隨著Fe含量的增加，合金組織明顯細化，α固溶體中的Fe含量增加；當Fe含量從1.05%增大至1.80%時，Ni、Fe元素的偏析比分別由0.49和0.45增大到0.77和0.61，偏析程度下降；當Fe含量繼續(xù)增大時，Ni、Fe元素的偏析比則下降為0.62~0.65和0.49~0.51，偏析程度也隨之增加。隨著Fe含量的增加，合金的腐蝕速率呈先減小后增大的趨勢，當Fe含量為1.80%時，合金腐蝕速率最小，表面形成致密的、缺陷較少的富Fe、Ni的腐蝕產(chǎn)物膜，對基體的保護作用增強，是其具有良好耐海水沖刷腐蝕性能的主要原因。隨著Fe含量的增加，CuNi10FeMn1合金的抗拉強度和屈服強度由Fe含量為1.05%時的245和90 MPa分別增大到Fe含量為2.44%時的303和151 MPa，而斷后伸長率由39.2%下降到32.8%。
關(guān)鍵字: CuNi10FeMn1合金；Fe含量；微觀偏析；沖刷腐蝕性能
（1. Key Laboratory for Advanced Materials Processing, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:The effects of Fe content (1.05%-2.44%, mass fraction) on the microstructure, segregation, corrosion behavior in simulated flowing seawater and mechanical properties of the CuNi10FeMn1 alloy were investigated; and SEM, EDX and XPS were used to analyze the corrosion film of the alloy. The results show that Ni and Fe elements tend to be enriched in the dendritic region and Mn element tends to be enriched in the interdendritic region. With increasing Fe content, the microstructure refines obviously, Fe content in α solid solution increases. When the Fe content increases from 1.05% to 1.80%, the segregation ratios of Ni and Fe increase from 0.49 to 0.77 and from 0.45 to 0.61, respectively; and the segregation degree of Ni and Fe elements decreases. With further increasing Fe content, the segregation ratios of Ni and Fe decrease to 0.62-0.65 and 0.49-0.51, respectively; and the segregation degree of Ni and Fe elements increases. With the increase of Fe content, the corrosion rate of the alloy initially decreases, and then increases. When Fe content is 1.80%, the corrosion rate reaches to the minimum, dense, and the less-defect corrosion films containing rich Ni and Fe elements form on the surface of the alloy during immersion in simulated flowing seawater in order to effectively protect the α-matrix, which contributes to good flushing corrosion resistance of the alloy in seawater. With the Fe content increasing from 1.05% to 2.44%, the tensile strength of the alloy increases from 245 to 303 MPa, the yield strength increases from 90 to 151 MPa, while the elongation to failure decreases from 39.2% to 32.8%.
Key words: CuNi10FeMn1 alloy; Fe content; segregation; flushing corrosion resistance
