表层渗碳对N36锆合金管坯耐腐蚀性能的影响
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摘要
将表面含轧制润滑油脂的N36锆合金管坯在560℃下通过真空热处理方式渗碳,将未经渗碳的N36管坯作为对照,逐层取样分析碳、氧、氮、氢元素含量,用高压釜在400℃、10.3MPa高温高压水蒸气环境下进行3d与14d的腐蚀试验,用扫描电镜观察显微组织。结果表明,表层碳含量增加会导致锆合金耐腐蚀性能下降,其原因在于碳含量增加导致锆合金热处理时析出的β Nb第二相尺寸增大、团聚、分布不均匀,最终引起锆合金耐腐蚀性能下降。
The N36 zirconium alloy tube billets with rolling emulsion on the surface are carburized by vacuum heat treatment at 560℃,and uncarburized N36 tube billets are used as control specimens. Both tube billets are sampled layer by layer and their carbon,oxygen,nitrogen and hydrogen contents are analyzed. The corrosion test are carried out for 3 days and 14 days separately in an autoclave at 400℃,10.3 MPa under high temperature and pressure water vapor,and the microstructure are observed by scanning electron microscopy. Results showed that increase of carbon content on the surface would reduce the corrosion resistance of zirconium alloy,because more carbon contents would enlarge the size of the second phase of β Nb precipitated,and cause agglomeration and uneven distribution during the heat treatment of zirconium alloy. Ultimately,the corrosion resistance of zirconium alloy is degraded.
The N36 zirconium alloy tube billets with rolling emulsion on the surface are carburized by vacuum heat treatment at 560℃,and uncarburized N36 tube billets are used as control specimens. Both tube billets are sampled layer by layer and their carbon,oxygen,nitrogen and hydrogen contents are analyzed. The corrosion test are carried out for 3 days and 14 days separately in an autoclave at 400℃,10.3 MPa under high temperature and pressure water vapor,and the microstructure are observed by scanning electron microscopy. Results showed that increase of carbon content on the surface would reduce the corrosion resistance of zirconium alloy,because more carbon contents would enlarge the size of the second phase of β Nb precipitated,and cause agglomeration and uneven distribution during the heat treatment of zirconium alloy. Ultimately,the corrosion resistance of zirconium alloy is degraded.
引文
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[12]李中奎,刘建章,周廉,等.新锆合金耐蚀性能研究[J].原子能科学技术,2003,37:84-87.
[2]刘建章,赵文金,薛祥义,等.核结构材料[M].北京:化学工业出版社,2007:5-8.
[3]赵文金,周邦新,苗志,等.我国高性能锆合金的发展[J].原子能科学技术,2005,39(增):2-9.
[4]周邦新.改善锆合金耐腐蚀性能的概述[J].金属热处理学报,1997,18(3):8.
[5]李强,刘文庆,周邦新.变形及热处理对Zr-Sn-Nb合金中βZr分解的影响[J].稀有金属材料与工程2002,31(5):389-392.
[6]刘文庆,李强,周邦新,等.热处理制度对N18新锆合金耐耐腐蚀性能的影响[J].核动力工程,2005,26(3):249-253.
[7]刘文庆,李强,周邦新,等.显微组织对ZIRLO锆合金耐腐蚀性的影响[J].核动力工程,2003,24(1):33-36.
[8]鲁艳萍,姚美意,周邦新.热处理对N36锆合金腐蚀与吸氢性能的影响[J].上海大学学报2008,14(2):194-199.
[9]LIN Y P,WOO O T. Oxidation of βZr and related phases in Zr-Nb alloy:an electron microscopy investigation[J]. J Nucl Mat,2000,277:11-27.
[10]PECHEUR D. Oxidation ofβNb and Zr(Fe,V)2 precipitates in oxide films formed on advanced Zr-based alloys[J]. J Nucl Mat,2000,278:195-201.
[11] JEONG Y H, LEE K O, KIM H G. Correlation between microstructure and corrosion behavior of Zr-Nb binary alloy[J]. J Nucl Mater,2002,302:9-19.
[12]李中奎,刘建章,周廉,等.新锆合金耐蚀性能研究[J].原子能科学技术,2003,37:84-87.
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