Ti和A1含量对Fe-Ni基合金中η相析出行为的影响
EFFECTS OF Ti AND A1 CONTENTS ON THE PRECIPI- TATION BEHAVIOR OF η PHASE IN Fe-Ni BASE ALLOYS
查看参考文献26篇
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文摘
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采用OM, SEM, TEM和EPMA,对Ti和Al含量不同的Fe-Ni基合金在900—1030℃固溶温度范围内的η相析出行为进行了研究。结果表明,η相的形成与合金中的Ti含量和Al含量密切相关,提高(Ti+Al)含量或Ti/Al比,可增加η相的析出倾向;在980℃固溶处理后,低(Ti+Al)含量和Ti/Al比的合金中不存在η相,而在高(Ti+Al)含量和Ti/Al比的合金中仍存在η相;随合金(Ti+Al)含量或Ti/Al比的增加,γ'相可在更高温度存在,在高温固溶处理过程中,η相消耗合金中的γ'而析出并长大;合适的固溶温度可消除合金中的元素偏析和抑制η相的析出。 |
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其他语种文摘
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Fe-Ni base austenitic alloys have been widely used as structural materials in the hydrogen environment, which is strengthened by the precipitation of γ' [Ni3(Al, Ti)]. η phase is present after solution treatment in some modified alloys, which is detrimental to hydrogen resistance perfor- mance of alloys. In order to eliminate the η phase and optimize the alloy composition, the precipitation behavior of η phase in Fe-Ni base alloys with different Ti and Al contents was investigated in the range of 900℃ to 1030℃ using OM, SEM, TEM and EPMA. The results show that the formation ability of η phase is related to the content of Ti and Al. Increasing the (Ti+Al) content or the Ti/Al ratio in the alloys promotes the precipitation of η phase. Moreover, theηphase does not exist in alloys with the lower (Ti +Al) content or Ti/Al ratio, but still presents in the alloys with higher (Ti+Al) content and Ti/Al ratio after the standard solution treatment at 980℃,which is due to that the η phase precipitates at the expense of the γ phase existing at higher temperature. In situ microstructure observations indicate that γ phase and elemental segregation can be eliminated by the optimization of solution treatment condition. |
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来源
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金属学报
,2012,48(11):1335-1341 【核心库】
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DOI
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10.3724/sp.j.1037.2012.00232
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关键词
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Fe-Ni基合金
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η相
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固溶处理
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析出行为
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地址
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:4696444
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