Ti和Al含量对Fe-Ni基合金中$\eta$相析出行为的影响

doi:10.3724/SP.J.1037.2012.00232

金属学报

2012, Vol. 48

Issue (11): 1335-1341 DOI: 10.3724/SP.J.1037.2012.00232

论文

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Ti和Al含量对Fe-Ni基合金中$\eta$相析出行为的影响

陈胜虎, 赵明久, 戎利建

中国科学院金属研究所, 沈阳 110016

EFFECTS OF Ti AND Al CONTENTS ON THE PRECIPITATION BEHAVIOR OF η PHASE IN Fe-Ni BASE ALLOYS

CHEN Shenghu, ZHAO Mingjiu, RONG Lijian

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

陈胜虎赵明久戎利建. Ti和Al含量对Fe-Ni基合金中$\eta$相析出行为的影响[J]. 金属学报, 2012, 48(11): 1335-1341.
CHEN Shenghu ZHAO Mingjiu RONG Lijian. EFFECTS OF Ti AND Al CONTENTS ON THE PRECIPITATION BEHAVIOR OF η PHASE IN Fe-Ni BASE ALLOYS[J]. Acta Metall Sin, 2012, 48(11): 1335-1341.

全文: PDF(781 KB)

摘要:

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$\gamma'$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.

关键词 ： Fe-Ni基合金, η相, 固溶处理, 析出行为

Abstract：

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 performance of alloys. In order to eliminate the $\eta$ 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, the η phase 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 η phase and elemental segregation can be eliminated by the optimization of solution treatment condition.

Key words： Fe-Ni base alloy η phase solution treatment precipitation behavior

收稿日期: 2012-04-26

基金资助:

国家自然科学基金项目51171178和u1230118资助

作者简介: 陈胜虎, 男, 1986年生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00232 或 https://www.ams.org.cn/CN/Y2012/V48/I11/1335

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