18Cr9Ni3CuNbN奥氏体耐热钢中富Cu相的早期析出行为

doi:10.11901/1005.3093.2014.610

材料研究学报

2015, Vol. 29

Issue (3): 195-200 DOI: 10.11901/1005.3093.2014.610

本期目录 | 过刊浏览

18Cr9Ni3CuNbN奥氏体耐热钢中富Cu相的早期析出行为

于鸿垚¹,迟成宇²

1. 钢铁研究总院高温材料研究所北京 100081
2. 中国电力投资集团公司中电投核电技术中心(北京)有限公司北京 100044

Precipitation Behavior of Cu-rich Phase in 18Cr9Ni3CuNbN Austenitic Heat-Resistant Steel at Early Aging Stage

Hongyao YU^1,^**,Chengyu CHI²

1. High Temperature Materials Research Institute, Central Iron & Steel Research Institute, Beijing 100081, China
2. CPI Nuclear Power Institute, China Power Investment Corporation, Beijing 100044, China

引用本文:

于鸿垚,迟成宇. 18Cr9Ni3CuNbN奥氏体耐热钢中富Cu相的早期析出行为[J]. 材料研究学报, 2015, 29(3): 195-200.
Hongyao YU, Chengyu CHI. Precipitation Behavior of Cu-rich Phase in 18Cr9Ni3CuNbN Austenitic Heat-Resistant Steel at Early Aging Stage[J]. Chinese Journal of Materials Research, 2015, 29(3): 195-200.

全文: PDF(2445 KB) HTML

摘要:

应用三维原子探针技术研究了600℃超超临界电站锅炉过热器/再热器用18Cr9Ni3CuNbN奥氏体耐热钢中强化相富Cu相的早期析出行为, 并绘制出富Cu相在18Cr-9Ni型奥氏体耐热钢中的C曲线。结果表明: 在高温时效过程中富Cu相无论在650℃还是在700℃均能较快地析出, 其形成过程都是在短时间内先形成富Cu偏聚区, 随着时效时间的延长Cu原子继续扩散到富Cu偏聚区, 其它原子如Fe, Cr, Ni等则被排出富Cu偏聚区而扩散到奥氏体基体中, 最终形成富Cu相。

关键词 ：金属材料, 奥氏体耐热钢, 18Cr9Ni3CuNbN, 三维原子探针技术, 富Cu相, C曲线

Abstract：

The precipitation behavior of the strengthening precipitate Cu-rich phase at the early aging stage in 18Cr9Ni3CuNbN austenitic heat-resistant steel, which is commonly used as tubes for superheater and /or reheater at 600℃ of USC power plants, has been investigated by three dimensional atom probe (3DAP), and C curve of Cu-rich phase in 18Cr-9Ni type steel has been given. Experimental results show that the Cu-rich phase precipitates quickly at the early stage of long-term aging treatment at both 650℃ and 700℃. The Cu-rich segregation clusters quickly form and then the Cu atoms diffuse from the g-matrix into the Cu-rich segregation clusters. The atoms of Fe, Cr and Ni from Cu-rich clusters defuse outwards to the g-matrix simultaneously, finally the Cu-rich phase forms.

Key words： metallic materials austenitic heat-resistant steel 18Cr9Ni3CuNbN 3DAP Cu-rich phase C curve

收稿日期: 2014-10-21

基金资助:* 国家自然科学基金资助项目50931003。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.610 或 https://www.cjmr.org/CN/Y2015/V29/I3/195

表1 18Cr9Ni3CuNbN耐热钢及S实验钢的化学成分(质量分数, %)

图1 富Cu相在S实验钢中的C曲线

图2 S实验钢在650℃时效不同时间后富Cu颗粒3DAP结果

图3 S实验钢在650℃时效不同时间后富Cu颗粒3DAP结果

图4 S实验钢在650℃时效不同时间后基体和富Cu颗粒中Cu, Fe, Cr 和Ni元素浓度分布

图5 S实验钢时效后富Cu颗粒3DAP结果

图6 S实验钢在700℃时效1 h后富Cu颗粒3DAP结果

图7 S实验钢700℃时效1 h后基体和富Cu颗粒中Cu, Fe, Cr和Ni元素浓度分布

图8 在18Cr-9Ni型奥氏体耐热钢S短时时效过程中富Cu相平均半径的变化

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