| 引用本文: | 李新梅,邹勇,张忠文,邹增大.Super304H奥氏体耐热钢微观组织研究[J].材料科学与工艺,2010,18(2):256-261.DOI:10.11951/j.issn.1005-0299.20100224. |
| LI Xin-mei,ZOU Yong,ZHANG Zhong-wen,ZOU Zeng-da.Microstructure and property of Super304H austenite stainless steel[J].Materials Science and Technology,2010,18(2):256-261.DOI:10.11951/j.issn.1005-0299.20100224. |
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| 摘要: |
| 为了深入认识新型奥氏体耐热钢Super304H(0.1C-18Cr-9Ni-3Cu-Nb,N)的微观组织,利用光学显微镜、扫描电子显微镜、电子探针和X射线衍射等手段,研究了Super304H钢合金元素的分布和析出相的组成及分布形态.试验结果表明,Super304H钢在供货状态下的显微组织由γ-基体和析出相组成.与传统的18-8不锈钢相比,这种奥氏体钢晶粒均匀细小,晶粒尺寸约46μm.析出相主要由Nb(C,N)和富铜相组成,Nb(C,N)有呈方向性分布的条块状和呈弥散分布的细小颗粒状两种形态,条块状的Nb(C,N)是软化过程中残留下来的,而弥散分布的是固溶处理及冷却过程中析出形成的.其中弥散分布的Nb(C,N)与富铜相对细化晶粒和改善钢的高温强度起重要作用,而多种复合强化机制使得Super304H钢具有优异的高温性能. |
| 关键词: 奥氏体耐热钢 Super304H钢 析出相 微观组织 高温性能 |
| DOI：10.11951/j.issn.1005-0299.20100224 |
| 分类号:TG142.25 |
| 基金项目:山东省电力集团公司重点科技项目(2007A-47);山东省自然科学基金资助项目(Z2006F07) |
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| Microstructure and property of Super304H austenite stainless steel |
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LI Xin-mei1, ZOU Yong1, ZHANG Zhong-wen2, ZOU Zeng-da1
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1.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education),Shandong University,Jinan 250061,China;2.Shandong Electric Power Research Institute,Jinan 250002,China
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| Abstract: |
| In order to understand the microstructure of novel austenitic heat-resistance steel Super304H (0. 1C-18Cr-9Ni-3Cu-Nb,N),the composition and morphology of precipitated phases were investigated by the means of optical microscope,scanning electron microscopy (SEM),electron probe microanalysis (EPMA) and X-ray diffraction (XRD). Results show that the microstructure of Super304H under supply condition consists of γ-matrix and other precipitated phases. Compared with conventional 18-8 stainless steel,the grain of Super304H is finer and the mean grain size is about 46 μm. The precipitated phases mainly consist of Nb(C,N) and Cu-rich phase. The micro-morphology of Nb(C,N) includes two types,which are lath-shaped and fine particles with dispersive distribution. The lath-shaped Nb(C,N) is the remains of softening process, and dispersively distributed Nb(C,N) is formed during solution treatment and cooling process. The dispersively distributed Nb(C,N) and Cu-rich phase have an important role in the improvement of high-temperature properties,and the excellent high-temperature properties of Super304H are attributed to the multiple strengthening mechanisms. |
| Key words: austenite stainless steel Super304H precipitation microstructure high-temperature properties |
