迟成宇,于鸿垚,董建新,陈梦谪,谢锡善

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

采用SEM、TEM和3DAP(原子层析技术)的综合分析方法并结合显微硬度测试对18Cr9Ni3CuNbN(超级304)奥氏体耐热钢的商用钢管650℃长期时效后的样品进行分析。结果表明,超级304钢时效1 h后Cu原子即发生偏聚形成富Cu偏聚区为随后的富Cu相析出做好成分上的准备(浓度起伏),随时效时间的延续富Cu原子偏聚区中Fe,Cr,Ni等原子浓度不断稀释并扩散到基体中,Cu的浓度不断增长而逐渐成为富Cu相中的最主要的组成元素。富铜相在时效初期以几个纳米的小颗粒弥散析出,在长大过程中满足扩散控制的抛物线规律,且长时间与基体保持共格关系,即使到650℃,10000 h长期时效后富Cu相仍保持在30 nm左右的小尺寸而发挥其优异的弥散强化效果。

关键词(KeyWords)： 超超临界电站(USC);超级304奥氏体耐热钢;富Cu相;析出强化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(50931003)

作者(Author): 迟成宇,于鸿垚,董建新,陈梦谪,谢锡善

DOI: 10.13289/j.issn.1009-6264.2011.04.016

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