富铜纳米析出相在18Cr9Ni3CuNbN奥氏体耐热钢中的时效强化

材料热处理学报, 2011, 32(4): 58-63.

富铜纳米析出相在18Cr9Ni3CuNbN奥氏体耐热钢中的时效强化

迟成宇 ^1, , 于鸿壵 ^2, , 董建新 ^3, , 陈梦谪 ^4, , 谢锡善 ^5,

1.北京科技大学材料科学与工程学院,北京,100083

2.北京科技大学材料科学与工程学院,北京,100083

3.北京科技大学材料科学与工程学院,北京,100083

4.北京科技大学材料科学与工程学院,北京,100083

5.北京科技大学材料科学与工程学院,北京,100083

基金项目: 国家自然科学基金重点项目(50931003)

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

Precipitation strengthening of Cu-rich nano-phase in 18Cr9Ni3CuNbN heat-resistant steel

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.

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