Abstract: The microstructure of 00Cr29Ni6Mo2N super duplex stainless steel solution-treaded at 1080 ℃ for 30 min + aged at 650 ~ 1000 °C for 60 min is investigated by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). The experimental results indicate that Cr₂N and ct phase precipitate at the ferrite/ austenite interface and an amount of Cr₂N precipitates within the ferrite grain. The precipitation of the Cr₂N occurs before the ct phase, the increase in aging temperature and aging time do not obviously affect on the amount of Cr₂N precipitate, but the fraction of the ct phase increases firstly and then decreases with increasing the aging temperature, as aging at 850°C the σ-phase area percentage content is maximum,up to 5.8% ,and at given aging temperature with aging time increasing the σ-phase content increases. Precipitated Cr₂N and a phase both reduce the pitting potential of 00Ci29Ni6Mo2N super duplex stainless steel.

Key words: >, Duplex Stainless Steel 00Cr29Ni6Mo2N, Aging Treatment, Precipitated Phase

摘要： 采用扫描电镜和X射线能谱仪研究了00Cr29Ni6Mo2N超级双相不锈钢1080 ℃ 30 min固溶+650~1 000℃ 60 min时效后的显微组织。试验结果表明，在奥氏体和铁素体相界面上析出了Cr₂N和σ相两种析出相，同时发现少量的Cr₂N在铁素体相内。Cr₂N析出优先于σ相，增加时效温度和时间对Cr₂N的析岀量没有显著影响，但σ相含量随着时效温度的升高先增加后减少,850 °C时效σ-相面积百分含量最大，达5. 8%，同时在给定时效温度下随时效时间增加σ-相含量增加。Cr₂N和σ相的析出均降低了00Cr29Ni6Mo2N超级双相不锈钢的耐点蚀性能。

关键词: 双相不锈钢, 00Cr29Ni6Mo2N, 时效, 析出相