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利用OM,SEM和TEM研究了一种超超临界用HR3C钢在700和750℃长期时效至2000 h过程中σ相的析出行为,借助相计算方法探究了影响σ相析出的因素.结果表明,HR3C钢在700和750℃时效1000 h就有不规则块状第二相在晶界析出,且随时效时间延长而增多和粗化;EDS分析表明该相主要含Fe和Cr,结合SAED的分析结果最终确定其为σ-FeCr金属间化合物;通过相计算方法对初始态HR3C钢进行分析认为,显微组织或相结构等差异可能是影响后续σ相析出行为的原因.
The phase behavior of sigma phase in ultra-supercritical steel HR3C was studied by means of OM, SEM and TEM at the long-term aging of 700 and 750 ℃ up to 2000 h. The phase influencing factors of σ- HR3C steel at 700 and 750 ℃ aging 1000 h have irregular massive second phase precipitation at the grain boundary, and with the aging time increases and coarsening; EDS analysis shows that the main phase containing Fe and Cr, combined with SAED analysis As a result, it is finally confirmed that it is a σ-FeCr intermetallic compound. The phase HR3C steel is analyzed by phase calculation. The difference of microstructure or phase structure may be the reason that affects the subsequent precipitation of σ phase.