本研究采用光学显微镜(OM)，扫描电镜（SEM），能谱分析（EDS）和透射电镜（TEM）等实验技术，分别对2205双相不锈钢在700℃，750℃时效处理0.5h、1h、2h后组织中的析出相进行分析；结果表明，在700℃时效处理的条件下，2205双相不锈钢的析出相主要是Cr2N和χ相；750℃时效处理的条件下，析出相主要由Cr2N、χ相以及σ相组成。结合室温冲击功的测量结果，随时效时间的延长，该钢的冲击功明显降低；在相同时效时间条件下，与700℃时效处理相比，经750℃时效处理后的2205钢冲击功较低，这主要是由于组织中σ相的析出造成的。
A serial ageing treatments of 2205 duplex stainless steel(DSS) at the temperature of 700℃ and 750℃ for different time intervals （0.5h，1h，2h) were carried out. Aided by optical metallography, SEM&EDS and TEM analysis, the evolution of precipitation in 2205DSS during aging treatment was determined. The results showed that the main type of precipitation in 2205DSS was Cr2N, χ phase at 700℃ aging and Cr2N, χ and σ phase at 750℃ aging. Combined with impact toughness experimental results, it was shown that the impact energy of 2205 DSS decreased with prolonged keeping time; in addition, the impact energy of 2205 DSS at 750 aging was lower than that at 700℃ aging due to the σ phase precipitated in microstructure of 2205 DSS.
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