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对先进超超临界燃煤发电机组锅炉高温部件候选材料617合金在750℃下时效1 000,2 000,3 000和5 000h后试样的组织稳定性进行了研究。通过OM,SEM,TEM和X射线衍射等方法对时效后晶界及晶粒内的析出物进行了分析。研究发现,时效后试验材料的晶界析出M23C6碳化物;晶内析出γ′相,且γ′相呈颗粒状弥散分布,γ′相尺寸随时效时间的延长而增长。经1 000h时效后,试验材料的强度开始增加,并且随着时效时间的延长,强度开始呈现平稳趋势。随着时效时间的延长,试验材料的韧性呈下降趋势。
The microstructure of the 617 alloy high temperature components of the advanced ultra-supercritical coal-fired power plant boiler after 1000, 2000, 3000 and 5000h aging at 750 ℃ were studied. The grain boundary and grain precipitates after aging were analyzed by OM, SEM, TEM and X-ray diffraction. The results show that the M23C6 carbides are precipitated at the grain boundaries of the tested materials after aging. The γ ’phase precipitates in the grains and the γ’ phase is dispersedly distributed in granular form. The γ ’phase size grows with the aging time. After 1000h aging, the strength of the test material began to increase, and with the aging time, the strength began to show a steady trend. With the aging time, the toughness of the test materials showed a downward trend.