运用Thermo--Calc软件进行热力学计算, 预测了一种新型9--12%Cr低活性F/M(铁素体/马氏体)实验钢的组织。对淬火回火热处理后的显微组织进行了观察, 并对析出物进行电子衍射结构分析和EDS化学成分检测。结果表明, 实验钢是典型的回火板条马氏体组织, 位于各种晶界上的析出物均为富Cr的碳化物M23C6, 其化学成分随碳化物的形貌变化而变化。对实验钢进行60%冷变形并随后在820℃退火10--300 min, M23C6在完全再结晶、奥氏体相变过程中进一步球化, Cr、W不断富集, Cr/Fe逐渐升高至2后成分趋于稳定, 化学组成接近于(Cr15Fe6W2)C6。
Thermo–Calc software was used to predict the microstructure of a new 9–12%Cr low–activation F/M steel designed for SCWR fuel cladding tube material. The microstructure of the experimental steel after quenching–and–tempering heat treatment was observed, and the chemistry and other characteristics of the precipitates were studied. The results showed that the experimental steel had a typical tempered martensitic structure. The precipitates located in various boundaries were Cr–rich carbides M23C6. After quenching and tempering, the specimens were cold deformed to a reduction of 60% and then annealed at 820 for 10–300 min. M23C6 wouldn't disappear during the process of recrystallization and transformation from ferrite to austenite at high temperature. The proportion of Cr to Fe was increasing during the process and finally reached to 2. The chemistry composition was (Cr15Fe6W2)C6.
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[5] | |
[6] | |
[7] | |
[8] | |
[9] | |
[10] |
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