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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:材料研究学报

Volume:31

Issue:5

Page Number:336-344

Abstract:The composition rule of the high-performance Fe-Cr-Al-Mo-Nb alloys was investigated in light of a cluster formula approach, and then a ternary cluster formula of Fe75Al9.375Cr15.625(at.%) was determined. Mo, Nb, Ta, and Zr were added into the alloy to partially substitute for partial Cr of Fe-Cr-Al-Mo-Nb alloys. Alloy ingots were prepared by vacuum arc melting, and then solution-treated at 1200 for 2h before hot-rolled at 800 into sheets. The alloy sheets samples were aged at 800 for 24 hrs, followed by re-solution treatments at 1000, 1100 and 1200 for 1 h respectively. The microstructure and microstructural stability at high temperature of the alloy sheetssamples under various treatments were comparatively studied compared to study the HT microstructural stability of this series of alloys. The results show that the fine precipitates (Laves phase) distributed homogeneously in the ferritic matrix of the aged Mo/Nb/Ta/Zr alloy sheetsed samples. However, these particles begin to re-dissolve into the matrix after 1000 /1 h solution treatment. Moreover, these particles disappeared in the Mo/Nb containing alloy after 1200 /1 h solution, while Ta or Zr further minor-alloying could still ensure a certain amount of precipitates distributed on the grain boundaries, which effectively suppresses the abnormal growth of grains at high temperature. Therefore, the HT microstructural stability at high temperature and the resulted ant mechanical properties could be improved. © All right reserved.

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