Improve creep properties of reduced activation steels by controlling precipitation behaviors

详细信息    查看全文

• 作者：Z.X. Xia^a ; ^{xiazhixin2000@163.com} ; C. Zhang^b ; N.Q. Fan^a ; Y.F. Zhao^a ; F. Xue^a ; S.J. Liu^c
• 关键词：Reduced activation steels ; Phase diagrams ; Carbide ; Microstructure ; Creep properties
• 刊名：Materials Science and Engineering: A
• 出版年：2012
• 出版时间：30 May, 2012
• 年：2012
• 卷：545
• 期：Complete
• 页码：91-96
• 全文大小：1584 K

文摘

Effect of a new heat treatment and tantalum content on precipitation behaviors and mechanical properties of reduced activation was studied in this paper. The results indicated that the combined application of adding 0.26 wt. % tantalum content and the new heat treatment in the modified steel caused a decrease in the minimum creep rate of an order of magnitude and an increase in the rupture time of nearly an order of magnitude than the traditional reduced activation steel, because the former obtained a number of the finer MX and M₂₃C₆ carbides. The prior precipitation of MX by addition of tantalum or intermediate heat treatment that caused a decrease of the growth rate and mean size of M₂₃C₆ carbides. Both adding 0.26 wt. % tantalum content and intermediate heat treatment at 850 ¡ãC were proposed for an improvement of creep properties in reduced activation steels.