Effect of Trace Elements on Creep Properties of 0.06C-2.25Cr-1.6W-0.1Mo-0.25V-0.05Nb Steel

この論文にアクセスする

この論文をさがす

著者

抄録

The effect of trace elements such as Mn and B on creep properties of 0.06C-2.25Cr-1.6W-0.1Mo-0.25V-0.05Nb has been investigated from the standpoints of a long-term microstructural stability. The chemical analysis of extracted residues and TEM observation show that the M<sub>23</sub>C<sub>6</sub> carbide and/or M<sub>7</sub>C<sub>3</sub> carbides, precipitated by tempering are replaced by M<sub>6</sub>C with a concentration of W; <I>i.e.</I>, the amount of W in solution reduces during creep. On the other hand, MX type carbides such as VC and NbC are very stable during long-term aging and contribute to the creep strength by obstructing the dislocation annihilation. <br>One of the most significant results is that a reduction in Mn-content lowers the minimum creep rate, resulting in an increase in the creep rupture time. The nucleation and/or growth of M<sub>6</sub>C are retarded with reducing Mn-content, thereby the increase in dissolved W seems to enhance the resistance to creep deformation. Another significant result is that an increase in B-content has delayed the transition from the primary creep to a tertiary creep stage. The principal roles of B are stabilizing M<sub>23</sub>C<sub>6</sub> or M<sub>23</sub>(C, B)<sub>6</sub> on former austenite grain boundaries and retarding the dynamic recrystallization during creep. In addition, in the specimens with higher amount of B, the bainite lath interface is covered by MX and some filmy precipitates with high density, thereby the softening resistance is enhanced.

収録刊行物

  • ISIJ international  

    ISIJ international 39(9), 947-954, 1999-09 

    The Iron and Steel Institute of Japan

参考文献:  19件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  1件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

ページトップへ