研究了淬火700℃回火的20Cr11MoVNbNB钢在550—650℃时效0—5000h的强度、硬度随L-M参数P=T(20+1gt)的关系曲线出现转折的现象.发现转折的原因是:(1)该钢的主要沉淀相M_(23)C_6的平均尺寸明显粗大化;(2)Iaves相MoFe_2的析出;(3)基体中固溶 Mo量明显减少;(4)基体发生明显回复和再结晶。
Study was made on the swerving of strength and hardness vs parameter P=T(20+lg t) curves of L-M for long-time aged 20Cr11MoVNbNB steel at 550, 600,650℃, where T being aging temperature in K and t being aging time in h. It seems obviously due to: (1) coarsening of mean size of principal precipitate M_(23)C_(6), (2) precipitation of Laves phase MoFe_2, (3) decrease of solution Mo content in matrix and (4) recovery and recrystallization occurred.
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