本文研究37Mn31Al3Cr2MoVWNbB热强钢在长期时效过程中热强性能和组织结构的稳定性。在650℃长期时效后,热强性能很少下降。一次NbC的存在促使基体分解及X相的析出长大。后者使钢变脆,但对热强性能无明显影响。
The effect of Nb content on the long-time aging stability in hot strength and structure of an austenitic heat resisting steel 37Mn31Al3Cr2MoVWNbB has been investigated. It was found that the hot strength of the steel is no longer decreased and the structural stability is dependent on the shape and distribution of NbC after long-time aging at 650℃. The coarse prior NbC deteriorates the structural stability and promotes the decomposition of matrix and the growth of x-phase which embrittles the steel. Thus, it seems to be considered to cut down the Nb content in the steel.
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