EFFECT OF Nb ON LONG-TIME AGING STABILITY OF AN AUSTENITIC HEAT-RESISTING STEEL 37Mn31Al3Cr2MoVWMNbB.

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作者
Zhang, Futian [1 ]
Su, Lijuan [1 ]
Zhang, Yanshen [1 ]
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[1] Acad Sinica, Inst of Metal Research,, Shenyang, China, Acad Sinica, Inst of Metal Research, Shenyang, China
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AGING OF MATERIALS - CARBIDES - METALS AND ALLOYS - Additives - NIOBIUM AND ALLOYS - NIOBIUM COMPOUNDS;
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摘要
The effect of the Nb content on 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 degree C. The coarse, prior NbC deteriorates the structural stability and promotes the decomposition of the matrix and the growth of the -phase, which embrittles the steel.
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