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The Microstructure and Creep Strength of 403Nb Martensitic Heat-Resistant Steel

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Abstract:

The microstructure and creep strength of 403Nb martensitic heat-resistant steel after tempering at 650°C, 680°C and 730°C were analyzed by SEM and TEM. Microstructural observation shows that 403Nb steel tempered at 650°C provides a finer lath structure and a smaller size of precipitates than that tempered at 680°C or 730°C. The dislocation density is also higher in 403Nb steel tempered at 650°C. The creep rupture strength of 403Nb steel tempered at 650°C is the highest among those tempered. The main creep strengthening mechanisms in 403Nb steel usually include precipitates hardening, dislocation hardening and sub-grain boundary hardening.

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Advanced Materials, ICAMMP 2011 View Preview

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Periodical:

Advanced Materials Research (Volumes 415-417)

Pages:

896-900

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.415-417.896

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Online since:

December 2011

Authors:

Zhou Yu Zeng, Li Qing Chen, Fu Xian Zhu

Keywords:

403Nb, Creep Strength, Martensitic Heat-Resistant Steel, Microstructure

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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