Effect of microstructure on long-term aging stability of 2.25Cr-1Mo steel

doi:10.13251/j.issn.0254-6051.2020.02.003

Abstract

Abstract:

The stability of microstructure and mechanical properties of 2.25Cr-1Mo steel with different morphology during long-term aging at 530 ℃ for 2000 h were studied by means of mechanical properties test, microstructure analysis and phase analysis. The results show that as the normalizing cooling rate decreases, the content of large-sized equiaxed ferrite increases and the bainite content decreases. When the content of bainite in the microstructure is high, the strength and toughness of the steel are well matched, and the coarsening of secondary phase carbide is not obvious in the aging process, the microstructure stability is higher. The strength of large-sized equiaxed ferrite matrix is low, and in the aging process the interface carbide has a fast coarsening and aggregation rate and distributes along grain boundary, the microstructure stability is poor. The ferrite content is >40%, and the aging embrittlement phenomenon is remarkable.

Key words: 2.25Cr-1Mo steel, normalizing cooling rate, microstructure, long-term aging, aging embrittlement

CLC Number:

TG142.1

Han Shaoqiang, Zhao Jiqing, Wan Rundong, Yang Gang. Effect of microstructure on long-term aging stability of 2.25Cr-1Mo steel[J]. HTM, 2020, 45(2): 11-18.

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