Comparison on microstructure and mechanical properties of TP347HFG steel tubes served for different terms

doi:10.13251/j.issn.0254-6051.2024.05.002

Abstract

Abstract: Microstructure and mechanical properties of the TP347HFG high-temperature reheater steel tubes were studied comparatively in supplied state and that serviced for about 50 000 h and 110 000 h at 600 ℃, respectively. The results show that for the TP347HFG steel tube serviced for 50 000 h, normal austenite grain growth takes place, and the accompanying precipitation of the tiny M₂₃C₆ particles leads to the increase of dispersion strengthening effect, resulting in the yield strength higher than that of the steel tube in supplied state. However, the microstructure of the TP347HFG steel tube serviced for 110 000 h is severely degenerated with some abnormally growing austenite grains. Moreover, the coarse M₂₃C₆ particles have an increased separation effect on grain boundaries, resulting in a significant decrease of mechanical properties at room temperature and high temperature. Moreover, with the service time increasing, the impact properties and plastic deformation characteristics at fracture of the TP347HFG steel tube are continuously degraded, and the effect of microstructure aging on mechanical properties of the TP347HFG steel tubes in service for different terms turns to be more pronounced.

Key words: TP347HFG heat resistant steel tube, long-term service, microstructure, mechanical properties

CLC Number:

TG142.7

Bao Zheng, Cheng Xiang, Wang Ruomin, Miao Chunhui, Chen Guohong, Tang Wenming. Comparison on microstructure and mechanical properties of TP347HFG steel tubes served for different terms[J]. Heat Treatment of Metals, 2024, 49(5): 10-16.

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