Microstructures and high temperature properties of high Nb ferritic stainless steels for exhaust system

Li Wei; Bai Qingqing

doi:10.7513/j.issn.1004-7638.2024.02.019

Volume 45 Issue 2

Feb. 2024

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Li Wei, Bai Qingqing. Microstructures and high temperature properties of high Nb ferritic stainless steels for exhaust system[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(2): 132-138. doi: 10.7513/j.issn.1004-7638.2024.02.019

Citation:

Li Wei, Bai Qingqing. Microstructures and high temperature properties of high Nb ferritic stainless steels for exhaust system[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(2): 132-138. doi: 10.7513/j.issn.1004-7638.2024.02.019

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Microstructures and high temperature properties of high Nb ferritic stainless steels for exhaust system

doi: 10.7513/j.issn.1004-7638.2024.02.019

Li Wei^{1, 2},
Bai Qingqing^{2, 3}

1.
Pansteel Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
State Key Laboratory of Metallic Materials for Marine Equipment and Application, Anshan 114009, Liaoning, China
3.
Chengdu Advanced Metallic Materials Industry Technology Research Institute Co., Ltd., Chengdu 610303, Sichuan, China

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Received Date: 2023-06-26
Available Online: 2024-04-30
Publish Date: 2024-04-30

Abstract

Abstract

During the research and development of new hot end materials for automobile exhaust system, annealing experiments, grain coarsening resistance experiments, aging resistance experiments, high temperature tensile and high temperature creeping experiments were carried out on the experimental steels in order to explore the influence of Nb contents on steels microstructures and properties. OM and SEM were used to characterize the microstructural evolution of the experimental steels in each process, and the influence of Nb content on the properties was evaluated by tensile tests and SAG test-Creeping tests. The results show that the increase of Nb content can lead to more precipitates to refine the grains and provide precipitation strengthening as well as improve the room temperature mechanical properties. The effect of high Nb content on grain coarsening is more obvious, but the coarsening of precipitates at the same time leads to a greater decline in properties after aging. The high temperature strength of the experimental steels with high Nb content decreases due to the influence of dynamic recrystallization and a large number of Laves phases. At the same temperature, the creep resistance of experimental steels with different Nb contents has little difference. With the increase of temperature, the precipitates coarsen seriously and the creep resistance decreases.
- ferritic stainless steel,
- high temperature strength,
- precipitates,
- creep

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References(13)

References

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