An Investigation on 630℃ Long-term Aging Stability for FB2 Rotor Steel Used in Ultra-Supercritical Units

doi:10.12442/j.issn.1002-185X.20220577

Home > Archive>Volume 52, Issue 4, 2023 >1536-1542. DOI:10.12442/j.issn.1002-185X.20220577

An Investigation on 630℃ Long-term Aging Stability for FB2 Rotor Steel Used in Ultra-Supercritical Units
DOI:
                        10.12442/j.issn.1002-185X.20220577
                    
Author:
                        Yao Hanxin1,2Yao Hanxin
University of Science and Technology Beijing;China
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Jiang He1,2Jiang He
University of Science and Technology Beijing;China
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Yao Zhihao1,2Yao Zhihao
University of Science and Technology Beijing;China
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Dong Jianxin1,2Dong Jianxin
University of Science and Technology Beijing;China
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Affiliation:1.University of Science and Technology Beijing;2.China
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Abstract:

In present work the 630℃ long-term aging stability of FB2 rotor steel are investigated by impact test, hardness test in combine with SEM, TEM and XRD analysis. The investigation shows that impact toughness and hardness decrease with proloning aging time. The impact ductility decreases apparently after 2000 h aging and then keeps stable. The hardness stays in a high level (253 HBW). The size and amount of M₂₃C₆ carbide increases slightly during aging without apparent coarsen. The size increase of Laves phase is more obvious and Laves phase tends to gather at grain boundary. While no chain of Laves phase is observed. The coarsen and gathering of Laves phase at grain boundary is the major reason for impact toughness degeneration. Bases on the research, it can be concluded that FB2 rotor steel keeps stable at 630℃ for up to 5000 h.

Key words:Ultra-supercritical units; FB2 rotor steel; Long-term aging; M₂₃C₆ carbide

Reference

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[Yao Hanxin, Jiang He, Yao Zhihao, Dong Jianxin. An Investigation on 630℃ Long-term Aging Stability for FB2 Rotor Steel Used in Ultra-Supercritical Units[J]. Rare Metal Materials and Engineering,2023,52(4):1536~1542.]
DOI：10.12442/j. issn.1002-185X.20220577

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Received:July 11,2022
Revised:November 07,2022
Adopted:November 24,2022
Online: May 01,2023
Published: April 25,2023

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