Precipitates change and effect on hardness of HR3C steel after long-term service

doi:10.13251/j.issn.0254-6051.2023.09.034

Abstract

Abstract: Scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscattered diffraction(EBSD) techniques were used to examine the microstructure of the un-serviced HR3C steel specimens and these with service durations of 15 501 h, 35 564 h, and 67 705 h, respectively, and hardness of the HR3C steel was measured and analyzed under the corresponding conditions. The results show that the appearance of continuously distributed and similarly sized M₂₃C₆ phases on the grain boundaries of the HR3C steel developes into an inhomogeneous coarsening chain structure as service time increasing, whereas the appearance of nanoscale secondary NbCrN and M₂₃C₆ phases in the grain and their resulting precipitation strengthening effects are the main reasons for the significant increase in hardness values of the HR3C steel.

Key words: HR3C steel, service, precipitates, hardness, strengthening mechanism

CLC Number:

TH142

Zhou Jiang, Xiang Guodong, Xu Chang, Zhang Xiancheng, Xia Xianxi, Zhu Baoyin, Zhao Yanfen, Jin Xiao. Precipitates change and effect on hardness of HR3C steel after long-term service[J]. Heat Treatment of Metals, 2023, 48(9): 203-207.

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