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Creep Rupture Strength and Microstructural Changes due to Creep of Mod.9Cr-1Mo Steel with High Initial Hardness

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Abstract:

To investigate creep rupture properties and microstructural changes due to creep of the Mod.9Cr-1Mo steel with high initial hardness, creep rupture tests were carried out at 600°C and 650°C. The hardness of the gauge and grip portions of the ruptured specimens were also measured. This steel exhibited higher creep rupture strength than the conventional material at the two temperatures, but its creep rupture strength showed a larger decreasing tendency at 650°C. For the specimens ruptured at 600°C, an increasing tendency in lath width and a decreasing one in hardness were confirmed in gauge portions, but they were not observed in grip portions. However, for the specimens ruptured at 650°C, the hardness of both gauge and grip portions tended to decrease with the time to rupture, and the recovery of the lath structure and the coarsening of M23C6 carbides were particularly noticeable in the gauge portions.

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Periodical:

Materials Science Forum (Volume 1189)

Pages:

101-108

DOI:

https://doi.org/10.4028/p-DjXd5Q

Citation:

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Online since:

May 2026

Authors:

Li Bin Niu*, Tomohiro Mori, Yuichi Yamamoto

Keywords:

Creep, Hardness, Microstructural Change, Mod.9Cr-1Mo Steel

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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