Effect of Tempering on Mechanical Properties and Microstructure of a 9% Cr Heat Resistant Steel

Valeriy Dudko; Andrey Belyakov; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.706-709.841

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Tempering on Mechanical Properties and...

Effect of Tempering on Mechanical Properties and Microstructure of a 9% Cr Heat Resistant Steel

Abstract:

Effect of tempering temperature ranged from 400 to 720°C on mechanical properties and microstructure of a P92-type creep resistant steel was investigated. The hardness value of 400 HB, which was obtained after solution treatment, increased to 430 HB with increasing the tempering temperature to 525°С. Further increase in the tempering temperature resulted in gradual decrease in hardness, which approached a level of about 220 HB after tempering at 720°С. The equiaxed particles of MX-type carbonitrides with a size of about 30 nm were precipitated randomly after tempering under all conditions. At temperatures below 525°C, the tempered martensite lath structure (TMLS) was characterized by a random distribution of fine M₃C-type carbides and MX-type carbonitrides. The precipitation of M₂₃C₆ was observed after tempering at T ≥ 525°C. At 525°C, the M₂₃C₆ carbides appeared as thin films on high-angle boundaries (HAB), while M₂₃C₆ particles having almost equiaxed shape and located on various boundaries including low-angle lath boundaries precipitate at higher temperatures.

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

841-846

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.841

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Online since:

January 2012

Authors:

Valeriy Dudko, Andrey Belyakov, Rustam Kaibyshev

Keywords:

Carbide, High-Chromium Heat Resistant Steel, Martensite, Tempering

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