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http://dx.doi.org/10.3365.KJMM.2010.48.01.039

Effects of Tempering Temperature and Heat-Treatment Path on the Microstructural and Mechanical Properties of ASTM Gr.92 Steel  

Kim, Yeon-Keun (Energy Functional Material Laboratory, Chungnam National Universty)
Han, Chang-Hee (FR Fuel Development, Korea Atomic Energy Research institute)
Baek, Jong-Hyuk (FR Fuel Development, Korea Atomic Energy Research institute)
Kim, Sung-Ho (FR Fuel Development, Korea Atomic Energy Research institute)
Lee, Chan-Bock (FR Fuel Development, Korea Atomic Energy Research institute)
Hong, Sun-Ig (Energy Functional Material Laboratory, Chungnam National Universty)
Publication Information
Korean Journal of Metals and Materials / v.48, no.1, 2010 , pp. 39-48 More about this Journal
Abstract
In order to investigate the effects of tempering temperature and heat-treatment path on the microstructural and mechanical properties of ASTM Gr.92 steels, four samples with different tempering temperatures and heat-treatment paths wer prepared. THeree experimental steels showed tempered martensitic microstructures, but the sample tempered at $810^{\circ}C$ was presumed to retain partially untempered martensitic microstructures due to a lower ${\alpha}$+${\gamma}$ phase regime. $M_{23}C_6$, V(C,N), and Nb(C,N) precipitates were observed in all samples. In addition $Cr_2N$ was observed to be precipitated finely and uniformly by isothermal heat-treatment. The lath width and precipitate size in the isothermal heat-treated samples were much smaller than those of the tempered-only specimens. Because of a fine and uniform precipitate, a reduction of lath width would enhance precipitation hardeing, and it was shown that mechanical propertiesincluding the hardness and tensile properties of the steels were improved by isothermal heat-treatment.
Keywords
sodium-cooled; fast reactor; SFR; fuel cladding; ferritic/matensitic steel; heat-treatment; microstructures; tensile properties;
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