Effect of Boron on Microstructure and Impact Toughness of a 10%Cr Martensitic Steel

Nadezhda Dudova; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.706-709.847

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Boron on Microstructure and Impact...

Effect of Boron on Microstructure and Impact Toughness of a 10%Cr Martensitic Steel

Abstract:

It was shown that in a 10% Cr martensitic steel enriched by boron this element tends to segregate within M₂₃C₆ carbides having the film-like shape and precipitated on the boundaries of prior austenite grains (PAG), mainly. It leads to a low value of Charpy V-notch impact toughness of 6 J/cm². These carbides are highly resistant against the spheroidizing. Only the tempering at 770°C leads to the final formation of M₂₃C₆ carbides having the equiaxed shape. Concurrently, this tempering strongly decreases boron segregation. As a result, the 10% Cr martensitic steel exhibits a high value of Charpy V-notch impact toughness of 260 J/cm².

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Materials Science Forum (Volumes 706-709)

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847-852

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.847

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Online since:

January 2012

Authors:

Nadezhda Dudova, Rustam Kaibyshev

Keywords:

Boron Segregation, Ductile-to-Brittle Transition, High-Chromium Martensitic Steel, Impact Toughness, Microstructure

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