Thermodynamic Analysis of Boron Nitride Formation in Boron Microalloyed Steel

doi:10.12068/j.issn.1005-3026.2015.04.007

Abstract

Abstract: In aluminum killed boron steel， Ti-B steel and Nb-V-B microalloyed steel， the precipitation relation and the precipitate content of the various precipitates， and the influence of those on the solid solution boron content were thermodynamically analyzed by using the solid solubility formula of alloy elements in austenite. The results showed that the precipitation of BN is prior to the precipitation of AlN， so the effective boron content to increase the stability of austenite decreases in the aluminum killed boron steel. The addition of Ti is an effective method of increasing the solute boron content in the boron steel， because the bonding force between Ti and N is stronger than that between B and N. The contents of Nb and V have little influence on the solute B content in microalloyed steel， but the solute boron content only is related to Ti content added in the steel， and Ti content is 3.4~3.8 times of N content in the Ti-Nb-V-B microalloyed steel at least.

Key words: BN precipitation, microalloyed steel, Ti, precipitation, thermodynamics

CLC Number:

TG142.13

KIM Kwang-su， DU Lin-xiu， GAO Cai-ru. Thermodynamic Analysis of Boron Nitride Formation in Boron Microalloyed Steel[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 483-488.

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