Modelling and characterization of chi-phase grain boundary precipitation during aging of Fe-Cr-Ni-Mo stainless steel

Xu, W. and San Martin, D. and Rivera Díaz del Castillo, P. E.J. and van der Zwaag, S. (2007) Modelling and characterization of chi-phase grain boundary precipitation during aging of Fe-Cr-Ni-Mo stainless steel. Materials Science and Engineering: A, 467 (1-2). pp. 24-32. ISSN 0921-5093

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Abstract

High molybdenum stainless steels may contain the chi-phase precipitate (χ, Fe36Cr12Mo10) which may lead to undesirable effects on strength, toughness and corrosion resistance. In the present work, specimens of a 12Cr-9Ni-4Mo wt% steel are heat treated at different temperatures and times, and the average particle size and particle size distribution of chi-phase precipitate are studied quantitatively. A computer model based on the KWN framework has been developed to describe the evolution of chi-phase precipitation. The kinetic model takes advantage of the KWN model to describe the precipitate particle size distribution, and is coupled with the thermodynamic software ThermoCalc® for calculating the instantaneous local thermodynamic equilibrium condition at the interface and the driving force for nucleation. A modified version of Zener's theory accounting for capillarity effects at early growth stages is implemented in this model. The prediction of the model for chi-phase precipitation at a grain boundary is compared to experimental results and both the average particle size and the particle size distribution are found to be in good agreement with experimental observations at late precipitation stages.

Item Type:
Journal Article
Journal or Publication Title:
Materials Science and Engineering: A
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
ID Code:
125485
Deposited By:
Deposited On:
24 May 2018 13:44
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Jun 2020 06:44