Effect of Phosphorus on Cleavage Fracture in Κ-Carbide

Author

N. I. Medvedeva
Ryan A. Howell
David C. Van Aken, Missouri University of Science and TechnologyFollow
Julia E. Medvedeva, Missouri University of Science and TechnologyFollow

Abstract

To understand the origin of cleavage fracture which dominates in Fe(Mn)-Al-C alloys at a high phosphorus concentration, we performed first-principles study of the phosphorus effect on ideal cleavage energy and critical stress in κ-carbide, Fe₃ AlC, a precipitate in the austenitic alloys. We find that phosphorus has higher solubility in Fe₃ AlC than in γ-Fe and sharply reduces the cleavage characteristics of κ-carbide. We show that strong anisotropy of the Fe-P bonds in Fe₃ (Al,P) C under tensile stress, leads to the appearance of large structural voids and may facilitate crack nucleation.

Recommended Citation

N. I. Medvedeva et al., "Effect of Phosphorus on Cleavage Fracture in Κ-Carbide," Physical Review B - Condensed Matter and Materials Physics, vol. 81, no. 1, American Physical Society (APS), Jan 2010.

The definitive version is available at https://doi.org/10.1103/PhysRevB.81.012105

Department(s)

Materials Science and Engineering

Second Department

Physics

International Standard Serial Number (ISSN)

1098-0121; 1550-235X

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2010 American Physical Society (APS), All rights reserved.

Publication Date

01 Jan 2010