Effect of phosphorus on cleavage fracture in -carbide
نویسندگان
چکیده
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 -carbide, Fe3AlC, a precipitate in the austenitic alloys. We find that phosphorus has higher solubility in Fe3AlC than in -Fe and sharply reduces the cleavage characteristics of -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.
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