Comments on the grain boundary segregation and diffusion of phosphorus in 12% CrMoV-steel

Journal Article · Sat May 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90007-F· OSTI ID:6613253

Militzer, M ^[1]; Wieting, J ^[2]

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1. McGill Univ., Montreal, Quebec (Canada)
2. Inst. fuer Festkoerper- und Werkstofforschung, Dresden (Germany)

Recently, Mackenbrock and Grabke published new results of Auger electron spectroscopy (AES) studies of the grain boundary segregation kinetics in a 12% CrMoV-steel doped with 0.057 wt% P. An interpretation of the phosphorus segregation behavior at intercrystalline fracture surfaces reveals an enrichment mechanism which is not bulk diffusion controlled as conventionally assumed. Thus, in order to maintain a description within the conventional McLean theory, Mackenbrock and Grabke suggested an enhanced bulk diffusivity of P due to fast diffusion paths along sub-boundaries and dislocation networks. On the other hand, Militzer and Wieting analyzed the kinetics of segregation induced temper embrittlement more generally and concluded that below 600 C the observed phosphorus segregation results from a demixing process within the grain boundary itself. Consequently, grain boundary diffusion instead of bulk diffusion is rate controlling and a model describing this type of enrichment kinetics was developed. In the present paper, the experimental results of Mackenbrock and Grabke are interpreted in the framework of this new model.

• OSTI ID: 6613253
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 28:9; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM STEELS
ATOM TRANSPORT
GRAIN BOUNDARIES
PHOSPHORUS
DIFFUSION
COMPARATIVE EVALUATIONS
EMBRITTLEMENT
MATHEMATICAL MODELS
MOLYBDENUM ADDITIONS
SEGREGATION
VANADIUM ADDITIONS
ALLOYS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
EVALUATION
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
RADIATION TRANSPORT
STAINLESS STEELS
STEELS
VANADIUM ALLOYS
360104* - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies