An Auger electron spectroscopy study of phosphorus and molybdenum grain boundary segregation in a 2.25Cr1Mo steel

Journal Article · Sat Mar 15 04:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2007.01.003· OSTI ID:21062203

Wu, J ^[1]; Weng, L -Q ^[1]; Xi, T -H ^[2]; Yuan, Z -X ^[3]

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1. Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Xili, Shenzhen 518055 (China)
2. Technology Centre, Wuhan Iron and Steel (Group) Corporation, Wuhan 430080 (China)
3. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081 (China)

Thermodynamics of grain boundary segregation of phosphorus and molybdenum in a 2.25Cr1Mo steel were investigated using Auger electron spectroscopy (AES). After quenching from 980 deg. C and tempering at 650 deg. C, the steel samples were aged for different times at 560 deg. C, 520 deg. C and 480 deg. C, respectively, followed by AES measurements. Based on the AES results for equilibrium grain boundary concentrations of phosphorus and molybdenum, it is seen that the interaction between these two elements in segregation is weak and the free energies of segregation are constant, being about 38 kJ/mol and 17 kJ/mol for phosphorus and molybdenum, respectively.

• OSTI ID: 21062203
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 3 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUGER ELECTRON SPECTROSCOPY
CHROMIUM ALLOYS
FERRITIC STEELS
FREE ENERGY
GRAIN BOUNDARIES
MOLYBDENUM ALLOYS
PHOSPHORUS ADDITIONS
PRESSURE VESSELS
QUENCHING
SEGREGATION
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TEMPERING
THERMODYNAMICS