Impurity-induced embrittlement of rotor steels. Volume 1. Temper embrittlement. Final report

Technical Report · Tue Nov 01 04:00:00 EST 1983

OSTI ID:5239068

Zhe, Q; Weng, Y Q; Fu, S C; McMahon, Jr, C J

A systematic study has been made of the effects of the concentrations of Mn, Si, P, and Sn on the temper embrittlement of CrMoV and NiCrMoV steels of controlled hardness and grain size. Results show that the CrMoV steels have relatively low susceptibility to temper embrittlement. Impurities, grain size, and hardness were found to have a pronounced effect on the fracture appearance transition temperature of the steel in the nonembrittled condition. It was found that the embrittlement equation developed for the simple NiCr steels doped with single impurities can be modified and applied usefully to bainitic NiCrMoV rotor-type steels containing Mn, Sn, and P. It was shown that P is the predominant embrittling element in NiCrMoV steels when both P and Sn are present at the 0.02% level and that the presence of 0.3% Mn greatly exacerbates the embrittling effect of phosphorous.

• Research Organization: Pennsylvania Univ., Philadelphia (USA). Dept. of Materials Science and Engineering
• OSTI ID: 5239068
• Report Number(s): EPRI-CS-3248-Vol.1; ON: DE84920109
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
EMBRITTLEMENT
FRACTURE PROPERTIES
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL STEELS
NICKEL-CHROMIUM STEELS
ROTORS
STEELS
TEMPERING
VANADIUM ADDITIONS
VANADIUM ALLOYS