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U.S. Department of Energy
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Effects of austenitizing and tempering heat treatments on the impact energy of alloy HT-9. [LMFBR]

Technical Report ·
OSTI ID:6138550
Based on the data acquired in this study, the effects of austenitizing and tempering heat treatments on the impact energy of HT-9 can not be completely known or understood. The Charpy-impact transition temperature (ITT) was depressed 38/sup 0/C by decreasing the austenitizing temperature from 1000/sup 0/C to 900/sup 0/C. However a decrease from 1100/sup 0/C to 1050/sup 0/C produces an increase in the ITT of 40/sup 0/C. The lowest ITT was found to occur at -10/sup 0/C. This condition was produced by an austenitization at 1100/sup 0/C. An inverse relationship between grain size and ITT was found to exist in the range of grain sizes from 4 to 8. At a grain size of 3, the ITT was found to be -10/sup 0/C and the inverse relationship is invalid. Further research is needed in the range of larger grain sizes.
Research Organization:
Auburn Univ., AL (USA). Dept. of Mechanical Engineering
DOE Contract Number:
AS05-82NE37900
OSTI ID:
6138550
Report Number(s):
DOE/NE/37900-1; ON: DE83015652
Country of Publication:
United States
Language:
English