Abstract
In support of work to assess the failure resistance of HT-9, we have investigated the mechanical properties of specimens heat treated to twenty-five combinations of austenitization temperature, Tγ (950–1200°C), tempering temperature (650–780°C), and tempering time (0.5–56 h). Hardness, strength, and dynamic (lower shelf) fracture toughness were found to be relatively insensitive to Tγ. For a given Tγ the strength was found to decrease and the dynamic (lower shelf) fracture toughness was found to increase slightly with increasing tempering time and temperature. Analyses of the data suggest that the critical cleavage fracture stress σf* decreases with increasing Tγ above 1050°C for a number of tempering conditions, and that σf* decreases with increasing tempering temperature and time for a given Tγ.
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