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R. Veerababu R. Balamuralikrishnan K. Muraleedharan M. Srinivas 《Metallurgical and Materials Transactions A》2008,39(7):1486-1495
The evaluation of the tempering response of an ultra-high-strength, high-toughness (UHSHT) steel revealed that samples austenitized
at 900 °C and tempered for 4 and 8 hours at 485 °C had similar yield strengths but a ∼50 pct increase in fracture toughness
for the 8-hour temper. The results of our investigations of microstructural origins of this difference, using the nanometric
scale resolution of the three-dimensional atom probe (3DAP) suggest that nanoscale strengthening precipitates, essentially
carbides and intermetallic clusters (containing primarily Cr and Mo atoms), are present in both samples. The chemical compositions
of the particles in the two samples were found to be similar, but clear evidence of differences in physical attributes of
the precipitates, such as particle size, morphology, and interparticle spacing, are seen.
This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part
of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred December 15–16, 2006 in Mumbai, India.
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| K. Muraleedharan (Scientist)Email: |
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