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Veerababu, R.; Balamuralikrishnan, R.; Muraleedharan, K.; Srinivas, M. |
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Publication |
Three-dimensional atom probe investigation of microstructural evolution during tempering of an ultra-high-strength high-toughness steel |
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Journal Article |
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2008 |
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Abstract |
Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science |
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Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. |
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39a |
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7 |
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1486-1495 |
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The evaluation of the tempering response of an ultra-high-strength, high-toughness (UHSHT) steel revealed that samples austenitized at 900 degrees C and tempered for 4 and 8 hours at 485 degrees C had similar yield strengths but a similar to 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. |
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Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India, Email: muraleek@hotmail.com |
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English |
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1073-5623 |
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ISI:000256081500004 |
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NU @ m-krug @ |
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10377 |
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