Microstructure and mechanical properties of a 3Cr-1.5Mo steel |
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Authors: | R L Klueh A M Nasreldin |
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Affiliation: | (1) Metals and Ceramics Division, Oak Ridge National Laboratory, 37831-6376 Oak Ridge, TN;(2) Metallurgy Department, Nuclear Research Center, Atomic Energy Establishment, Cairo, Egypt |
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Abstract: | Tensile and impact properties were determined for a steel (3 wt pct Cr-1.5 wt pct Mo-0.1 wt pct V-0.1 wt pct C) considered
a candidate for elevated-temperature pressure-vessel applications. The steel was tested in two heat-treated conditions: normalized
and tempered and quenched and tempered for various tempering conditions. Similar tempering treatments for the quenched and
the normalized steels led to similar strengths. However, for the lowest tempering parameter used, the impact properties for
the quenched-and-tempered steel exceeded those for the normalized-and-tempered steel, resulting in an excellent ductile-brittle
transition temperature (-70 °C) and upper-shelf energy (225 J) for the quenched-and-tempered steel at a high strength (770
MPa ultimate tensile strength). Further tempering reduced the strength for the steel in both heat-treated conditions. The
impact properties of the quenched steel were only slightly changed by further tempering, but those for the normalized steel
improved, eventually equaling those for the quenched-and-tempered steel. The difference in impact properties after the two
heat treatments was attributed to a difference in bainite microstructures. |
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