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Replacement of Mo and Nb by W and Ta in modifie reduced activity and improved mechanical properties comprises of the substructural changes and precipi focusses on the effect of W and Ta on microstructura 0.1C steels, with W and Ta concentrations varying fr 1.4 or 2%, was beneficial to retain lath structure a Detailed microstructural investigation of the steesl coarsening of M 23 C 6 carbides than just thermal expo Increase in W was found to be useful to control th precipitate size showed no significant change.

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