Microstructure and mechanical properties of spray formed ultrahigh-carbon steels

QC 20100525 QC 20110914. 2nd International Conference on Spray Deposition and Melt Atomization/5th International Conference on Spray Forming. Univ Bremen, Bremen, GERMANY. JUN 22-25, 2003
The microstructure and mechanical properties of the spray formed 1.25C-3.0Si-1.5Cr ultrahigh-carbon steel (UHCS) were described. The 1.25C-3.0Si-1.5Cr UHCS was processed by spray forming to break up carbide networks. The fine pearlites with average interlamellar spacing of 0.20 mum was observed in the as-sprayed microstructure. The ultimate tensile strength and the pearlite spacing can be related by the Hall-Petch equation. The as-sprayed 1.25C-3.0Si-1.5Cr UHCS consisting of fine lamellar pearlites has been shown to exhibit superplastic behavior at elevated temperature. The dramatic change of microstructure from fine lamellar pearlites to equiaxed grains stabilized by spheroidized particles during superplastic deformation has been observed. The estimation on the basis of thermodynamics shows that the content of chromium of 1.54 wt.% is needed to inhibit graphite formation in the l.25C-3.OSi-1.5Cr UHCS.

In:Materials Science & Engineering: Elsevier BV383:1, s. 45-490921-50931873-4936

By the author/editor: Zhang, J. G.; Lin, Y. J.; Hillert, Mats; Selleby, Malin; Shi, H. S.; Yan, B.; show more...; Zhang, H.; Luo, G. M.; Li, X. J.; Wang, J.; show less...

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