Advanced Heat Resistant Steels for Power Generation (Matsci) by R. Viswanathan

By R. Viswanathan

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7%V steel, plotted in relation to Hollomon tempering parameter o o ~ :::J C6 CD 0- E Q) I- Fe 0/0 Carbon Fig. 6 Schematic equilibrium diagram to illustrate the change of solubility of carbon in ferrite containing differing amounts of chromium saturation is insufficient to give separate nucleation of the alloy carbide; with high Cr contents the degree of super-saturation increases so allowing Cr7C3 to be separately nucleated within the ferrite. When secondary hardening occurs Ostwald ripening is slowed down.

Hirano: Sumitomo Search, 1992, 48, 50. 16. K. Yoshikawa, H. Fujikawa, H. Teranishi, H. Yuzawa and M. Kubota: Thermal and Nuclear Power (in Japanese), 1985, 36, 1325. 17. Y. Sawaragi, H. Teranishi, H. Makiura, M. Miura and M. Kubota: Sumitomo Kinzoku, 1985, 35, 166. 18. A. Toyama, Y. Minami and T. , 1988, 1, 9. 19. M. Kikuchi, M. Sakakibara, Y. Otaguro, H. Mimura, S. Araki and T. Fujita: Int. Conf. High Temperature Alloys, Petten, Netherlands, 15-17 Oct. 1985. 20. T. Shinoda and R. Tanaka: Bulletin of Japan Inst.

This as M6C forms the ferrite grain grows and the grains may become so large that it becomes difficult to detect the pre-existing austenite grains. ' The segregating species may then lower the interfacial energy and hence influence Ostwald ripening. An alternative view is that the segregating element may trap vacancies at the interface and if the vacancy flux is decreased Ostwald ripening can be slowed down. Whilst there is little evidence to suggest that trace elements have a significant influence on Ostwald ripening of Mo2C, V4C3 or Cr~3 there is some evidence that phosphorus segregates to M6C/a-iron interface and can slow down solute transfer from the ferrite to complex carbide.

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