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By R. Viswanathan

ISBN-10: 1861250797

ISBN-13: 9781861250797

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20. T. Shinoda and R. Tanaka: Bulletin of Japan Inst. Metals, 1972, 11, 180. 21. Y. Sawaragi and K. Yoshikawa: Tetsu to Hagane, 1986, 72, S672. 22. M. Tamura, N. Yamanouchi, M. Tanimura and S. Murase: 1985 Expo. and Symp. , 6-8 Nov. 1985. 23. H. Senba, M. Igarashi and Y. Sawaragi: Proc. Int. Conf. Power Engineering'97, 1997, Vol. 2, 125.

E Q) r- 400 5 10 50100 5001000 5000 Tempering Time (Hrs) Fig. 5% NiCr- Mo- V rotor steel produced to a super clean specification. The same analytical techniques have been used as for Fig. 5 Ni-Cr-Mo-V specification. Schematically the precipitation sequence can be represented as follows: Increasing temperature The initial tempering temperatures used for the heat treatment of low alloy power generation steels are too low to give the precipitation of M23C6 or M6C. However the in-service temperatures which can be looked upon as further low temperature tempering tends to favour the formation of M6C, rather than M23C6• The results obtained also indicate that HP rotors based on Cr-Mo-V steels are likely to follow the M23C6 route to M6C, since their service temperatures THE STRUCTURAL STABILITY OF Low ALLOY STEELS 25 are higher than those of LP rotors.

High Temperature Alloys, Petten, Netherlands, 15-17 June 1985. 9. A. Iseda, Y. Sawaragi, S. Kato and F. Masuyama: 5th Int. Conf. , 18-21 May 1992. 10. K. Yoshikawa, A. Iseda, M. Yano, F. Masuyama, T. Daikoku and H. Haneda: 1st Int. Conf. , 19-21 Nov. 1986. 11. M. Ohgami, Y. Hasegawa, H. Naoi and T. Fujita: IMechE Conf. Trans. 1997-2, Advanced Steam Plant, IMechE, 1997, 115. 12. M. Igarashi and Y. Sawaragi: Proc. Int. Con! Power Engineering - '97, 1997, Vol. 2, 107. 13. F. Masuyama, T. Yokoyama, Y.

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Advanced heat resistant steels for power generation by R. Viswanathan


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