Suppression of Type IV fracture and improvement of creep strength of 9Cr steel welded joints by boron addition

International Journal of Pressure Vessels and Piping

Volumn 84, Issue 1-2, 2007, Pages 44-52

  Abe, Fujio ^a   Tabuchi, Masaaki ^a   Kondo, Masayuki ^a   Tsukamoto, Susumu ^a  

^a NATIONAL INSTITUTE FOR MATERIALS SCIENCE   (Japan)

Author keywords

9Cr steel; Boron; Creep; Heat affected zone; Martensitic microstructure; Type IV fracture; Welded joint

Indexed keywords

BORON; BRITTLE FRACTURE; COMPOSITION EFFECTS; CREEP; CRYSTAL MICROSTRUCTURE; HEAT AFFECTED ZONE; MARTENSITE; WELDS;

CREEP STRENGTH; MARTENSITIC MICROSTRUCTURE; WELDED JOINTS;

STEEL;

BORON; BRITTLE FRACTURE; COMPOSITION EFFECTS; CREEP; CRYSTAL MICROSTRUCTURE; HEAT AFFECTED ZONE; MARTENSITE; STEEL; WELDS;

EID: 33846290355     PISSN: 03080161     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.ijpvp.2006.09.013     Document Type: Article

References (24)

1. Blum R, Vanstone RW. Materials development for boilers and steam turbines operating at 700 °C. In: Proceedings of the sixth international charles Parsons turbine conference, Dublin, Ireland; 16-18 September 2003. p. 489-510.
2. Viswanathan R, Henry J F, Tanzosh J, Stanko G, Shingledecker J, Vitalis B. US program on materials technology for USC power plants. In: Proceedings of the fourth international conference on advances in materials technology for fossil power plants, Hilton Head Island, South Carolina, USA, 25-28 October 2004. p. 3-19.
3. Abe F, Okada H, Wanikawa S, Tabuchi M, Itagaki T, Kimura K, Yamaguchi K, Igarashi M. Guiding principles for development of advanced ferritic steels for 650 °C USC Boilers. In: Proceedings of the seventh Liege conference on materials for advanced power engineering 2002, Liege, Belgium; 30 September-2 October 2002. p. 1397-406.
4. Abe F, Horiuchi T, Taneike M, Sawada K. Improvement of creep strength by boron and nano-size nitrides for tempered-martensitic 9Cr-3W-3Co-VNb steel at 650 °C. In: Proceedings of the sixth international Charles Parsons turbine conference, Dublin, Ireland; 16-18 September 2003. p. 379-96.
5. Abe F., and Tabuchi M. Microstructural and creep strength of welds in advanced ferritic power plant steels. Mater Sci Technol Welding Joining 9 (2004) 22-30
6. Letofsky E., and Cerjak H. Metallography of 9Cr steel power plant weld microstructures. Mater Sci Technol Welding Joining 9 (2004) 31-36
7. Hasegawa Y., Ohgami M., and Okamura Y. Creep properties of heat affected zone of weld in W containing 9-12% chromium creep resistant martensitic steels at elevated temperature. Advanced heat resistant steels for power generation (1999), IOM Communications, The University Press, Cambridge p. 655-67
8. Tabuchi M., Watanabe T., Kubo K., Matsui M., Kinugawa J., and Abe F. Microstructure and creep strength of welded joints for W strengthened high Cr ferritic steel. J Soc Mater Sci Japan 50 (2001) 116-121 [in Japanese]
9. Tabuchi M., Watanabe T., Kubo K., Matsui M., Kinugawa J., and Abe F. Creep crack growth behavior in the HAZ of weldments of W containing high Cr steel. Int J Pressure Vessels Piping 78 (2001) 779-784
10. Matsui M., Tabuchi M., Watanabe T., Kubo K., Kinugawa J., and Abe F. Degradation of creep strength in welded joints of 9-12%Cr steels. ISIJ Int 41 (2001) S126-S130
11. Tabuchi M., Matsui M., Watanabe T., Hongo H., Kubo K., and Abe F. Creep fracture analysis of W strengthened high Cr steel weldment. Mater Sci Res Int 9 (2003) 23-28
12. Watanabe T., Yamazaki M., Hongo H., Tabuchi M., and Tanabe T. Effect of stress on microstructural change due to aging at 823 K in multi-layer welded joint of 2.25Cr-1Mo steel. Int J Pressure Vessels Piping 81 (2004) 279-284
13. Watanabe T. Relationship between Type IV fracture and microstructure on 9Cr-1Mo-V-Nb steel welded Joint creep-ruptured after long term. Tetsu-to-Hagane 90 (2004) 206-212 [in Japanese]
14. Kushima H, Kimura K, Abe F. Long-term creep strength prediction of high Cr ferritic creep resistant steels. In: Proceedings of the seventh Liege conference on materials for advanced power engineering 2002, Liege, Belgium; 30 September-2 October 2002. p. 1581-90.
15. Ogata T., and Yaguchi M. High-temperature strength property evaluation of heat affected zone in boiler weldment parts of 2.25Cr-1Mo steel. J Soc Mater Sci Japan 47 (1998) 253-259
16. Yagi K., Tabuchi M., Kubo K., Kim J.J., and Huh Y.H. The influence of fracture mechanisms on the creep crack growth behavior of 316 stainless steel. Eng Fract Mech 57 (1997) 463-473
17. Sakuraya T., Okada H., and Abe F. BN type inclusions formed in high Cr ferritic heat resistant steel. Tetsu-to-Hagane 90 (2004) 819-826 [in Japanese]
18. Albert S K., Kondo M., Tabuchi M., Yin F., Sawada K., and Abe F. Improving the creep properties of 9Cr-3W-3Co-NbV steels and their weld joints by the addition of boron. Metall Mater Trans A 36A (2005) 333-343
19. Tabuchi M., Kondo M., Watanabe T., Hongo H., Yin F., and Abe F. Improvement of Type IV cracking resistance of 9Cr heat resisting steel weldment by boron addition. Acta Metall Sin 17 (2004) 331-337
20. Kimmins S.T., and Gooch D.J. Austenite memory effect in 1Cr-1Mo-0.75V(Ti,B) steel. Met Sci 17 (1983) 519-532
21. Shiue R.K., Lan K.C., and Chen C. Toughness and austenite stability of modified 9Cr-1Mo welds after tempering. Mater Sci Eng A287 (2000) 10-16
22. Maki T., Morimoto H., and Tamura I. Recrystallization of the austenite transformed reversely and structure of martensite in 18Ni maraging steel. Tetsu-to-Hagane 65 (1979) 1598-1606 [in Japanese]
23. Horiuchi T., Igarashi M., and Abe F. Improved utilization of added B in 9Cr heat-resistant steels containing W. ISIJ Int 42 (2002) S67-S71
24. Abe F., Horiuchi T., and Sawada K. High-temperature annealing for maximization of dissolved boron in creep-resistant martensitic 9Cr steel. Mater Sci Forum 426 (2003) 1393-1398