Plasma and Fusion Research

Volume 10, 3405015 (2015)

Regular Articles

Weldability of 9Cr-ODS and JLF-1 Steels for Dissimilar Joining with Hot Isostatic Pressing and Electron Beam Welding

Haiying FU¹⁾, Takuya NAGASAKA^1,2), Takeo MUROGA^1,2), Wenhai GUAN³⁾, Shuhei NOGAMI³⁾, Akira HASEGAWA³⁾ and Hisashi SERIZAWA⁴⁾

1): SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
2): National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
3): Tohoku University, 6-6-01-2 Aramaki-aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
4): Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki 567-0047, Japan

(Received 24 November 2014 / Accepted 23 January 2015 / Published 16 April 2015)

Abstract

Dissimilar joints between 9Cr-ODS and JLF-1 were fabricated by hot isostatic pressing (HIP) and by electron beam welding (EBW), respectively. Compared to the HIP at 1000 °C, HIP at higher temperatures of 1050 °C and 1100 °C is effective to improve the joining strength of the joints. All the as-HIPed joints fractured at the interface during tensile tests. 1050 °C-HIP showed the best joining strength and reduction of area. Post-weld heat treatment (PWHT) with normalization and tempering (N&T) could further improve the joining properties of the HIPed joints. The joints fractured outside the interface at the JLF-1 base metals. EBW showed better weld-ability than HIP, because the joint made by EBW did not fracture at the weld metal during tensile tests, but always fractured at JLF-1 side. However, the properties of the HIPed joints were improved after PWHT with N&T, and were comparable to that made by EBW.

Keywords

hot isostatic pressing, electron beam welding, post-weld heat treatment, joining strength

DOI: 10.1585/pfr.10.3405015

Full Text

PDF format (2.2Mbytes) PDF Download

References

[1] S. Ukai, in Comprehensive Nuclear Materials, edited by R. J. M. Konings (Elsevier, Oxford, 2012), pp.241-271.
[2] T. Tanno, S. Ohtsuka, Y. Yano, T. Kaito, Y. Oba, M. Ohnuma, S. Koyama and K. Tanaka, J. Nucl. Mater. 440, 568 (2013).
[3] Y. Li, T. Nagasaka, T. Muroga, A. Kimura and S. Ukai, Fusion Eng. Des. 86, 2495 (2011).
[4] S. Ukai and M. Fujiwara, J. Nucl. Mater. 307-311, Part 1, 749 (2002).
[5] D.T. Hoelzer, K.A. Unocic, M.A. Sokolov and Z. Feng, J. Nucl. Mater. 442, S529 (2013).
[6] T. Uwaba, S. Ukai, T. Nakai and M. Fujiwara, J. Nucl. Mater. 367-370, Part B, 1213 (2007).
[7] S. Noh, B. Kim, R. Kasada and A. Kimura, J. Nucl. Mater. 426, 208 (2012).
[8] H.Y. Fu, T. Nagasaka, T. Muroga, A. Kimura and J.M. Chen, Fusion Eng. Des. 89, 1658 (2014).
[9] L. Commin, M. Rieth, V. Widak, B. Dafferner, S. Heger, H. Zimmermann, E. Materna-Morris and R. Lindau, J. Nucl. Mater. 442, S552 (2013).
[10] R. Lindau, M. Klimenkov, U. Jäntsch, A. Möslang and L. Commin, J. Nucl. Mater. 416, 22 (2011).
[11] W.D. Callister, Fundamentals of Materials Science and Engineering: An Integrated Approach, 4 edition (Wiley, Hoboken, N.J, 2012).

This paper may be cited as follows:

Haiying FU, Takuya NAGASAKA, Takeo MUROGA, Wenhai GUAN, Shuhei NOGAMI, Akira HASEGAWA and Hisashi SERIZAWA, Plasma Fusion Res. 10, 3405015 (2015).