Materials Transactions Online

Materials Transactions, Vol.47 No.08 (2006) pp.2106-2108
© 2006 The Japan Institute of Metals

Effect of Rhenium Addition on Tungsten Diffusivity in Iron-Chromium Alloys

Tomonori Kunieda1,, Koji Yamashita1,, Yoshinori Murata1, Toshiyuki Koyama2 and Masahiko Morinaga1

1Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
2National Institute for Materials Science, Tsukuba 305-0047, Japan

The Alloying effect of Re on the diffusivity of W in Fe-15 mol%Cr based alloys was investigated experimentally using the Fe-15Cr/Fe-15Cr-5W and Fe-15Cr-1Re/Fe-15Cr-5W diffusion systems. In these systems, a single ferrite phase existed stably at 1473 K, and Fe and W atoms interdiffused at 1473 K without any attendant changes in the Cr concentration of 15 mol% in them. The measured diffusion length of W atoms was shorter in the Re-containing diffusion system than the Re-free one. Following the binary Boltzmann-Matano method, an apparent interdiffusion coefficient at 1473 K was estimated to be 7.1×10-15 m2/s in the Re-free diffusion system and 1.5×10-15 m2/s in the Re-containing diffusion system. Thus, the presence of Re in the alloy worked to suppress the atomic diffusion of W in a ferrite phase.

(Received 2006/3/28; Accepted 2006/7/3; Published 2006/8/15)

Keywords: Diffusion, heat resistant steel, refractory element, rhenium, tungsten

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