Precipitation Behavior of MN(M=V,Nb) Phase in the 7Cr-1.5Mo Ferritic Heat Resistant Steels


Article Preview

The relationship between precipitation behavior of MX(M=V, Nb) nitrides and mechanical property during aging in 7Cr-1.5Mo ferritic heat resistant steels were investigated in this study. Artificial aging was carried out at 700°C for different time from 100 to 10000 hours to simulate the environment of fossil power plant. The Ostwald ripening equation is related to the containing elements can explain the accelerated coarsening of MX in the model alloys. The Ostwald ripening equation was modified by introducing the effective diffusion coefficient as a sum of the lattice diffusion coefficient and dislocation diffusion coefficient, based on an assumption that V, Nb and Ti might diffuse not only by the lattice diffusion mechanism but also by the dislocation diffusion mechanism.



Advanced Materials Research (Volumes 26-28)

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




D. S. Bae and W. S. Jung, "Precipitation Behavior of MN(M=V,Nb) Phase in the 7Cr-1.5Mo Ferritic Heat Resistant Steels", Advanced Materials Research, Vols. 26-28, pp. 1093-1096, 2007

Online since:

October 2007




[1] K. Sawada, K. Kubo and F. Abe, Material Science Engineering, A319, 784 (2001).

[2] T. Kikuchi, Report of 123rd Committee on Heat Resisting Metals and Alloys, JSPS 39, 255 (1998).

[3] R. B. Scarlin, Advances in Turbine Materials, Design and Manufacturing, Inst. Mater., London, 242 (1997).

[4] H. Kaneko, et al, J. JIM, Vol. 30, (1996), p.263.

[5] N. Takahashi and T. Fugita, Trans. ISIJ, Vol. 16, (1976), pp.606-613.

[6] Masaki Taneike, Fujio Abe and Kota Sawada, Nature, (2003), Vol. 424, pp.294-295.

[7] W. Ostwald: Analytische Chemie, 3rd ed., Engelman, Leipzig, 1901, p.23.

[8] I. M. Lifshitz and V. V. Slyozov: J. Phys. Chem. Solids. 19 (1961), 35.

[9] C. Wagner: Z. Electrochem, 65 (1961), 581.

Fetching data from Crossref.
This may take some time to load.