A Model for Particle Dissolution and Precipitation in HSLA Steels

摘要:

文章预览

Precipitation of carbonitrides has been studied in as-cast slabs of one Nb and one Nb and Ti containing HSLA steel. The precipitates have been quantified using LOM and TEM. The measured size and number distributions was then compared to model calculations of precipitate nucleation and growth using estimates of the cooling rates in the austenitic range (1490oC to 800oC) during casting. Both average size and number distributions could be modelled with good agreement using identical model parameters (except for individual diffusion coefficients for the participating species). The model is based on classic nucleation rate theory and a quasistationary approximation for growth of spherical particles. Local equilibrium is assumed at the phase boundary.

信息:

期刊:

编辑:

T. Chandra, K. Tsuzaki, M. Militzer and C. Ravindran

页数:

714-719

引用:

U. Borggren et al., "A Model for Particle Dissolution and Precipitation in HSLA Steels", Advanced Materials Research, Vols. 15-17, pp. 714-719, 2007

上线时间:

February 2006

输出:

价格:

$38.00

[1] G. Engberg, A toolbox for process simulations, Int. conf. Stål 2004, Borlänge, Sweden, 5-6 may (2004).

[2] MATLAB, The MathWorks Inc., (2005).

[3] J-O. Andersson, T. Helander, L. Höglund, P. Shi, B. Sundman: THERMO-CALC & DICTRA, Computational Tool For Materials Science, Calphad (UK), Vol. 26 no. 2 (2002), pp.273-312.

DOI: https://doi.org/10.1016/s0364-5916(02)00037-8

[4] K. Frisk: Private communication. http: /www. mse. kth. se/projects/cct/cct. html.

[5] G. Engberg, M. Hillert, A. Odén: Estimation of the rate of diffusion-controlled growth by means of a quasi-stationary model, Scan. J. Metallurgy, Vol. 4, no. 2, (1975), pp.93-96.

[6] M. Hillert: Teorin för kornförgrovning i en- och tvåfasiga material, Bergshanteringen 2 (1965).

[7] J. Fridberg, L-E. Törndahl and M. Hillert: Diffusion in Iron, Jernkont. Ann. 153 (1969), pp.263-276.

[8] H. Oikawa: Review on Lattice Diffusion of Substitutional Impurities in Iron. A Summary Report, The Technology Reports of the Tohoku University, Vol. 47, no. 2 (1982), pp.215-224.