A Control Method of Grain-Boundary Brittleness by Step Cooling Technique


Article Preview

For most of the experiments and the practical problems about the non-equilibrium grain-boundary segregation (NGS), segregation will always occur during continuous cooling. The effective-time-method assumed that any continuous cooling curve for a sample can be replaced by a corresponding stepped curve. In this paper, the non-equilibrium grain-boundary segregation of phosphorus in step cooling process in an industrial steel12Cr1MoVis studied based on the effective-time-method and compared with that in isothermal holding process. Results show that the calculated result is in good accordance with the experimental observation. It provides a direct support for the effective-time-method of NGS. The step cooling process can speed-up the embrittlement of the steel. Based on the step cooling technique, a control method of grain-boundary brittleness is proposed.



Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz




L. Li et al., "A Control Method of Grain-Boundary Brittleness by Step Cooling Technique", Key Engineering Materials, Vols. 324-325, pp. 39-42, 2006

Online since:

November 2006




[1] T. R. Anthony: Solute segregation in vacancy gradients generated by sintering and temperature changes (Acta Metall, 1969).

DOI: https://doi.org/10.1016/0001-6160(69)90120-5

[2] T. D. Xu: Non-equilibrium Cosegregation to Grain Boundary (Scripta Materialia, 1997).

[3] R.G. Faulkner: Non-equilibrium grain-boundary segregation in austenitic alloys(J. Mater. Sci., 1981).

[4] T. D. Xu: Non-equilibrium Grain-Boundary Segregation Kinetics (J. Mater. Sci., 1987).

[5] T. D. Xu: The Critical Time and Critical Cooling Rate of Non- equilibrium Grain-Boundary Segregation (J. Mater. Sci. Lett., 1988).

[6] T. D. Xu, S. Song: A kinetic nodel of non-equilibrium grain-boundary segregation (Acta Metall., 1989).

[7] S. H. Song, T. D. Xu, Z. X. Yuan: Determination of Critical Time and Critical Cooling Rate of Non-equilibrium Grain-Boundary Segregation (Acta Metall., 1989).

DOI: https://doi.org/10.1016/0001-6160(89)90290-3

[8] Q. F. Li, S. L. Yang, L. Li, L. Zheng and T. D. Xu: Experimental Study on non-equilibrium grain-boundary segregation kinetics of phosphorus in an industrial steel (Scripta Materialia, 2002).

DOI: https://doi.org/10.1016/s1359-6462(02)00151-3

[9] L. E. Davis, N. C. McDonald, P. W. Palmberg, G. E. Riach and R. E. Weber, in: Handbook of Auger electron spectroscopy, 2nd. Minnesota, Phys, Electronics Industries press (1976).