Fracture Behaviour and Temper Embrittlement Induced by NGS of Phosphorus


Article Preview

The non-equilibrium grain-boundary segregation (NGS) isotherms and its kinetics serve to provide a more complete understanding of inter-granular segregation behavior in relation to mechanical properties, not only for the engineering steels but also for a wide range of structural alloys. The NGS of phosphorus and temper embrittlement dynamics on the same heat treatment condition at the same isothermal holding time in two Cr-Mo steels, 12Cr1MoV and 2.25Cr1Mo, was experimentally studied. The fracture behaviour was also observed by tensile tests in situ in a scanning electron microscope (SEM). Results show that both the concentration of phosphorus atoms in grain boundaries and the degree of embrittlement reaches a maximum at the critical time. It can be satisfactorily elucidated by the temper embrittlement mechanism of NGS caused by cooling from solution temperature to isothermal holding temperature.



Key Engineering Materials (Volumes 324-325)

Edited by:

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






Q. F. Li et al., "Fracture Behaviour and Temper Embrittlement Induced by NGS of Phosphorus", Key Engineering Materials, Vols. 324-325, pp. 33-38, 2006

Online since:

November 2006




[1] D. McLean: Grain-Boundaries in Metals (Oxford University Press, America, 1957).

[2] M. P. Seah: Grain Boundary Segregation and T-t Dependence of Temper Embrittlement (Acta. Metall. 1977).

[3] Xu Tingdong, Song Shenhua: A kinetic model of Non-equilibrium Grain-Boundary Segregation (Acta Metallurgica, 1989).

DOI: 10.1016/0001-6160(89)90048-5

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

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

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

[7] T.D. Xu: Critical time and temper embrittlement isotherms (Materials Science and Technology. 1999).

[8] T. D. Xu, B. Y. Cheng: Kinetics of Non-equilibrium Grain-Boundary Segregation (Prog. Mater. Sci., 2004).

[9] Q. F. Li, L. Li, etc: Temper embrittlement dynamics induced by non-equilibrium segregation of phosphorus in steel 12Cr1MoV (Scripta materialia, 2005).

DOI: 10.1016/j.scriptamat.2005.04.011

[10] Davis L E, McDonald N C, Palmberg P W, Riach G E, Weber R E, in: Handbook of Augerelectron spectroscopy. 2nd ed., Minnesota, Phys. Electronics Industries press (1990).

[11] Briggs D, Seah M P, in: Practical surface analysis, edited by Chapter, 7, Chichester, Wiley Press (1990).

[12] McMahon C J., et al: A Study of Grain Boundries during termpering Embrittlement of a low Carbon Ni-Cr Steel doped with Antimony (Acta Metall. 1976).

DOI: 10.1016/0001-6160(76)90090-0

In order to see related information, you need to Login.