Fracture Behaviour and Temper Embrittlement Induced by NGS of Phosphorus

Abstract:

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.

Info:

Periodical:

Key Engineering Materials (Volumes 324-325)

Edited by:

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

Pages:

33-38

DOI:

10.4028/www.scientific.net/KEM.324-325.33

Citation:

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

Export:

Price:

$35.00

[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.