Fracture Behaviour and Temper Embrittlement Induced by NGS of Phosphorus

Abstract:

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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

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Price:

$35.00

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