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Effect of Isothermal Holding Temperature on NGS Kinetics of Phosphorus and Temper Embrittlement

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Abstract:

When failure occurs in material, it is often occurs by fracture along some grain boundaries and often by the micro-segregation of embrittling impurity to the grain boundaries. In the present work, the non-equilibrium grain-boundary segregation (NGS) kinetics of phosphorus and the temper embrittlement at the same solution treatment and different isothermal holding temperature in steel 2.25Cr1Mo are studied. The NGS kinetics curves of phosphorus at the same solution temperature （1050 oC ）and different isothermal holding temperature (540 oC and 600 oC) are given. Experimental results provide a direct evidence of NGS kinetic model and show that the grain boundary segregation concentrations of phosphorus for specimen isothermal holding at 540 oC are higher than those at 600 oC. The peak values of AES patterns of solute atoms for specimen isothermal holding at 540 oC are also higher than those at 600 oC. It is therefore concluded that the lower the isothermal holding temperature, the higher the segregation concentration of phosphorus at the grain-boundaries, and also the higher the degree of embrittlement.

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Periodical:

Key Engineering Materials (Volumes 348-349)

Pages:

549-552

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.348-349.549

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Online since:

September 2007

Authors:

Jun Wang, Qing Fen Li, Er Bao Liu

Keywords:

Isothermal Holding Temperature, Non-Equilibrium Grain Boundary Segregation, Steel 2.25Cr1Mo, Temper Embrittlement

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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