Grain Boundary Fracture Behavior and Segregation of P under Low Tensile Stresses in Steel 2.25Cr1Mo and 12Cr1MoV

Yu Dong Fu; Qing Fen Li

doi:10.4028/www.scientific.net/KEM.577-578.193

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 577-578Grain Boundary Fracture Behavior and Segregation...

Grain Boundary Fracture Behavior and Segregation of P under Low Tensile Stresses in Steel 2.25Cr1Mo and 12Cr1MoV

Abstract:

Experimental investigation about the grain boundary fracture behavior and segregation behavior of phosphorus under low tensile stresses in steel 2.25Cr1Mo and 12Cr1MoV was carried out in this paper. AES (Auger electron spectroscopy) experiments and dynamic analyses on the non-equilibrium grain-boundary segregation (NGS) of phosphorus and the SEM photos of grain boundary fracture in Auger specimens of both steels were obtained. The variation of phosphorus segregation level in grain boundary at different aging time was studied. Results show that the non-equilibrium segregation of phosphorus occurred at the grain boundaries in the two steels while subjected to a tensile stress of 30MPa and held at 500°C. The corresponding critical time was about 1 hour for steel 2.25Cr1Mo and 3.5hour for steel 12Cr1MoV respectively. SEM photos of grain boundary fracture in Auger specimens of the test steels show that the grain boundary fracture rate increased with increasing concentration of phosphorus, and that the fracture toughness of steel 12Cr1MoV is much lower than the one of steel 2.25Cr1Mo.

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Periodical:

Key Engineering Materials (Volumes 577-578)

Pages:

193-196

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.577-578.193

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Online since:

September 2013

Authors:

Yu Dong Fu, Qing Fen Li

Keywords:

Grain Boundary Fracture Behavior, Low Tensile Stress, Phosphorus, Segregation

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