Surface modification of Cr{sub 12} MoV steel by PSII nitrogen implantation

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:323601

Pu, W ^[1]

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1. Southwestern Inst. of Physics, Chengdu, Sichuan (China)

The PSII nitrogen implantation for Cr{sub 12} MoV steel modification is performed in the PSII-IM facility. The implantation is carried out at different implantation doses but keep the same other conditions. After implantation the samples are analyzed by using Micro-Hardness Tester, Ball-on-disc Multifunctional Tribometer. X-ray Diffraction Spectrometer and XPS. The results show that after PSII nitrogen implantation, the surface mechanical properties are improved greatly. The X-ray analysis demonstrates that in the Cr{sub 12} MoV steel, PSII implantation results hard carbide Fe{sub 7}Ce{sub 3} and Cr{sub 7}C{sub 3} growth because of high concentration of carbon and fast diffusion speed at elevated temperature implantation. The XPS analysis shows that from the surface to the deep layer, the binding energy of N atoms shift from high energy to low energy. The high energetic ion bombardment, thermal diffusion, fined hard carbide growth and formation of new phase during nitrogen implantation are the main reasons to improve the surface mechanical properties of Cr{sub 12}MoV steel at elevated temperature.

• OSTI ID: 323601
• Report Number(s): CONF-970559--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ION IMPLANTATION
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITROGEN IONS
PHYSICAL RADIATION EFFECTS
STEEL-CR12MOV
SURFACE TREATMENTS