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Influence of surface hardening by laser irradiation on the loss factor of cast iron

Published online by Cambridge University Press:  31 January 2011

Hiromasa Adachi ,
Yoshihiko Masuo  and
Teruo Hasegawa
Hiromasa Adachi
Affiliation:
Nagoya Municipal Industrial Research Institute, 3–4-41 Rokuban, Atsuta-ku, Nagoya 456, Japan
Yoshihiko Masuo
Affiliation:
Nagoya Municipal Industrial Research Institute, 3–4-41 Rokuban, Atsuta-ku, Nagoya 456, Japan
Teruo Hasegawa
Affiliation:
Nagoya Municipal Industrial Research Institute, 3–4-41 Rokuban, Atsuta-ku, Nagoya 456, Japan
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Abstract

Surface hardening by laser irradiation was examined regarding the loss factor, which is the parameter of the vibration-damping characteristics, for flake graphite cast irons and spherical graphite cast irons. The surface of the samples was quenched by changing speed of beam, gas pressure, and beam frequency. It was found that the depth of the hardening region was from 0.12 mm to 1.11 mm, and the hardness of the boundary between the hardening and the nonhardening regions changed suddenly. It was confirmed that the loss factor of the laser hardened specimens increased considerably as compared with that of the as-cast specimens. The internal friction at the vicinity of the boundary between the hardening and the nonhardening regions may be responsible for this result.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1656 - 1659
Copyright
Copyright © Materials Research Society 1998

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References

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