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X-Ray Study on the Fatigue Fracture Surface of Austempered Ductile Cast Iron

Published online by Cambridge University Press:  06 March 2019

Yoichi Kishi ,
Yukio Hirose ,
Zenjiro Yajima  and
Keisuke Tanaka
Yoichi Kishi
Affiliation:
Department of Materials Science, Kanazawa University 1-1 Marunouchi, Kanazawa 920, Japan
Yukio Hirose
Affiliation:
Department of Materials Science, Kanazawa University 1-1 Marunouchi, Kanazawa 920, Japan
Zenjiro Yajima
Affiliation:
Department of Mechanical Engineering, Kanazawa Institute of Technology, 7-1 Gogigaoka, Nonoichi, Kanazawa 921, Japan
Keisuke Tanaka
Affiliation:
Department of Mechanical Engineering, Nagoya University Furoh-cho, Chigusa-ltu, Nagoya 464-01, Japan
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Extract

Austempered ductile cast iron (ADI) lias microstructures that consist of martensite and of retained austenite. ADI has very toughness compared with cast iron heat-treated differently. The retained austenite near fracture surfaces transforms to martensite when fracture occurs.

In the present study, X-ray fraetography is applied to fatigue fracture surfaces of ADI. The fatigue tests were carried out on compact tension (CT) specimens. The volume fraction of retained austenite was measured quantitatively and the line broadening of X-ray diffraction profiles was measured on and beneath fatigue fracture surfaces. The depth of the plastic zone left on fracture surfaces was evaluated from line broadening. The results are discussed on the basis of fracture mechanics.

Type
VII. Stress Determination by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 35 , Issue A: First Pacific-International Congress on X-ray Analytical Methods (PICXAM). Fortieth Annual Conference on Applications of X-ray Analysis, August 7-16, 1991 , 1991 , pp. 503 - 510
Copyright
Copyright © International Centre for Diffraction Data 1991

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References

1. Kikukawa, M., Jono, M., Tanaka, K., and Takatani, M.,“Measurement of Fatigue Crack Propagation and Crack Closure at Low Stress Intensity Level by Unloading Elastic Compliance Method,” Journal of The Society of Materials Science Japan, 25:899 (1976).Google Scholar
2. Yajima, Z., Hirose, Y., Kishi, Y., and Tanaka, K., “X-Ray Residual Stress Measurement of Ground Surface of Metal-Ceramic Composite,”Advances in X-Ray Analysis, 34:679 (1991).Google Scholar
3. Hirose, Y., Yajima, Z., and Tanaka, K., “X-ray Fractographie Approach to Brittle Fracture of Ceramics and Ceramic Composite,” To be published in Current Japanese Materials Research Vol.10. The Society of Material Science Japan, (1991).Google Scholar