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

Quantitative Analysis of Retained Austenite by X-Ray Method

Published online by Cambridge University Press:  06 March 2019

Akira Suzuki ,
Yoichi Kishi ,
Zenjiro Yajima  and
Yukio Hirose
Akira Suzuki
Affiliation:
Dept. of Engineering Science, Nippon Institute of Technology4 - 1 Miyashiro-machi, Minami-saitama-gun 345, Japan
Yoichi Kishi
Affiliation:
Dept. of Engineering Science, Nippon Institute of Technology4 - 1 Miyashiro-machi, Minami-saitama-gun 345, Japan
Zenjiro Yajima
Affiliation:
Dept. of Mechanical Engineering, Kanazawa Institute of Technology7-1 Oogigaoka, Nonoichi, Kanazawa 921, Japan
Yukio Hirose
Affiliation:
Dept. of Materials Science, Kanazawa University Kakuma-machi, Kanazawa 920-11, Japan
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Extract

Austempered ductile cast iron (ADI) has composite microstructures, which are martensite/retained austenite structures. ADI has very large toughness compared to other ductile cast irons. After fracture, the retained austenite near the fracture surface will be transformed to martensite. In the present study, X-ray fractography is applied to fatigue fracture surface of ADI. The fatigue tests were carried out on compact tension (CT) specimens. The volume fraction of retained austenite was quantitatively measured on and beneath fatigue fracture surfaces. The plastic strain on the fracture surface was estimated from measuring the line broadening of X-ray diffraction profiles. The depth of the plastic zone left on fracture surface was evaluated from the distributions of the volume fraction of retained austenite. The results are discussed on the basis of fracture mechanics.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 37: Forty-Second Annual Conference on Applications of X-ray Analysis, August 2-6, 1993 , 1993 , pp. 327 - 334
Copyright
Copyright © International Centre for Diffraction Data 1993

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References

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