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X-Ray Fractography Evaluation of the Plastic Zones of Dynamic Fracture

Published online by Cambridge University Press:  06 March 2019

Kazuyuki Matsui ,
Osamu Nakada ,
Yukio Hirose  and
Keisuke Tanaka
Kazuyuki Matsui
Affiliation:
Ishikawa Seisakusho, LTD Minamimorimoto, Kanazawa 920-01, Japan
Osamu Nakada
Affiliation:
Ishikawa Seisakusho, LTD Minamimorimoto, Kanazawa 920-01, Japan
Yukio Hirose
Affiliation:
Department of Material Science, Kanazawa University Marunouchi, Kanazawa 920, Japan
Keisuke Tanaka
Affiliation:
Department of Engineering Science, Nagoya University Furo-cho, Chikusa-ku, Nagoya, Japan
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Abstract

To evaluate the plastic zones of dynamic fracture, instrumented Charpy impact tests of high carbon bearing steels are conducted. The amount of plastic zone size left on the fracture surface is evaluated from the X-ray diffraction profiles. An analysis is presented of the relationship between the X-ray diffraction profiles and fracture mechanics parameters. The results are discussed in correlations between dynamic stress intensity factor and absorbed energy values. A good correlation exists between the plastic zone size and the dynamic stress intensity factor.

The fraction of retained austenite is determined from X-ray diffraction profiles at surfaces of fractures and also beneath the surfaces of fractures.

It shows the work hardening is introduced by the strain energy in the plastic zones. The values of the proportionality constant, α, determined for various kinds of dynamic fracture are related to half-value breadth by the function

where B0 and BF are average of half-value breadth which are given by core of material and plastic zone of dynamic fracture.

Type
IX. Stress and Strain Determination by Diffraction Methods, Peak Broadening Analysis
Information
Advances in X-Ray Analysis , Volume 36: Forty-First Annual Conference on Applications of X-ray Analysis, August 3-7, 1992 , 1992 , pp. 551 - 560
Copyright
Copyright © International Centre for Diffraction Data 1992

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References

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