Evaluation of the Fatigue Damage of Rolls for Strip Mills below the Surface by X-ray Diffraction Method

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  • X線回折による圧延ロールの表面疲労損傷度評価
  • Xセン カイセツ ニヨル アツエン ロール ノ ヒョウメン ヒロウ ソンショウ

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Abstract

Technique of the X-ray diffraction line profile analysis has been applied to the study of fatigue damage below the surface of the work and the backup rolls of cold strip mill and the backup rolls of hot strip mill. Half value breadth has been taken as a measure of fatiguing.<BR>Fatigued zone below the surface of rolls is well correlated with the half contact length of roll, L; 0.03 L in the work roll of cold strip mill and 0.1 L in the other rolls. Changes in the half value breadth with increase in cycles of roll contact differ in accordance with the surface hardness of the rolls: continued cycling results in decrease of the half value breadth at surface in hard rolls (Hs≥60) and increase in soft rolls (Hs≤50). The technique of X-ray study of fatigue can be extended to prediction and prevention of accidental failure of rolls due to fatigue fracture such as spalling. Furthermore the amount of surface dressing at regular maintenance of rolls can be saved significantly on the basis of accurate evaluation of the depth of fatigue damaged zone.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 65 (14), 2067-2075, 1979

    The Iron and Steel Institute of Japan

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