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Analysis on Surface Crack of Steel Ball(III) ---- Cold processing crack and Crack during operation

Source:Luoyang Mingzhen Bearing Steel Ball Co,. Ltd | Updated: Jul 18, 2016

    In the last article, we have introduced the Quenching crack, here we will introduce the last two kinds of cracks-----Cold processing crack and Crack during operation.
    1.Cold processing crack
    Macroscopic morphology characteristics and location: show linear grinding cracks and the rail crack usually along the rolling direction.
    Microcosmic morphology characteristics: no decarburization on the two sides of the grinding cracks, obvious burn layer on the surface, and decarburization of the rolling cracks.
    Reasons: Grinding cracks are produced mainly because of improper grinding technology or defect on the surface of the parts. Rolling cracks are produces mainly because of improper technic or defect of material such as mixed with oxide and bubbles and so on.
    Ways of analysis: use metallurgical microscope and electron microscope to observe and use hot pickling process to make sure the exact position of the defect of chrome steel balls.
    2.Crack during operation
    Macroscopic morphology characteristics and location: appear in different shapes, mainly in the equatorial part of the chrome steel ball.
    Microcosmic morphology characteristics: no obvious characteristic
    Reasons: mainly because of improper assembly technic or operating conditions does not meet the requirements.
    Ways of analysis: use metallurgical microscope and electron microscope to observe and use hot pickling process to make sure the exact position of the defect of chrome steel balls.


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