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  • 1.  Irregular layer at surface of Q+T steel

    Posted 16 days ago

    I am reviewing parts that were heat treated by a new heat treat vendor. I am seeing a thin (generally less than 0.001"), irregular layer on the surface of many of the parts. The layer appears to contain porosity and oxide particles. I have attached some images showing the surface layer. I am wondering if anyone has an idea as to what could cause this? Could it be a scale layer that was partially deoxidized in the heat treat atmosphere?



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    Kenneth Kirby
    Senior Project Engineer
    Snap-on, Inc.
    Kenosha WI
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  • 2.  RE: Irregular layer at surface of Q+T steel

    Posted 15 days ago

    Hello Kenneth,

     

    Was the heat treat conducted in air with no protective atmosphere? If it was under atmosphere, check for possible air leaks inside the furnace. It could indeed be scale flakes peeling off from the contact with air (oxygen) during the heat treat.

     

    Best,

    George Baloi
    Chief Metallurgist

    ALD Thermal Treatment Inc.
    2656 24th Street
    Port Huron, MI 48060 USA

    Tel: (810) 357-0692   |    Fax: (810) 357-0699   |    Mobile: (810) 363-4830   |    gbaloi@aldtt.net

     






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