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  1. jonnynoface

    Oxide formation rate on iron/nickel/cobalt material

    How important is the cooling rate when oxidizing Kovar material? The process sets the temperature, so our only manageables are oxygen availability, time at temperature, & cooling rate. Does the cooling rate affect the quantity and quality of the oxide layer? Just one or the other? Or neither?
  2. jonnynoface

    R188 material

    I have come across a steel designation from a German auto supplier that I can't find in the rather dated ASM books I have. It is listed as R188. They are bars about the size that would be used for shafts or pinions. I'm use to working with AISI designations. Can anyone please steer me in the...
  3. jonnynoface

    spherodization assessment of carbon steels

    I've been in heat treating for 23 years and have never been able to find a chart similar to a grain size chart to assess the degree of spherodization acheived in carbon steels. Can anyone steer me in that direction or offer a practical guide? For example, do long, rounded carbides count as...
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