I don’t know enough about this to judge but, I believe you are talking about “Case Hardening” or “Surface Hardening” the McGill, Hill, series of forestry and wood product books covers this a little but I thing they are out of print.
I don’t know enough about this to judge but, I believe you are talking about “Case Hardening” or “Surface Hardening” the McGill, Hill, series of forestry and wood product books covers this a little but I thing they are out of print.