The use of metallic intermediate layers between base material and CRA in the production of hot rolled clad plates has the purpose of preventing the formation of undesirable intermetallic phases or the diffusion of critical elements such as carbon from the base material into the CRA. The present work shows different methods of avoiding or suppressing the carbon diffusion into the CRA. Carbon distribution in the bonding area can be influenced by three independent measures, which might be combined: 1. Choosing a low carbon base-material 2. Choosing the production route TM+ACC (thermomechanically rolled and accelerated cooled), which enables suppressing carbon diffusion 3. Using Nickel-intermediate layers of different types (thermally sprayed or solid sheets) and thicknesses. It can be summarized that TM+ACC without Nickel-layer results in the same Carbon-Distribution in the vicinity of the bonding area as a clad-plate produced by common rolling procedure followed by quenching and tempering (DR+QT, abbr. see later) applying a 0,15-mm-Nickel-intermediate-layer. The use of low carbon base materials greatly reduces the area in the CRA affected by carbon diffusion. A disadvantage of intermediate layers is that they lower the share strength.
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