The Application of Colmonoy Number 1 and Dymonhard Number 65 by the Surface Hardening of Armor Plate,
WATERTOWN ARSENAL MA
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Colmonoy No.1 and Dymonhard No.65 are not recommended for surface hardening of cast or rolled armor since 1 Both of these materials contain relatively high alloy context some of which are classed as strategc 2 The resulting hard surfaces are either porous or contain many incipient cracks. 3 The ballistic properties of the surface hardened plates were not sufficiently promising to warrant further investigation 4 Both materials are difficult to apply to armor--The application of Colmonoy to 14-in and 38-in, thick rolled homogeneous armor drew the temper to such a degree that it was necessary to reheat these plates 5 Both materials when applied to lighter gauges caused some warping of the plate Although the price of Colomonoy per pound compares favorably with that of stainless steel electrodes, Dymonhard is further undesirable from the cost standpoint nearly 3.00 per pound. The application of Dymonhard to the surface hardening of stainless ateel welds or armor has not proven successful.
- Metallurgy and Metallography