WARM WORKING OF ARMOR PLATE.
Final technical rept.,
MATERIALS RESEARCH LAB INC RICHTON PARK ILL
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Taking advantage of warm working to improve the toughness of armor plate requires that the plates be able to be rolled on present day mills. Calculations indicated that a 50 inch wide steel plate with hardnesses in excess of 400 BHN could not be rolled the required 20 percent in a single pass on existing mills. The plate could be reduced this amount in a multi-pass operation, however. A study of mechanical properties of worked steel showed that armor produced by this technique would be highly anisotropic. Although most studies on strain tempering indicate that the properties of steel are significantly improved by this process, such improvements are not found in the direction of compressive strains. Consequently the processing does not appear promising for armor plate which requires a high level of toughness in all directions. On the other hand, it may be possible to produce dual hardness armor without an interface between the hard and soft layers by means of redundant mechanical working. Author
- Fabrication Metallurgy