| 摘要 |
A method whereby a composite clad metal ingot can be produced for onward processing at higher temperatures which are sufficient to allow the properties of the substrate material to be adequately controlled to meet specific requirements. These higher temperatures are required to avoid the undue levels of work hardening which occurs at the lower temperatures previously employed because of the need to avoid the formation of deleterious intermetallics at the bonded clad substrate interface. Such intermetallics are formed at temperatures above approximately 850° C. and should they be present, will weaken or destroy the bond. The ingot, consisting of a steel or stainless steel substrate which is clad with a corrosion resistant metal, preferably of titanium, zirconium or their alloys, and containing an interlayer of high melting point metal of tantalum, niobium (columbium) or their alloys, is processed at temperatures above 900° C. The tantalum or niobium interlayer prevents the formation of the deleterious brittle intermetallics which would otherwise be formed at these temperatures. Consequently, these higher temperatures can be used to control the steel properties by the conventional and prescribed methods of the art and without regard to the effects that they would otherwise have upon the bond.
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