Cutting edge

Well, that s the end of Strike s section on MD-P2P/P2P synthesis. But that s not all this book has on the subject. For the goods on advanced, cutting-edge recipes, including more P2P synths, just go and check out Rhodium s Chapter. You won t regret it ... 

The resistance to corrosion of some alloy sheet is improved by cladding the sheet with a thin layer of aluminum or aluminum alloy that is anodic to the base alloy. These anodic layers are typically 5—10% of the sheet thickness. Under corrosive conditions, the cladding provides electrochemical protection to the core at cut edges, abrasions, and fastener holes by corroding preferentially. Aircraft skin sheet is an example of such a clad product. 

Fig. 4. Offset arrangement of sheer knives where (a) shows the first cutting edge, and (b), the second.

It maybe economical, therefore, to use these materials at or near the cutting edge instead of as the whole insert. The development of tools of TiC (40—55%) or TiN (30—60%) in a steel matrix on a steel core using powder metallurgy technology suggests a similar approach for cemented carbides as the need arises. 

STRATEGY AND PROGRAM TOWARD DEVELOPING CUTTING-EDGE ANALYTICAL INSTRUMENTS AND DEVICES A NEW INITIATIVE BY JAPANESE GOVERNMENT... 

Boyce, M.P., Cutting Edge Turbine Technology, Middle East Eleetrieity, August 1999. 

These steels resist oxidation scaling up to 825°C but are difficult to weld and, thus, are used mainly for items that do not involve welded joints [17]. They are thermally hardened and useful for items that require cutting edges and abrasion resistance in mildly corrosive situations. However, they should not be tempered in the temperature range of 450 to 650°C. This reduces the hardness and wear resistance and also lowers the corrosion resistance because of the depletion of chromium in solution through the formation of chromium carbides. 

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