I think Mack/Misophist was talking about the knives made by David Boye. He calls the metal "Dendritic Cobalt."
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Boye Dendritic Cobalt

Advanced new metallurgy for the ocean environment, Boye Dendritic Cobalt (BDC) is not a steel, but a metallic alloy composed of cobalt, chrome, nickel, tungsten, silicon, molybdenum, iron, and carbon.

BDC cuts aggressively, and keeps cutting. It is impervious to saltwater corrosion and is non-magnetizable.

What is "Dendritic"?
Dendritic comes from the Greek word meaning "branching" or "tree-like." It describes the crystalline pattern of hard carbide structures throughout each knife blade, as shown in the microscopic photo to the right.

These carbide crystals create micro-serrations along the cutting edge and maintain its structural integrity. Each sharpening exposes a fresh set of hard carbide micro-teeth.
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Look Here

I must try one of these some day.

clint