TBM Cutters. High Demand.Today these Tunnel Boring Machines (TBM) are all over the place digging and moving people, water and other things to underground transport across the World.
https://www.facebook.com/SydneyMetro/videos/tbm-kathleen-breakthrough-throwback/774609100338078/
The cutter head is the total diametre of the tunnel, and the "cutters" are the disks strategically placed on the face of the head to cut the tunnel.
https://www.hindawi.com/journals/sv/2017/7156816/fig1/
Now the head needs to be just as robust as the cutters to resist wear and I think it would be very high in an alloy that containes Tungsten or some other metals..
So to replace a full face head is not an option, hence the cutter disks which are replaceable when needed, and do wear out at a massive pace when tunneling through hard rock.
I am not sure if these cutters are solid Tungsten Carbide, but they are sure to be a future in demand product. IMHO.
Just a thought.
The cutter head uses a combination of tungsten carbide cutting bits, carbide disc cutters, drag picks and/or hard rock disc cutters. The EPB machine's name come from the use of excavated material to create pressure at the tunnel face.