What are the pros and cons of titanium lawnmower blades?
I assume you want longer blade life ? As a metallurgist I can't think of any advantage for Ti. I have weld hard-faced steel blades  ( 5% Cr+ C ).They cut well but it was very difficult to grind a sharp edge on the rounded weld deposit. My current cheap mower blade is doing very well and I realized all that is needed is to harden it - quench and temper ( Q &amp; T ). The large majority of blades are just cold rolled steel , not hard. They are relatively low carbon like nearly all ordinary steels , that can make Q &amp; T difficult. But it can be done with high austenitizing temperature ,like 1650F, and quenching into salt water. There are other more expensive things that can be done.