Titanium is where additive manufacturing makes its clearest economic case. The metal is expensive, it is slow and hard on tooling to machine, and aerospace parts routinely start as a billet and finish at a small fraction of it, so the material thrown away as chips can outweigh the part many times over. Building near net shape changes that arithmetic completely.
The buy to fly argument
A machined aerospace titanium part can consume many times its own mass in billet, and that ratio is what makes additive attractive: a printed part consumes close to its own mass plus supports. Even at a high cost per kilogram of powder, the total material cost can fall, and the machining hours fall with it.
Grades and heat treatment
The workhorse alloy for printing is the common alpha beta aerospace grade, with commercially pure grades used for medical implants where corrosion resistance and biocompatibility matter more than strength. As built material is strong and comparatively low in ductility; stress relief is standard, and hot isostatic pressing plus a heat treatment is applied where fatigue performance governs.
Why medical adopted it
Titanium is biocompatible and osseointegrates, and additive manufacturing can build a porous lattice surface that bone grows into, which is not manufacturable any other way. Patient specific implants made from a scan are the other half of the case, since the part is a batch of one by definition and tooling is irrelevant.
Practical constraints
The powder is reactive and must be handled in an inert atmosphere. Builds are slow because titanium's melt behaviour rewards care. Supports must conduct heat as well as anchor the part, so they can be substantial and difficult to remove. And every accurate feature is machined afterwards, which needs stock and a fixturing datum designed into the part.
Questions people ask about titanium 3d printing
Why is titanium so suited to 3D printing?
Because it is expensive and wasteful to machine. Building near net shape saves both material and machining hours, which is where the economics turn.
Which titanium alloys are printed?
Mainly the common alpha beta aerospace alloy, with commercially pure grades used in medical implants where biocompatibility and corrosion resistance lead.
Are printed titanium parts strong enough for aerospace?
They can be, under a qualified process with the specified heat treatment and often hot isostatic pressing. Qualification is the barrier, not the material.
What makes titanium printing expensive?
Powder cost, inert handling requirements, slow build rates, substantial supports and a post processing chain that includes heat treatment and machining.