If Rich is right and the piece work hardened (and from what I've heard about titanium, he probably is), don't try to restart the cut in the same place. After you check your blade and replace it if it's dull (which I'd bet it is), flip the piece over in the vise and restart the cut from the back. Make sure you've got plenty of feed pressure at all times. You may want to consider placing the blade against the block before starting the saw, or even adding weights to increase the pressure. Once you reach the work-hardened area at the bottom of the original cut, it won't be supported by anything and hopefuly will rip out.
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