I doubt it would help. Your typical serrations only really work in a slicing motion. The ones pictured in your post look more like spikes to me, increasing the PSI in in impact, allowing it to penetrate the armor. With plate and mail armor as soon as you penetrate any point the immediate surrounding armor is compromised and becomes much easier to crush or cut.
That doesn't mean someone shouldn't try it. If nothing else it would look badass
That doesn't mean someone shouldn't try it. If nothing else it would look badass