Displacement Channel
The bump channel we just created is only a two dimensional effect, but it can be improved by combining its effect with the displacement channel.
Go to the anvil object's properties, and select the "Deform" tab. Click on the "T" button to create a displacement texture. You will probably find that simply copying your bump channel layers into the displacement channel won't look very nice - I've found that you are generally better off starting from scratch.
For my anvil, I found that Crumple seemed to work best, and I used a gradient layer to only apply it where the "Dents" weight map existed. The settings I used for Crumple were:
Layer Opacity 100% Displacement Axis Y Texture Value -0.04 Frequencies 4 Small Power 0.75
The gradient layer used was almost identical to the second gradient layer from the bump channel.
The displacement channel helps to age the anvil and make it look a bit rougher.
The great thing about procedurals, is that it's all completely adjustable via the weight map. So if you decide you want add aging marks to a different part of the model, it's just a matter of painting it on using the airbrush tool in Modeller.




