Jayanam.com posts a look at creating chain links easily in blender, by using the Array Modifier and the Curve Modifier. Creating a length of chain in Blender can be a super simple task, as shown in the tutorial. The trick is to build the chain so that you are able to make edits easily, such as sculpting the shape of the chain link, without too much trouble.
Here, the tutorial shows how to create chains can be built in Blender with a few simple steps. Check out the tutorial for Creating Chains in Blender here.