I guess that you need to blend between three settings:
1) the rod is cold (and black)
2) transition to hot (rod gets red)
3) rod is hot (that yellowish texture)
if you just blend between the texture and the black rod, you won't get any red in the transition zone
i'll give you two solutions. both the mix and composite maps can be found in Maps/Standard in the Material/Map browser.
solution 1:
you can do this using a "Mix" map in your diffuse slot.
In this material you have two slot (material 1 and material 2), and then another slot for the mask. If you put a gradient map in the mask slot, then your materials will get blended using that gradient.
you can then even animate the gradient so that you have your desired effect
of course, to blend three materials, what i would do would be to use one mix between hot and transition, mixing with the cold rod material
hierarchically it should be something like this:
#Mix
-Mask: Cold-to-hot gradient
-Material1: Cold Rod material
-Material2:
#Mix
-Mask: Red-to-hot-texture gradient
-Material1: Red Transition material
-Material2: Yellowish really hot material
solution 2:
you can also use a composite map to yous diffuse slot.
in this map you get slots that act as layers, and each layer has its own alpha mask, and blend mode, so that you can control the way they sum up
do whatever you feel more comfortable with, search for some tutorials on the Mix and Composite maps, so you'll understand how they work
Good luck
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