Two Basic Techniques:
1st: Steam Bending. Put wood in a steam bath, average 1 hour per inch of thickness. What I have found is that unless you can pressurize the steam, it doesn’t get much hotter than boiling water, but is sufficient to bend most woods. However, soaking it a bit (15 minutes on 3/8 – 1/2 thick and an hour on 1″ or more), then submerging it or better pour hard boiling water on it to get it as hot as you can, it bends alot better.
2nd: Laminate bending. Using the strips clamped or pressed into a form, glued together works super well on long flowing or light radius work. Hard, tight radiuses, giving the wood a quick hot bath, then prebending and allowing to dry before gluing works best. Less breakage and far less spring back. Once bent, let dry in the form overnight, then remove and let dry. If you are still getting alot of spring back, put some double layer paper towels between the strips and reclamp for a day or so. You may have to change the paper towels once. When it’s dry enough to hold most of the form (let it dry well), it doesn’t take long. On 1/8″ thick strips then glue into position and it will hold the form. Another way is to simply increase the number of strips and use thinner ones. If you use the prewet and bend method, try a polyurethene glue. It uses moisture to cure and will negate any moisture remaining in the wood.
The above is based on a knock-down mad (cussing) experiment I did.