Heat treating assembly and method

1. A heat treating assembly comprising:

a laser operative to emit laser energy;

a substrate having a defined area exposed to said laser energy to alter said defined area of said substrate; and

a tool disposed in removable contact with said substrate adjacent said defined area and having a thermal conductivity greater than that of said substrate to conduct heat energy away from said defined area, wherein said tool has a reflectivity greater than said substrate.

2. An assembly as set forth in claim 1 wherein said tool has a reflectivity of at least 65% at a wavelength of 1000 nanometers.

3. A heat treating assembly comprising:

a laser operative to emit laser energy;

a substrate having a defined area exposed to said laser energy to alter said defined area of said substrate, wherein said defined area has a microstructure that is modified as a result of exposure to said laser energy and wherein said defined area includes an exposed edge; and

a tool disposed in removable contact with said substrate adjacent said defined area and having a thermal conductivity greater than that of said substrate to conduct heat energy away from said defined area, wherein said tool is disposed immediately adjacent said exposed edge to limit the altering of said microstructure to said defined area and to prevent heat energy build-up near said edge.

4. An assembly as set forth in claim 3 wherein said substrate is formed of a material different than said tool.

5. An assembly as set forth in claim 4 wherein said tool has a thermal conductivity of greater than 150 W/m K.

6. An assembly as set forth in claim 3 wherein said substrate is further defined as an iron containing material.

7. An assembly as set forth in claim 3 wherein said defined area absorbs said laser energy and produces heat energy that modifies said microstructure.

8. An assembly as set forth in claim 3 wherein said tool has an exterior surface parallel to said exterior surface to said substrate.

9. An assembly as set forth in claim 3 wherein said tool comprises at least one of a cooper material, a gold material, a silver material, or an aluminum material.

10. An assembly as set forth in claim 3 wherein said laser is further defined as a diode-type laser.

11. An assembly as set forth in claim 10 wherein said diode-type laser emits a laser line of light to produce said laser energy.

12. An assembly as set forth in claim 11 wherein said laser line of light has a wavelength of from 500 nanometers to 1000 nanometers.

13. An assembly as set forth in claim 12 wherein said laser line of light has a width of from 0.1 millimeters to 1 millimeters and a length of from 5 millimeters to 20 millimeters.

14. An assembly as set forth in claim 3 wherein said laser has a power of from 500 watts to about 10 kilowatts.