In metal solidification. the cooling rate is an important factor in determining the resultant grain structure of the material. The paper discusses the results of a feasibility study done to determine whether a laser pulse scheme can be designed to affect, and eventually control, the resultant microstructure of the deposited material. A factorial experimental approach is applied to determine the significant parameters affecting grain size and orientation. Parameters investigated include maximum pulse power, pulse frequency, pulse shape, and material feed rate. Particular attention is given to parameter combinations that can cause grain growth through the layer boundaries of the deposited metal.
T. E. Sparks et al., "Effect of Structured Laser Pulses on Grain Growth in H13 Tool Steel," Proceedings of the 17th Annual Solid Freeform Fabrication Symposium (2006, Austin, TX), pp. 261-267, University of Texas at Austin, Aug 2006.
17th Annual Solid Freeform Fabrication Symposium, SFF 2006 (2006: Aug. 14-16, Austin, TX)
Mechanical and Aerospace Engineering
Article - Conference proceedings
16 Aug 2006