Development of an Innovative Laser-Assisted Coating Process for Extending Lifetime of Metal Casting Dies. Final Report Page: 40 of 46
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0*8000 067
0.3 micron TiC Surface Glazed 2 micron TiC
Sample Identification (Arbitrary scale)
Figure 20. Plot of weight loss due to erosion of samples at two different temperatures.
7.4.3 Thermal Fatigue Resistance
Preliminary experiments for determination of thermal fatigue resistance or heat checking
behavior of H13 steels were performed using molten A390. The experiment had to be
discontinued due to experimental problems associated with metal splattering, broken
crucibles. Hence, further experiments were carried out by thermal cycling in air. The
experiments were performed using the experimental set up illustrated in Figure 7. The
samples were lowered into the hot zone of the furnace, which was held at 850*C. The
sample was pulled out after 15 seconds and air-cooled for 15 seconds to finish one
thermal cycle. The samples were tested for 5000 cycles. It was seen that all the laser-
processed samples performed the best with the least amount of weight pick up due to
oxidation. The primary conclusion is that under cyclic thermal oxidation tests at 850*C,
laser processed samples have demonstrated improved oxidation and thermal cracking
resistance.
7.5 Summary of Results
Table 11 shows a summary of the results obtained in the present investigation. The
results indicate an overall improvement in surface smoothness, hardness, corrosion, and
erosion resistance by laser processing.Karta Technologies, Inc., DoE SBIR Phase I Final Report
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Gonvindaraju, Madhav Rao. Development of an Innovative Laser-Assisted Coating Process for Extending Lifetime of Metal Casting Dies. Final Report, report, October 18, 1999; United States. (https://digital.library.unt.edu/ark:/67531/metadc712154/m1/40/: accessed May 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.