Abstract
Thermal fatigue resistance is one of the most important characteristics of the materials subjected to rapid temperature changes, i.e., high-pressure die casting, hot forging. Therefore the aim of the present study was to determine the suitability of using the functionally graded materials (FGM) in applications subjected to thermal fatigue. A specially designed thermal fatigue test was utilized, developed to be used on servo-hydraulic testing machine, Gleeble 1500D. The FGM samples were prepared using a laser cladding method that ensures sound welds. Two different filler materials on the AISI H13 tool steel were utilized, varying in the content of the silicon. The gradation in the properties was made by changing silicon content with varying welding parameters, and thus achieving gradation of the secondary carbide content. The test results show that the silicon distribution has large effect on thermal fatigue resistance; the resistance is decreasing with the increasing the content of silicon in the filler material. This was studied through the sequence of crack formation. The results of this study will contribute to prolonged use of die casting tools.
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