Variable thickness plate investment castings of AISI H13 steel were producted and characterized in the as-cast and heat-treated conditions. The characterization included light microscopy and mechanical testing. Wrought samples of standard and premium grade H13 were heat-treated and similarly characterized. Microstructural differences were observed in as-cast samples produced in different section thickness. Dendrite cell size and carbide morphology constitudet the most prominent differences observed. After a full heat-treatment, microstructural differences between the wrought and any of the cast materials were slight. The mechanical properties of the cast plus heat-treated material proved similar to the properties of the standard heat-treated wrought material. A thermal fatigue tester was designed and built to correlate the heat checking suspectibility with processing and consequent microstructure. Surface hardness decreased significantly with thermal cycling, with heat checking observed in as few as 50 cycles. It was found that the premium grade wrought H13 steel provided the best overall resistance to heat checking; however, the cast plus heat-treated an as-cast standard grade material exhibited only slightly poorer heat checking resistance than the premium grade.
Investment cast AISI H13 tooling for automotive applications
Nach dem Investment-Verfahren gegossener Werkzeugstahl AISI H13 für Kraftfahrzeuge
1995
10 Seiten, 6 Bilder, 3 Tabellen, 14 Quellen
Conference paper
English
Investment cast AISI H13 tooling for automotive applications
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