Title: CRITICAL DEFECTS IN DIFFERENT SINTER HARDENING GRADE STEELS TESTED UNDER GIGACYCLE FATIGUE LOADING
Abstract: Ultrasonic resonance fatigue testing with 20 kHz frequency enables a very fast testing of different materials up to very high loading cycle numbers, 1 billion cycles taking only 15 hours; this method is also extremely sensitive to larger defects. Therefore it is a perfect tool for investigating the critical defects responsible for failure. In the present study different sinter hardening grade steels alloyed with Cr and Mo/Ni were tested up to 10 9 cycles. It turned out that Cr alloy steels show superior fatigue endurance strength but are more sensitive to intergranular failure initiation compared to Mo/Ni and Cu based ones. The reason for this difference caused by the alloying system can be explained by the high tendency to form brittle grain boundary carbides for Cr low alloyed steels.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 3
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