Home Metallic Materials - Kovové materiály 2014 Metallic Materials Vol. 52 (2014), no. 5, pp.269-277

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Metallic Materials Vol. 52 (2014), no. 5, pp.269-277

Title: Assessment of fatigue damage development in power engineering steel by local strain analysis
Author: D. KUKLA, Z. KOWALEWSKI, P. GRZYWNA, K. KUBIAK

Abstract: The results of analysis of fatigue damage development in the X10CrMoVNb9-1 (P91) steel specimens subjected to various cyclic loading combinations are presented. The study concerning a quantitative assessment of damage is based on analysis of the fatigue hysteresis evolution in subsequent loading cycles. According to the elaborated algorithms, damage parameters were determined on the basis of two indicators, i.e., average strain and strain amplitude variations. Each of them was responsible for a single damage development mechanism. The average strain characterized ratcheting effect, which is usually related to local generation of plastic strain surrounding microstructural elements. The second damage mechanism called cyclic plasticity is connected with micro slips preceding slip bands formation. The paper also discusses the results of metallographic and fractographic microscopic (SEM) observations of the tested specimens in order to indicate microstructural aspects of fatigue damage development mechanisms.

Keywords: fatigue test, steels, fracture, scanning electron microscopy, microstructure
Year: 2014, Volume: 52, Issue: 5 Page From: 269, Page To: 277
doi:10.4149/km_2014_5_269


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