Journal Article

FZJ-2018-05859

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Frequency and Hold Time Influence on Crack Growth Behavior of a 9–12% Cr Ferritic Martensitic Steel at Temperatures From 300 °C to 600 °C in air

Fischer, T. (Corresponding author)FZJ* ; Kuhn, B.FZJ*

2018
Elsevier Oxford

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Please use a persistent id in citations: http://hdl.handle.net/2128/24795  doi:10.1016/j.ijfatigue.2018.03.012

Abstract: Due to an increase of renewable energies proportion, e.g. wind power and photovoltaics, which cannot supply energy constantly, modern power plants must be able to be operated flexibly in order to compensate the residual load. As a consequence of increasing alternating load, fatigue damage becomes more and more important, while creep damage caused by ever shorter holding times at high operating temperature decreases. In this study a turbine bypass valve, one of the most fatigue loaded power plant components, manufactured from widespread standard 12% Cr ferritic/martensitic steel X20 was investigated. Fatigue crack growth experiments showed that the crack growth rate increases slightly with decreasing frequency (20 Hz → 5 Hz). In hold time tests (300 s → 600 s, effective frequency 3.33 × 10−3 Hz → 8.33 × 10−4), larger crack propagation rates per cycle occur than in the fatigue crack growth experiments with 5 and 20 Hz. In comparison to pure cyclic loading maximum load holding time further required significantly higher ΔK values to start crack growth.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 111 - Efficient and Flexible Power Plants (POF3-111) (POF3-111)

Appears in the scientific report 2018

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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