Fatigue Crack Growth in a Precipitation-Hardened Martensitic Stainless Steel: Influence of Ageing, Temperature and Loading History

Abstract:

The 15-5PH (precipitation-hardened) martensitic stainless steel is prone to embrittlement following ageing during service at temperatures between 300°C and 350°C. This results in an increase in strength and a decrease in elongation and fracture toughness. However little information is available on the consequences of long term ageing on fatigue crack growth resistance. In the present study this issue is precisely addressed at room temperature and 300°C, with different load ratio under constant amplitude loading and under variable amplitude loading.At room temperature, the results indicate a marginal effect of the load ratio, regardless of ageing conditions and temperature. While the Paris regime is not affected by ageing, a significant drop in the critical stress intensity value before unstable fracture is observed, reflecting a decrease in fracture toughness of the material with ageing. At 300°C, the FCGRs are higher than at room temperature for all ageing conditions. Variable amplitude loading tests carried out on differently-aged materials showed the same retardation effect.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 961-966
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.961
• Online since: March 2014
• Authors: Loic Dimithe Aboumou, Gilbert Hénaff*, Mandana Arzaghi, Sylvie Pommier
• Keywords: Fatigue Crack Propagation, Long Term Ageing, Overload, Temperature

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