Qualitative analysis demonstrates that cooling time affects Paris law parameters in HSLA steel S960QL, indicating important implications for fatigue behavior.
This paper examines the influence of cooling time in the temperature interval from 800°C to 500°C (Δ t 8/5 ) on the Paris law parameters C and m for HSLA steel. Fatigue crack growth tests were performed on specimens machined from S960QL steel plates subjected to different cooling times. The test specimens were prepared in accordance with ISO 148‐1:2009, with a 2 mm deep V‐notch introduced into each specimen. Experimental data obtained using a RUMUL Cracktronic 160‐Nm resonant testing machine were used to determine crack growth rate diagrams as a function of the stress intensity factor range. Based on these diagrams, the Paris law parameters were calculated for different Δ t 8/5 values. The results show that variations in cooling time significantly influence the parameters C and m and the fatigue crack growth behavior. In addition, a numerical analysis using the extended finite element method (XFEM) was carried out to verify fatigue life simulation models by implementing experimentally determined parameters for each cooling condition.
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Dunđer et al. (2026) studied this question.
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