Pre-fatigue training doubles the fatigue limit of high tensile strength (1.6 GPa) martensitic steel, by using fatigue deformation to suppress cracking

https://www.eurekalert.org/news-releases/1095898

"microstructural design strategy for crack-initiation-resistant material also improves fatigue limit in steels generally... key is suppressing crack initiation rather than termination... fatigue crack initiation in high-strength steels is caused by elastic strain mismatch in loading direction at grain boundaries... better than conventional method of heat treatment that inevitably sacrifices tensile strength... goal is to improve feasibility of ultra-high-strength materials"