A 2.9 GPa modified M50 steel with Remarkably high fatigue strength by Nb and Al alloying

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• High fatigue strength is achieved in modified M50 steel, enhancing its mechanical properties significantly.
• The addition of niobium and aluminum contributes to improved properties under fatigue conditions, maximizing durability.
• Experimental analysis on modified M50 steel reveals a fatigue strength of 2.9 GPa, outperforming standard alloys.
• The findings indicate potential applications in high-performance engineering; further validation is essential for practical use.