Fractographic Study on the Fatigue Failure Surfaces of Heat-Treated and Shot Peened EN- 8 Steel (080M40/AISI 1040): FRACTOGRAPHIC ANALYSIS ON FATIGUE SURFACE OF HEAT- TREATED AND SHOT PEENED EN-8. IJEMS [Internet]. 2023 Aug. 1 [cited 2026 May 13];30(4):597-602. Available from: https://or.niscpr.res.in/index.php/IJEMS/article/view/961