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. 2023;30(4):597-602. doi:10.56042/ijems.v30i4.961