High chromium irons are attracting attention as wear resistant material especially in thermal power plants which tend to fracture under impact for past three decades. Hence, various methods as to be employed to possess better impact behavior without sacrificing the wear resistance. To meet these demands, alloying chromium with elements such as nickel or copper or manganese has been carried out, owing to their tendency to favor austenite stabilization. Of these, manganese finds favor as ferro-alloys are available commercially and are less expensive compared to others elements. Investigation in this direction with the use of manganese up to 10 wt. % in chromium iron system have shown to yield better wear and impact performance. Further, a novel non-destructive testing method ie., positron lifetime spectroscopy for characterizing the defect quantification has been attempted. The purpose of this study is to establish a correlation between tribological and positron lifetime spectroscopy parameters involving microstructural analysis.