Abstract
In the casting process, alloying elements Mo and Cr are needed to improve the wear resistance of medium manganese steels for low impact energy. The element Ti is added to avoid the high cost of expenditure for using Mo. This paper studies the effect of Ti and Cr on microstructure and properties of medium manganese steel. It shows that a large number of polygon, column, and square (Ti, Cr) C particles (<13 μm) are formed in the casting samples using the present heat treatment process. A new type of Ti–Cr modified medium manganese steel (Ti content of 0.56%–1.48%) is produced by using (Ti, Cr) C reinforced phase particles. Compared with the traditional medium manganese steel (blank), the hardness increases twice with a slight decrease in impact toughness [traditional and modified medium manganese steels (blank and steels A, B, and C) have values of 42.1 J/cm2, 47.5 J/cm2, 43.8 J/cm2, and 37.9 J/cm2], and the wear resistance also increased nearly two times.
Highlights
IntroductionHigh manganese steel is one of the earliest steel materials with good hardness and toughness
High manganese steel is one of the earliest steel materials with good hardness and toughness. It can be used in high impact energy conditions because of its excellent wear resistance
Medium manganese steels have poor wear resistance and delayed cracking due to their austenite stability, which can be amended if valuable alloying elements are added
Summary
High manganese steel is one of the earliest steel materials with good hardness and toughness. It can be used in high impact energy conditions because of its excellent wear resistance. TiC particles can hinder the coarsening of austenite grains.[3–8] The precipitates of TiC and Cr7C3 formed during the rolling and cooling process can improve the hardness of steel as the dispersion and precipitation strengthens it; TiC and Cr7C3 have high micro-hardness at high and room temperatures, which can significantly improve the hardness of the steel matrix.[9–14]. Ti and Cr can improve micro-hardness, high temperature oxidation resistance, and wear resistance of the steel matrix TiC particles can hinder the coarsening of austenite grains.[3–8] The precipitates of TiC and Cr7C3 formed during the rolling and cooling process can improve the hardness of steel as the dispersion and precipitation strengthens it; TiC and Cr7C3 have high micro-hardness at high and room temperatures, which can significantly improve the hardness of the steel matrix.[9–14] Ti and Cr can improve micro-hardness, high temperature oxidation resistance, and wear resistance of the steel matrix
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