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Microstructure Characteristic and Impact Wear Behavior of Nb-Alloyed High Manganese Steels

Journal of Materials Engineering and Performance, ISSN: 1544-1024, Vol: 32, Issue: 20, Page: 9040-9050
2023
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Article Description

The microstructure characteristics and impact wear behavior of three high manganese steels with different Nb contents were investigated. The impact wear behavior of the Nb-alloyed steels was evaluated under different impact energies and times. The results showed that the microstructures of the three high manganese steels were mainly austenite and a small number of carbides. High manganese steel with 0.04 wt.% Nb addition (Nb04 steel) demonstrated excellent comprehensive mechanical properties. The yield strength could be 425.6 MPa, the impact toughness could be 372.5 J/cm, and the hardness could be 234 HV through the grain-fine strengthening effect and precipitation strengthening effect. The good combination of toughness and hardness contributed to the superior impact wear resistance. The depth of affected layer and the final hardness of the impact surface reach 4500 µm and 684 HV, respectively, for the Nb04 steel. Various wear mechanisms worked together to cause the material loss during the impact wear process. The worn morphologies of the three steels were mainly characterized by press-in particles, furrow, strain fatigue and delamination. A proper number of Nb content could make the twin system more sensitive and it provided a kind of alloying idea for the composition design of high manganese steel.

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