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Effect of Inoculation by Niobium and Nickel on the Hardening Phenomenon and Wear of High Manganese Steel (12% Mn)

Auteurs : Hichem MAOUCHE, Ali HADJI 1, Khédidja BOUHAMLA
Année : 2016
Domaine : Métallurgie
Type : Communication
Conférence: Junior Euromat 2016
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : manganese steel, inoculation, effect of niobium, effect of nickel, effect of niobium nickel, hardened part, Wear resistance.

Résumé :

High Manganese Steel demonstrates a great rate of work hardening during service, together with good toughness, leads to its widespread use in the heart switching crossings of railways, excavators, mineral crushing equipment and other severe mechanical environments. The hardness of Manganese Steel is only about 20 HRC when subjected to water toughening. This low hardness is usually associated with poor wear resistance and severe plastic deformation, as well as abrasion of the working surface of the railway crossing during the initial service period, which remarkably reduces its service lifetime. In this study we focus on the influence of inoculation by niobium and nickel on the phenomenon of surface hardening or work hardening and wear resistance. The transformation of austenite during operation, thus determines the steel operating lifetime, the rate of transformation of austenite to martensite can introduce a compromise between ductility and wear resistance of the steel to support large efforts without breaking. The objective of this study is to improve the wear resistance by abrasion and friction after heat treatment of manganese steel alloyed with niobium and nickel. The addition of these elements promotes secondary hardening and allows slower transformation of austenite during the heat treatment. The results showed that the introduction of niobium and nickel has strongly influenced the character of the structure crystallization before hardening (Part hardened) by precipitation carbides form and finesse variables is observed in the microstructure before heat treatment and complete dissolution is noted after heat treatment, for the hardened part (work hardening) we observed a greater thickness and hardness compared to the base steel and net improvement in wear resistance.