Improving the Abrasive Wear Resistance of a Microalloyed Steel by Plasma Nitriding

AUTOR(ES)

Cesconetto, Maria da Conceição Rocha Lima, Franco Jr., Adonias Ribeiro, Vieira, Estéfano Aparecido

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

2015-04

RESUMO

The aim of this work was to study the micro-abrasive wear resistance of an API 5L X-70 microalloyed steel plasma nitrided under different conditions of time and temperature. Pulsed DC plasma nitriding experiments were performed under a treatment atmosphere of 10%N2 + 90%H2, at temperatures of 410, 440 and 470 °C and for nitriding times of 1, 3 and 5h. The results show that plasma nitriding performed at 440 °C and 1h led to the formation of a compound layer constituted mainly of ε-Fe2-3N nitride and a diffusion zone with large needle-like nitride, offering the highest wear resistance. The amount of γ’- Fe4N phase was found to increase with the plasma nitriding time, decreasing the wear resistance of the material.

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