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I.

INTRODUCTION

N I T R I D I N G and nitrocarburizing are thermochemical surface treatments of iron and steel that bring about the following: a compound layer at the surface that is mainly composed of the iron (carbo)nitrides e-Fez(N, C)~ z and y'-Fe4(N, C)l_x, and a diffusion zone beneath the compound layer that, at the nitriding temperature (usually

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