Combination of mechanical and chemical pre-treatments to improve nitriding efficiency on pure iron

Victor Lacaille (1) , Véronique Peres (2, 3, 4) , Cécile Langlade (5) , Constance Morel (6) , Eric Feulvarch (7, 8) , Jean-Michel Bergheau (7) , Guillaume Kermouche (2, 9, 10)

1 EIGSI - École d'Ingénieurs en Génie des Systèmes Industriels [La Rochelle]
2 LGF-ENSMSE - Laboratoire Georges Friedel
3 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
4 PTSI-ENSMSE - Département Procédés de Transformations des Solides et Instrumentation
5 IRTES - LERMPS - Laboratoire d'Études et de Recherches sur les Matériaux, les Procédés et les Surfaces
6 WINOA
7 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
8 ENISE - Ecole Nationale d'Ingénieurs de Saint Etienne
9 PMM-ENSMSE- Département Physique et Mécanique des Matériaux
10 SMS-ENSMSE - Centre Science des Matériaux et des Structures

In this paper, the efficiency of gas nitriding on pure iron is observed regarding two types of pre-treatments prior to nitriding: chemical reduction by H₂ and nanocrystallization by NanoPeening^®. Thermogravimetric analysis reveals that both pre-treatments result in an increase in the transformation rate of nitrogen during the first 200 min of nitriding. Moreover, glow discharge optical spectrometry reveals that nanocrystallization by NanoPeening^® leads to a deeper penetration of nitrogen in the material.

Mots clés: Nitriding; Oxide reduction; Thermogravimetric analysis; Nanocrystalline material; Pure iron

Domaines: Génie des procédés; Matériaux

Victor Lacaille, Véronique Peres, Cécile Langlade, Constance Morel, Eric Feulvarch, et al.. Combination of mechanical and chemical pre-treatments to improve nitriding efficiency on pure iron. Applied Surface Science, 2017, 414, pp.73-81. ⟨10.1016/j.apsusc.2017.04.084⟩. ⟨hal-01522817⟩