Investigation of compound layer formed during ion nitriding of AISI 4140 steel
SURFACE & COATINGS TECHNOLOGY, vol.80, no.3, pp.283-286, 1996 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 80 Issue: 3
- Publication Date: 1996
- Doi Number: 10.1016/0257-8972(95)02471-9
- Journal Name: SURFACE & COATINGS TECHNOLOGY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.283-286
- Keywords: ion nitriding, compound layer
- Dokuz Eylül University Affiliated: No
Abstract
Low alloy AISI 4140 steel was ion nitrided at temperatures of 500, 550 and 600 degrees C for various times in a 50%N-2-50%H-2 gas mixture. The nature of the compound layer formed was studied by X-ray diffraction and optical metallography. The X-ray analysis shows the existence of a gamma-Fe4N compound zone on the surface at all three temperatures. The thickness of the compound layer increases with increasing time at 500 and 550 degrees C; however, it begins to decrease with increasing time at 600 degrees C.