Effect of bombarding steel with Xe+ ions on the surface nanostructure and on pulsed plasma nitriding process

Autor(es)

Cucatti, S. ^[1] ; Ochoa, E. A. ^[2] ; Morales, M. ^[1] ; Droppa, Jr., R. ^[3] ; Garcia, J. ^[4] ; Pinto, H. C. ^[5] ; Zagonel, L. F. ^[1] ; Wisnivesky, D. ^[6] ; Figueroa, C. A. ^[7] ; Alvarez, F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] PUCRJ, Dept Fis, BR-22451900 Rio De Janeiro - Brazil

^[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

^[4] Sandvik Coromant R&D, SE-12680 Stockholm - Sweden

^[5] EESC USP, Escola Engn Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[6] Plasma LIITS Equipamentos & Proc, BR-13083970 Campinas, SP - Brazil

^[7] Univ Caxias Do Sul, CCET, BR-95070560 Caxias Do, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 149, p. 261-269, JAN 15 2015.
• Citações Web of Science: 10

Resumo

The modification of steel (AISI 316L and AISI 4140) surface morphology and underlying inter-crystalline grains strain due to Xe+ ion bombardment are reported to affect nitrogen diffusion after a pulsed plasma nitriding process. The ion bombardment induces regular nanometric patterns and increases the roughness of the material surface. The strain induced by the noble gas bombardment is observed in depths which are orders of magnitude larger than the projectiles' stopping distance. The pre-bombarded samples show peculiar microstructures formed in the nitrided layers, modifying the in-depth hardness profile. Unlike the double nitrided layer normally obtained in austenitic stainless steel by pulsed plasma nitriding process, the Xe+ pre-bombardment treatment leads to a single thick compact layer. In nitrided pre-bombarded AISI 4140 steel, the diffusion zone shows long iron nitride needle-shaped precipitates, while in non-pre-bombarded samples finer precipitates are distributed in the material. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/10127-5 - Pesquisa e desenvolvimento de materiais nanoestruturados para aplicações eletrônicas e de física de superfícies
• Beneficiário: Fernando Alvarez
• Modalidade de apoio: Auxílio à Pesquisa - Temático