Title: Micro-abrasive wear of boride layers on AISI D2 tool steel produced by the thermoreactive process
Authors: C.K.N. De Oliveira, G.E. Totten, A. Lombardi Neto, L.C. Casteletti
Addresses: Departamento de Engenharia de Producao, Universidade Regional do Cariri, Pos-graduacao Interunidades em Ciencia e Engenharia de Materiais, Universidade de Sao Paulo, Sao Carlos, SP, Brazil. ' Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97207, USA. ' Departamento de Engenharia de Materiais, Aeronautica e Automobilistica, Universidade de Sao Paulo, Sao Carlos, SP, Brazil. ' Departamento de Engenharia de Materiais, Aeronautica e Automobilistica, Universidade de Sao Paulo, Sao Carlos, SP, Brazil
Abstract: Boride layers were formed on AISI D2 steel by the thermoreactive deposition/diffusion (TRD) process in borax baths, containing ferroniobium and aluminium, at 1000°C/4h. They were characterised by optical microscopy, Vickers microhardness, X-ray Diffraction (XRD), Glow Discharge Optical Spectroscopy (GDOS) and micro-abrasive wear tests. Depending on the bath composition, Fe2B or FeB was the predominant phase in the borided layers. The layers exhibited a lenticular morphology with thicknesses varying from 60 to 120 mm, and hardnesses in the range of 1596 to 1744 HV. Wear resistance of the borided samples was superior to the hardened, uncoated AISI D2 steel. The wear mechanism observed was abrasive wear.
Keywords: boronising; iron boride; hardness; microabrasive wear; AISI D2; tool steel; thermoreactive deposition; abrasive wear.
International Journal of Microstructure and Materials Properties, 2008 Vol.3 No.2/3, pp.241 - 253
Available online: 16 Jun 2008 *Full-text access for editors Access for subscribers Purchase this article Comment on this article