Abstract
Burnishing improves fatigue strength, surface hardness and decrease surface roughness of metal because this process transforms tensile residual stresses into compressive residual stresses. Roller burnishing tool is used in the present work on low carbon steel (AISI 1008) specimens. In this work, different experiments were used to study the influence of feed parameter and speed parameter in burnishing process on fatigue strength, surface roughness and surface hardness of low carbon steel (AISI 1008) specimens. The first parameter used is feed values which were (0.6, 0.8, and 1) mm at constant speed (370) rpm, while the second parameter used is speed at values (540, 800 and 1200) rpm and at constant feed (1) mm. The results of the fatigue test showed that improvement in fatigue limit, where the highest fatigue limit was obtained at (1mm feed, 1200rpm speed) in burnishing process which was (169 Mpa). The hardness results, showed increasing feed and speed values lead to increasing the hardness. The burnishing process reduces surface roughness by producing accurate and better surface finish. The best surface fineness of metal at (1mm feed and 1200 rpm speed) was 0.11 μm.
Highlights
Fatigue strength is one of most common mechanical properties
The applied stresses were in a range of (91.5-189 MPa). the fatigue limit of (0.6mm feed and370rpm) burnished low carbon steel (AISI 1008) was at 91.5 MPa
The applied stresses were in a range of (159-248.5 MPa). the fatigue limit of (1mm and 800rpm) burnished low carbon steel (AISI 1008) was at 159 MPa
Summary
Fatigue strength is one of most common mechanical properties. Durability and reliability of car part is usually defined by its fatigue resistance, so most of them can be loaded by dynamic load. That is related with the fact that most severe fatigue plastic deformations occur in one grain thickness layer of the metal surface [1]. Most important impacts of roller burnishing improve the fatigue strength, the surface hardness and surface roughness. This process can be transform tensile residual stresses, present in the surface zone after turning, to compressive residual stress [3]. Burnishing process is a cold working process in which plastic deformation happens by applying the pressure within a roller or ball on metal surface. This process is strengthening and finishing process [4].
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