Abstract
In this study, damage mechanisms in the FeB/Fe2B coatings formed on the surface of AISI 304 steel are determined by adhesion tests. First, the boriding of the AISI 304 steel was carried out through the powder-pack method at 1223 K in the range from 2-10 h of exposure time. After treatment, Berkovich depth-sensing indentation test were conducted; the result showed tensil and compressive residual stresses in the FeB and Fe2B, respectively. The adhesion of borided steels was evaluated by the Daimler-Benz Rockwell-C and scratch test. Based on the scratch tracks, the chipping was the predominant mechanism at 2 and 6 h, with critical loads of 35 and 43 N, respectively; while spalliation was determined at 27 N for 10 h. Also, hertzian and tensil cracks, buckling and compressive delamination were determined in the AISI 304 borided steel by scanning electron microscope.
Highlights
AISI 304 steel is a general purpose austenitic stainless steel
Morphology of the boride layer is mainly caused by the alloying elements of AISI 304 steel; the nickel and chromium reduce the growth of the layer and dismish the degree of preferred orientation, decresing the saw-tooth morphology[7]
Figure 2c) shows a mixture of phases; the FeB phase is defined as a FeB-base phase since it generally contains high boron products disolved therein because it grows from the transformation of the Fe2B phase[19]
Summary
AISI 304 steel is a general purpose austenitic stainless steel. It has high ductility, excellent drawing, forming and spinning properties with lower susceptibility to intergranular corrosion and less carbide precipitation during welding in the heat-affected zone. Wear resistance can be improved, having a greater effect when the predominant phenomenon is the abrasive. Within these treatments, boriding is a surface modification, whereby boron is diffused into, and combines with, the substrate material resulting in the formation of iron borides. The boriding process can increase up to 2000 HV surface hardness, improving the tribological properties of hardened components.
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