Multi-component boron coatings on low carbon steel AISI 1018

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2.4.3 Properties of Boronized Steels
After <strong>boron</strong>izing, steels will have the desirable properties on the surface, including the
increase of wear resistance, corrosion resistance, and enhance the service life in 3-10
times.
1. Toughness
The boride layer provides the good bonding with the base metal, which can ensure that
under load, the flaking or the peeling will not happen. However, the toughness of the
<strong>boron</strong>ized steel relies on its boride layer thickness, cross-section area, and mechanical
properties. In the bending test, the <strong>boron</strong>ized specimen with the boride-layer thickness of
150-200 lam has 4% elongation without cracking [1].
2. Adhesion Resistance
The <strong>boron</strong>ized surfaces show neither accretion nor wear of material as well as having
hardly any tendency to cold-weld [11]. Consequently, this property is used in the coldmetal
working (chipless shaping) as a tool to form the metals. Without the non-lubricant,
the <strong>boron</strong>ized layers do not have an appreciable change at 300 °C in order to protect the
environment by reducing the lubricant.
3. Abrasive Wear Resistance
High microhardness provides a high wear resistance. Some properties of <strong>boron</strong>ized steels
are depicted in Figures 2.4 and 2.5.