Iron boride

Iron boride

Surface Hardening

Published in P. C. Angelo, B. Ravisankar, Introduction to Steels, 2019

In the same way, if the other interstitial element boron is diffused to the surface of steel, it is called boriding or boronizing. The boron diffused surface contains metal borides, such as iron borides, nickel borides, and cobalt borides. As pure materials, these borides provide extremely high hardness and wear resistance. These favorable properties are manifested even when they are a small fraction of the bulk solid. Boronized steel parts being extremely wear resistant will often last two to five times longer than components treated with conventional heat treatments such as hardening, carburizing, nitriding, nitrocarburizing or induction hardening. Most borided steel surfaces will have an iron boride layer with hardness ranging from 1200–1600 HV.

A Method for Inhibiting Corrosion of Type 316L Stainless Steel in High-Temperature Molten Chloride Salt

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Journal Information

Published in Nuclear Science and Engineering, 2023

Brendan D’Souza, Amanda Leong, Jinsuo Zhang

Boronization technology has been well developed; however, there are still some technical difficulties for boronization of ferrous-based steels. In the present study, the boronizing agent and procedure were the same for S01 and S02 but resulted in two different boride layer structures. Unlike nickel-based alloys, boronization of ferrous-based alloys is more complicated due to the formation of dual iron boride phases (FeB-Fe2B). These phases may exhibit thermal instability due to differences in their thermal expansion coefficient.

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Surface Hardening

A Method for Inhibiting Corrosion of Type 316L Stainless Steel in High-Temperature Molten Chloride Salt