Abstract:
Boronizing processes were carried out at 900 ◦C, 950 ◦C and 1000 ◦C for 2, 4 and 6 h to improve the wear
performance of Monel 400 alloy. According to microstructure analyses and nanoindentation tests, Ni2B, FeNiB
and FeB phases were detected as dominant phases in the boronized layer. Apart from this, it was observed that
the amount of Cu deposits in the boronized layers increased depending on the increasing boronizing temperature.
After the boronizing process, the boride layer thickness and hardness values were found to be in the range of
32–272 μm and 12.76–17.83 GPa, respectively. From the results of dry sliding wear test, the wear volume loss
values of the boronized Monel 400 alloy decreased by approximately 25 times compared to the untreated
samples. The lowest volume loss value among all test samples was observed in the boronized sample at 950 ◦C for
4 h. In addition to the hardness value, it was determined that the morphology and mechanical properties of the
boronized layer were also effective on the wear results. Plastic deformation, delamination and oxidation type
wear mechanisms were observed as the dominant wear mechanisms in the room and high temperature tests of
boronized samples.