Effect of Boron Nitride Addition on the Microstructure and Mechanical Properties of PM Steels

Year 2017, Volume: 17 Issue: 1, 185 - 191, 24.04.2017

Mehmet Akif Erden Mustafa Türkmen Hasan Karabulut Süleyman Gündüz

Abstract

In this work, the effects of boron nitride additions on the microstructures and tensile behaviours of

microalloyed powder metallurgy (PM) steels were investigated. The microstructure of the microalloyed

PM steels was characterised by optic microscope, SEM and EDS. Results indicated that the addition of

boron nitride in the percentage of 0.1 and 0.2 increases the yield strength (YS) and ultimate tensile

strength (UTS) of the PM steels in the sintered conditions. Elongation also tends to improve with

increasing boron nitride content. In addition, the presence of boron nitride in different proportion

prevented grain growth during sintering or cooling after sintering. However, a further increase in BN to

0.5 wt.% reduced the yield strength (YS), ultimate tensile strength (UTS), percentage elongation and

hardness due to higher amount of precipitation strengthening.

Keywords

PM Steels, Boron Nitride, Microstructure, Mechanical Properties

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