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

Authors : Mehmet Akif ERDEN, Mustafa TÜRKMEN, Hasan KARABULUT, Süleyman GÜNDÜZ

Pages : 185-191

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Publication Date : 2017-04-24

Article Type : Research Paper

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