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

References

• Bakkali E., Chenaouia A, Dkiouaka R, Elbakkalib L., 2008. Characterization of deformation stability of medium carbon microalloyed steel during hot forging using phenomenological and continoum criteria. Journal of Materials Processing Technology, 140–149.
• Cuddy L. C., Raley J. C., 1983. Austenite grain coarsening in microalloyed steels, Metallurgical and Materials Transactions A, 14, 1989-1995.
• Erden M. A., Gündüz S., Türkmen M., Karabulut H., 2014. Microstructural characterization and mechanical properties of microalloyed powder metallurgy steels. Materials Science and Engineering A, 616, 201-206.
• Erden M. A., 2016. Effect of C Content on Microstructure and Mechanical Properties of Nb V Added Microalloyed Steel Produced by Powder Metallurgy Method. European Journal of Science and Technology, 5(9), 44-47.
• Erden M. A., 2017. Presleme Basincinin Toz Metalürjisi İle Üretilen Alaşimsiz Çeliklerinin Mikroyapi Mekanik Özellikleri Üzerine Etkisinin Araştirilmasi. Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi, 6(1), 257-264.
• Gladman, T., 1997. The physical metallurgy of microalloyed steels. The Institue of Materials, England, 1, 341.
• Gladman, T. and Woodhead, J. H., 1960. The accuracy of point counting in metallographic investigations, Journal of the Iron Steel, 194, 189 (1960).
• Gündüz S., Erden M. A., Karabulut H., Türkmen M., 2016. Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed pm steels. Materials and technology 50 (5), 641–648.
• Irvine K. J, Pickering F. B., 1963. Low carbon steels with ferrite–pearlite structures. The Journal of the Iron and Steel Institute. 201, 944–959.
• Kostryzhev AG, Al Shahrani A, Zhu C, Cairney JM, Ringer SP, Killmore CR., 2014. Effect of niobium clustering and precipitation on strength of an NbTimicroalloyed ferritic steel, Materials Science and Engineering: A, 607, 226–235.
• Korchynsky M., 2001. A new role for microalloyed steels − adding economic value. Presented at Infacon 9; Quebec City, Canada, 1-6.
• Llewellyn D. T., Hudd R. C., 1998. Steels: metallurgy and applications, 3th edn, Reed Educational and Professional Publishing Ltd, Oxford.
• Ollilainen, V., Kasprzak W., Hollapa L., 2003. The effect of slicon, vanadium and nitrogen on the microstructure and hardness of air cooled medium carbon low alloy steel. Journal of Metarials Processing Technology, 134, 405-412.
• Öztaş, E., 2012. Hexagonal Boron Nitride Mold Release Characterization and in availability. Master's Thesis. Gazi University, Ankara, 59.
• Radis R., Kozeschnik E. 2010. Kinetics of AlN precipitation in microalloyed steel, Model Simul. Mater. Sci. Eng., 18 (5), 605–611.
• Robert, M., 1984. Powder Metallurgy Science. Metal Powder Industry Federation, New Jersey, 1-50.
• Sage A. M., 1992. An overview of the use of mikroalloys in hsla steels with particular reference to vanadyum and titanium, processing, properties and applications. Proceedings of the Second International Conference on HSLA Steels, 51-60.
• Sarıtaş, S., Türker, M, Durlu, N., 2007. Powder Metallurgy and Particulate Materials Processing, Turkish Powder Metallurgy Association, 2nd ed., Ankara, Turkey, 5-33, 217-230.
• Schade C, Murphy T, Lawley A, Doherty R., 2012. Microstrucure and mechanical properties of microalloyed PM steels. International Journal of Powder Metallurgy, 48, 51-59.
• Schade, C., Murphy, T., Lawley A., Doherty R., 2012. Microstructure and mechanical properties of PM steels alloyed with silicon and vanadium. International Journal of Powder Metallurgy, 48 (6), 41-48.
• Xiang-done H., Xin-ping M, Sheng-xia L., 2013. Effect of annealing temperature on recrystallization behavior of cold rolled Ti-microalloyed steel. Journal of Iron and Steel Research International, 20 (9), 105-110.