Microstructural characterization and mechanical properties of microalloyed powder metallurgy steels

Erden, Mehmet Akif; Gündüz, Süleyman; Türkmen, Mustafa; Karabulut, Hasan

doi:10.1016/j.msea.2014.08.026

Cited by 39 publications

(36 citation statements)

References 23 publications

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“…The authors revealed in their study that precipitates such as TiC(N) prevented the growth of grains during sintering and thus caused formation of small austenite grains and consequently increased the strength of materials. In other studies, (Erden et al 2014;Schade et al 2012a;Schade et al 2012b), it is reported that carbides and nitrides which are formed in microalloyed steels improve hardness and strength. In the same studies, it is stated that solid solution hardening remained in low ratios due to precipitation of carbides and nitrides.…”

Section: Microstructurementioning

confidence: 91%

“…Figure 3 shows the stress -strain diagram of the sintered specimens while It is considered that precipitates such as BC(N) inhibit the growth of grains during sintering and lead to formation of small austenite grains and consequently increase the strength of material. Erden et al (2014) produced Ti microalloyed steel by PM method in their studies. They performed the sintering process by keeping the steel specimens at 1150°C for 60 minutes and determined that, as the Ti ratio increased (0.1%-0.2%), there is an increase in yield and tensile strength values.…”

Section: Microstructurementioning

confidence: 99%

“…Steels are material groups which can have superior features such as high strength, low ductile-brittle transition temperature and high toughness by the application of various hardening mechanisms and suitable thermodynamic processes (Erden et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Main role of microalloyed elements are to reduce the grain size, prevent recrystallization and contribute to precipitate hardening (Erden et al 2014;Korchynsky, 2001;Sage, 1992). Boron nitride within the structure of cubic crystal is known to be one of the hardest elements after diamond, and it is also a perfect lubricator in high temperature applications when it exists within the structure of hexagonal crystal cage.…”

Section: Introductionmentioning

confidence: 99%

“…Today, although most of the microalloyed steels are produced as flat and pipe product, production of microalloyed steels for forging purpose is increasing. Although it is not widely preferred yet, microalloyed steels are also produced by powder metallurgy method today (Erden et al 2014;Schade et al 2012b). …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Erden¹,

Türkmen²,

Karabulut³

et al. 2017

AKU-J. Sci. Eng.

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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. Toz Metal Çeliklerin Mikroyapı ve Mekanik Özelliklerine Bor Nitrürün Etkisi Anahtar kelimeler Toz Metal Çelikler, BorNitrür, Mikroyapı, Mekanik Özellikler. ÖzetBu çalışmada, Mikroalaşımlı Toz metal (TM) çeliklerin mikroyapı ve çekme davranışları üzerine bor nitrür ilavesinin etkileri incelenmiştir. Mikroalaşımlı TM çeliklerin mikroyapıları optik mikroskop, SEM ve EDS analizleri kullanılarak karakterize edilmiştir. Sonuçlar; yüzde 0,1 ve 0,2 oranında bor nitrür ilavesinin TM çeliklerin akma dayanımını (YS) ve çekme mukavemetini (UTS) artırdığını göstermiştir. Ayrıca % Uzama oranı bor nitrür ilavesinin artmasıyla artma eğilimindedir. Buna ek olarak, farklı oranda bor nitrür varlığı sinterleme sırasında veya sinterleme sonrasında tane büyümesini engellemiştir. Ancak ağırlıkça % BN oranını 0,5 olduğunda akma dayanımı (YS), çekme dayanımı (UTS), % uzama ve sertlik değeri çökelme sertleşmesine bağlı olarak azalmıştır.

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Section: Microstructurementioning

confidence: 91%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Erden¹,

Türkmen²,

Karabulut³

et al. 2017

AKU-J. Sci. Eng.

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Dilatometric study of low-alloy steels with silicon carbide addition

Hebda

Dębecka

Kazior

2016

J Therm Anal Calorim

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Low-alloy steels produced via the traditional powder metallurgy process, using a die compaction, are currently widely used. Therefore, improving their properties is an issue that attracts much attention. The most common method of enhancing the properties of a given material is introducing additives, e.g., silicon to prealloyed low-alloy steels. It may be added through the mechanical alloying process. The article presents the results of research focused on an analysis of the influence of: (1) the mechanical alloying process, (2) various amounts of silicon carbide: 1, 2 or 3 mass% and carbon addition: 0.4 or 0.6 mass%, (3) different atmospheres, reducing or inert with 10 mass% of hydrogen and (4) the effect of annealing on phenomena occurring during the sintering of low-alloy steel. Moreover, changes in the sinters' microstructure and microhardness were also investigated. Based on the results, it was found that an increase in the amount of silicon in the material causes an increase in the shrinkage of the samples, prepared using mechanical alloying, during the sintering process. This observed effect was independent of the carbon content (0.4 or 0.6 mass%) in the samples as well as of the sintering atmosphere (reducing or inert with 10 mass% of hydrogen). The smallest porosity was observed for samples sintered directly after the mechanical alloying process. There is no need to use a hydrogen atmosphere during sintering-10 % of hydrogen added to an inert, e.g., helium atmosphere is enough to sinter the samples correctly.

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Effect of Carbon Content on Microstructure and Mechanical Properties of Powder Metallurgy Steels

Türkmen

2016

Powder Metall Met Ceram

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Microstructural characterization and mechanical properties of microalloyed powder metallurgy steels

Cited by 39 publications

References 23 publications

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

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

Dilatometric study of low-alloy steels with silicon carbide addition

Effect of Carbon Content on Microstructure and Mechanical Properties of Powder Metallurgy Steels

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