Östemperlenmiş Küresel Grafitli Dökme Demirlerde İndüksiyonla Yüzey Sertleştirmenin Yorulma Sınırı Üzerine Etkisi

Oktay, Erkun; Kılıçlı, Volkan; Erdoğan, Mehmet

doi:10.29109/gujsc.401600

Cited by 3 publications

(3 citation statements)

References 29 publications

(55 reference statements)

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“…Çelik ve dökme demir malzemelerde mikro yapıyı oluşturan fazların hacim oranları malzemenin mekanik özelliklerini belirlemede büyük önem taşımaktadır [1][2][3]. Özellikle bu durum, yapısında kalıntı östenit içeren düşük alaşımlı yüksek mukavemetli çelikler [4], çift fazlı çelikler [5], TRIP çelikleri [6] gibi malzemelerde ön plana çıkmaktadır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Su Verilmiş AISI 52100 Çeliğinde Metalografik Numune Hazırlama İşlemlerinin Kalıntı Östenit Hacim Oranına Etkisi

Nalçaci¹,

Kılıçlı²,

Erdoğan³

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, metallographic examination samples prepared under different loads. In order to investigate the retained austenite transformation X-Ray diffraction used and phase volume fraction calculated according to the direct comparison method. Figure A. Parts of XRD devicePurpose: Metallographic sample preparation is the first step of the microstructural characterization methods. During this process, possible phase transformation might mislead the researchers on performed work. That is why, the aim of this study provides more qualified characterization by determining the effect of load on metallographic sample preparation. Theory and Methods:In the present study, fully automatic metallographic grinding and polishing machine was used with different loads (20N-40N-80N-100N). Surface roughness was measured because of the effect of surface roughness on the XRD pattern. The retained austenite volume fraction of these samples was calculated via XRD. Results:The results have shown that XRD pattern of these four samples is quite similar to each other. Conclusion:It is thought that the high martensite volume fraction prevented the transformation of retained austenite; hence the retained austenite could maintain its stability during the metallographic sample preparation.

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Section: Gi̇ri̇ş (Introduction)unclassified

Su Verilmiş AISI 52100 Çeliğinde Metalografik Numune Hazırlama İşlemlerinin Kalıntı Östenit Hacim Oranına Etkisi

Nalçaci¹,

Kılıçlı²,

Erdoğan³

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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“…Spherical graphite cast iron that is hardened by induction are frequently used in structural elements where wear, fatigue and tensile strength should be good, such as camshafts, which are important tasks in motor vehicles in the automotive industry [5,6]. * corresponding author; e-mail: bahadir.karaca@estas.com.tr Different structures are formed in ductile graphite cast iron by surface hardening with induction process according to steel materials.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Heat Treatment on the Tensile Properties of Camshaft made of GGG70 Series Spherical Graphite Cast Iron

Karaca

Şi̇mşi̇r

2019

Acta Phys. Pol. A

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The aim of this study is to investigate the effects of austempering and induction hardening on the tensile properties of GGG70 ductile cast iron for camshaft production. For this purpose, camshafts have been produced by sand mould casting method. For nodulizing process, Fe-Si-Mg alloy has been used and Fe-Si-Ba-Ca-Al alloy has been for inoculation process. The casting has been done between 1420-1440 • C and the pouring time was in between 11-13 s. The casted camshafts have been austenitized at two different temperatures and time under controlled furnace atmosphere. The austenitized camshafts have been quenched into the molten salt bath at 320 • C temperature and held 90 min and then cooled in air. By this way, austempering heat treatment has been applied. After that, surface hardening process was conducted by induction hardening machine with medium frequency. Microstructures of camshafts have been examined by optical and mechanical tests (hardness and tensile tests) have been performed. The fracture surfaces of tensile specimens were examined by SEM analysis. Results show that austempering heat treatment increases the tensile strength of camshaft as-cast condition. Tensile strength of the cam shaft increases with increasing austenitizing temperature, time and induction hardening. The highest tensile strength 1285 MPa, has been obtained from the induction hardened camshaft austenitized at 900 • C and 90 min time.

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“…Priestner[11] östemperlenmiş KGDD'in nitrürlenmesi sonucu matris sertliğinin 350 HV'ye kadar azaldığını bildirmektedir. Bu çalışmada daha düşük matris sertliği elde edilmesi çift fazlı KGDD'in mikroyapısında sünek ve yumuşak ötektoid öncesi ferritin varlığına atfedilmiştir[17][18][19][20][21]. Nitrürlenmiş çift fazlı KGDD numunenin sertlik profili3.4.…”

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Effect of Nitriding Process on Wear Behavior of Dual Phase (Ferrite+Martensite) Ductile Cast Iron

ERDOĞAN

TOY

KESKİN

et al. 2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Figure. Schemetical representation of the heat treatment routes to produce surface nitrided dual phase ductile cast iron (blue line)Purpose: In this study, it was aimed to improve the surface hardness by applying gas nitriding treatment to dual-phase ductile cast iron and to produce ductile cast irons with a good strengthductility combination. Thus, it has been tried to develop a ductile cast iron with high wear resistance, strength, and ductility.Theory and Methods: Ductile cast iron specimens with a dual-phase microstructure consisting of ferrite + martensite were produced by oil quenching at 70 °C after intercritical austenitizing at 800 ⁰C in the ferrite + austenite zone. Instead of the tempering process, nitriding treatment was applied to the dual-phase ductile cast iron specimens at 560 °C for 540 minutes. Optical microscope and XRD analysis were performed for microstructural characterization of nitrided dual-phase ductile cast iron specimens. The wear properties were tested with a tribometer. Results:In ductile cast iron, microstructures consist of a hard nitride layer (10 µm white layer) on the surface and a ferrite + tempered martensite (43% martensite volume fraction) structure in the center can be produced by oil quenching from intercritical austenitizing and nitriding treatment. Surface hardness of 510 HV in nitrided dual-phase ductile cast iron, 193 HV in dualphase ductile cast iron, and 353 HV in austempered KGDD were obtained. The lowest weight loss and coefficient of friction were obtained in nitrided dual-phase ductile cast iron. The highest weight loss and friction coefficient values with wear were obtained in dual-phase ductile cast iron. Conclusion:It can be concluded that the wear resistance of nitrided dual-phase ductile cast iron is 2 times higher than that of dual-phase ductile cast iron and austempered ductile cast iron.

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Östemperlenmiş Küresel Grafitli Dökme Demirlerde İndüksiyonla Yüzey Sertleştirmenin Yorulma Sınırı Üzerine Etkisi

Cited by 3 publications

References 29 publications

Su Verilmiş AISI 52100 Çeliğinde Metalografik Numune Hazırlama İşlemlerinin Kalıntı Östenit Hacim Oranına Etkisi

Su Verilmiş AISI 52100 Çeliğinde Metalografik Numune Hazırlama İşlemlerinin Kalıntı Östenit Hacim Oranına Etkisi

The Effects of Heat Treatment on the Tensile Properties of Camshaft made of GGG70 Series Spherical Graphite Cast Iron

Effect of Nitriding Process on Wear Behavior of Dual Phase (Ferrite+Martensite) Ductile Cast Iron

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