Effect of Heat Treatment on the Impact Toughness of ‘High-Chromium Cast Iron – Low Alloy Steel’ Bimetal Components

Özdemir, Zafer

doi:10.1007/s11041-017-0088-y

Cited by 6 publications

(6 citation statements)

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“…A schematic view of bimetal casting process. 28 and 4. In the area of usage, HCCI part is the working part (harder) and LCCS is the backup part (tougher).…”

Section: Charpy Impact Testsmentioning

confidence: 99%

“…26 Xiao-Hui Lu and colleagues investigated the effects of subzero celsius treatment of retained austenite in bearing steel and results showed that the activation energy of retained austenite decomposition slightly increased through subzero celsius treatment and tempering. 27 Effect of heat treatment on the bimetallic plates has been investigated by O ¨zdemir 28 and also by Hao Li and colleagues; 29 both investigations presented significant results in terms of hardness, toughness, and good interface. Some significant studies based on high-chromium cast iron/ steel and MC (Cr-Fe Carbon) carbides are mentioned below:…”

Section: Introductionmentioning

confidence: 98%

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Shallow Cryogenic Treatment (SCT) Effects on the Mechanical Properties of High Cr Cast Iron: Low-Carbon Cast Steel Bimetallic Casting

Özdemir

2020

Inter Metalcast

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The shallow cryogenic (subzero) treatment (SCT) effect on the mechanical properties of the bimetallic casting used in the crushing industry has been investigated. Examination methods include sand casting, heat treatment and SCT, Charpy impact test, optical microscope, scanning electron microscope, microanalysis of the chemical composition (energy dispersive spectroscopy-EDS), x-ray diffraction, and hardness measurement. Two bimetallic castings (single casting containing two layers, one of low-carbon cast steel-LCCS-back up part and other high Cr cast iron-HCCIworking part) have been prepared by the sand casting method. They have been subjected to diffusion annealing at 1040 °C for 5 h. One of them was quenched in pressurized air till 100 °C and was tempered at 270 °C for 3 h and, and the other one has been subjected to SCT at -84 °C for 24 h and then tempered at 270 °C for 3 h. The impact toughness values before and after SCT are determined five Charpy specimens per point. Hardness values and metallography of samples have been analyzed and compared. A remarkable change was observed in hardness and impact energy/toughness before and after SCT.

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“…A schematic view of bimetal casting process. 28 and 4. In the area of usage, HCCI part is the working part (harder) and LCCS is the backup part (tougher).…”

Section: Charpy Impact Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Shallow Cryogenic Treatment (SCT) Effects on the Mechanical Properties of High Cr Cast Iron: Low-Carbon Cast Steel Bimetallic Casting

Özdemir

2020

Inter Metalcast

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“…Sertlik oranları numunelerin 3 farklı noktasından Rockwell C olarak alınmıştır [15]. DKİ ve DKİ+Temperleme sonrasında sertlik değerlerinin ve tokluk değerlerinin eş zamanlı olarak arttığı (Şekil 11) gözlemlenmiştir [8,9].…”

Section: Sertlikunclassified

“…Bu özellikler aşınma direnci ve darbe dayanımı için çok önemlidir [7]. Konvansiyonel ısıl işlem prosesi, sığ kriyojenik işlem ve bimetallerin mekanik özellikleri daha önceki çalışmalarında Z.Özdemir tarafından incelenmiştir [8,9]. Bugüne kadar bimetallerin kriyojenik işlemi üzerine yapılan bazı önemli çalışmalar aşağıda belirtilmiştir.…”

Section: Introductionunclassified

Derin Sıfıraltı Isıl İşlemin Bimetallerin Bazı Mekanik Özelliklerine Etkisi

Özdemir

2024

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Bu çalışmada kırıcı sanayiinde kullanılan bimetallerin mekanik özelliklerine derin sıfır altı-kriyojenik işlemin (DKİ) etkisi incelenmiştir. Son yıllarda yüksek sertliğin yanısıra yüksek tokluk ihtiyacının da olduğu darbeli kırıcılarda bimetal kompozitler yüksek manganlı östenitik çeliklerin yerine yaygın olarak kullanılmaya başlanmıştır. Konvensiyonel ısıl işlem bimetallerde uygulanmakla beraber, çalışmamızda sıfıraltı işlemin malzemenin belirli mekanik özelliklerine etkisi ve içyapı analizi de incelenmiştir. İnceleme 800°C de tavlama, -180°C de derin sıfır altı işlem 250°C de temperleme, charpy darbe testi, optik mikroskop analizi, tarayıcı elektron mikroskop analizi, X-Ray analizini ve sertlik ölçümlerini içermektedir. Her sette 5 adet deney numunesi olmak üzere 2’şer set bimetal malzeme önce 5 saat süre ile tavlama işlemine tabii tutulmuş, ardından 24 saat sıfır altı işleme ve 3-4 saat süre ile de temperleme işlemine tabii tutulmuştur. Darbe tokluk deneyleri ve sertlik ölçümleri yapılarak karşılaştırılmıştır. Sonuç olarak derin sıfır altı işlem sonrası tokluk ve sertlik değerlerinde önemli değişimlerin ortaya çıktığı görülmekte olup, aynı zamanda temiz bir içyapı ve homojen bir bileşimin ortaya çıktığı gözlemlenmiştir. Derin Sıfıraltı İşlem+Temperleme sonrası numunelerin darbe tokluğunun sadece Derin Sıfıraltı İşlemi sonrasına kıyasla ortalama %20 arttığı ve sertlik oranlarının ise %10 azaldığı gözlemlenmiştir.

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“…Employing a design of experiments (DOE), the aim of this paper is to identify those manufacturing factors involved in the manufacture of the shell that might have a significant effect on the quality of the shell-core interface. The impact toughness test is a reliable test method for assessing the quality of this bi-metal bond [26,27,28]. The analyzed factors were: The use of FeSi alloy inoculants with traces of lanthanum; inoculation with different percentages of SiCaMn, FeB, and Mg; the percentage of Si; and the liquidus temperature.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Quality of the Shell-Core Bond Interface in Duplex Work Rolls Manufactured by Centrifugal Casting Used in Hot Strip Mills

2019

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To ensure the formation of a sound shell-core bond interface free of defects between the shell and the core in work rolls used in the finishing stands of hot strip mills, a complete fusion of this interface must be achieved, avoiding excessive mixing of the two components and the formation of hard, fragile microstructures. The shell is made of white cast iron, alloyed with Ni and Cr, and the core is manufactured of grey cast iron spheroidal graphite in a pearlitic matrix. It is thus advisable to inoculate the shell with 0.6 kg/T SiCaMn, as this promotes discontinuity in the carbide network and leads to an increase in the impact toughness of the bond interface. Furthermore, inoculation of the shell with FeSi-La should be avoided, as this inoculant leads to an increase in graphite counts, promoting it with a lamellar morphology at the edge of the bond and hence reducing the impact toughness in this interface. Addition of Mg to the shell has been found to produce an increase in hardness in the regions adjacent to the bond interface.

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Effect of Heat Treatment on the Impact Toughness of ‘High-Chromium Cast Iron – Low Alloy Steel’ Bimetal Components

Cited by 6 publications

References 1 publication

Shallow Cryogenic Treatment (SCT) Effects on the Mechanical Properties of High Cr Cast Iron: Low-Carbon Cast Steel Bimetallic Casting

Shallow Cryogenic Treatment (SCT) Effects on the Mechanical Properties of High Cr Cast Iron: Low-Carbon Cast Steel Bimetallic Casting

Derin Sıfıraltı Isıl İşlemin Bimetallerin Bazı Mekanik Özelliklerine Etkisi

Enhancement of the Quality of the Shell-Core Bond Interface in Duplex Work Rolls Manufactured by Centrifugal Casting Used in Hot Strip Mills

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