Structure Refinement of Spring Steel 51Crv4 after Accelerated Spheroidisation

Hauserova, Daniela; Dlouhý, Jaromír; Kotous, Jakub

doi:10.1515/amm-2017-0228

Cited by 7 publications

(3 citation statements)

References 8 publications

(8 reference statements)

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“…Spheroidization based on the cycling of fast induction heating with DET effect is a key part of technology "Accelerated Spheroidization and Refinement". This ASR process leads to a spheroidized structure in minutes [15,16]. The other way to rapidly accelerated spheroidization ASR is based on thermomechanical treatment [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural State prior Quenching in Spring Steel

Kotous¹,

Salvetr²

2023

Manufacturing Technology

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Various structure states before quenching significantly influence final mechanical properties as well as the dispersion of chemical composition at the same steel grade. Therefore heat treatment with mechanical properties is specified in the technical delivery conditions. Even if the heat treatment is determined, different mechanical properties can be achieved. These differences are increasing in importance in high-strength applications like springs, cutting tools, safety, and load-bearing parts of automotive design ect. Because it has a direct impact on their lifetime. The structure consists of ferrite and cementite after spheroidization annealing prior quenching process. The cementite could be observed in various shapes, e.g. fine and large globular particles or the rest of the disintegrated lamellar shape. This article shows how these cementite morphologies affect the quenching behavior and final mechanical properties in high-strength spring steel 54SiCr6. Accelerated Spheroidization, ASR Quenching Spring steel 54SiCr6.

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Section: Introductionmentioning

confidence: 99%

Influence of Structural State prior Quenching in Spring Steel

Kotous¹,

Salvetr²

2023

Manufacturing Technology

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“…The present work performed soaking, quenching, and tempering on 51CrV4 steel since this kind of heat treatment is a conventional manufacturing route to improve its mechanical properties. Previous researchers have studied the effects of various parameters during heat treatment on the microstructure and mechanical properties of 51CrV4 steels [3,[19][20][21]. However, very few researches have focused on the detailed quenching conditions such as the oil-bath temperature and the out-of-oil workpiece temperature, which is essential to obtain the required strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Quenching Conditions on the Microstructure and Mechanical Properties of 51CrV4 Spring Steel

Zhang

Gong

et al. 2018

Metals

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51CrV4 steel is extensively used in large-size damping springs for trains and vehicles. Quenching conditions play an important role in performance enhancement. The present work investigated the effects of various oil-bath temperatures and out-of-oil temperatures on the microstructure and the mechanical properties of this steel. The morphological examination focused on both the quenched martensite and the tempered troostite. Tensile and hardness tests were carried out to evaluate the mechanical properties. The results showed that a coarsening of the martensite occurred at a high oil-bath temperature. In addition, the size and fraction of bainite islands also increased with the increase of oil-bath temperature. In contrast, the carbide size and the intercarbide spacing both increased with the increase of oil-bath temperature. Thus, the tensile strength and the hardness both decreased with increasing oil-bath temperature in accordance with the Hall-Petch relationship. Correspondingly, the ductility increased as the oil-bath temperature increased. At a relatively high out-of-oil temperature, the martensite underwent an auto-tempering process, which led to the precipitation of many tiny carbide particles in the as-quenched martensite laths. This auto-tempering effect enhanced the width of large-sized carbides and reduced their length in the final microstructure. The intercarbide spacings increased with increasing out-of-oil temperature. As the oil-bath temperature increased, the tensile strength and hardness decreased, and the ductility increased. The fracture morphology was examined to explain the results of mechanical properties.

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“…51CrV4 malzemelerinin mikroyapı ve Şekil 3'te verilen SEM görüntüleri incelendiğinde menevişleme sıcaklığının artması ile karbür artışı meydana gelmiş ve karbürler ferrit içerisinde dağılmış şekilde olduğu görülmektedir. Sıcaklığın artışı ile bu çeliklerde beynit ve martenzit yapıların arttığı bilinmektedir[15]. Bu yapılar 315 °C sıcaklıkta meneviş işlemi uygulanan Şekil 2.b ve 3.b'de gözlemlenen yapılar ile uyumluluk göstermektedir.…”

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FARKLI MENEVİŞLEME SICAKLIKLARININ 51CrV4 ÇELİĞİNİN MEKANİK ÖZELLİKLERİNE ETKİLERİNİN İNCELENMESİ

Durmuş

Çakir

Gül

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, samples of 51CrV4 steel tempered at two different temperatures after annealing and oil cooling were examined. The changes in the morphology and mechanical properties of the samples processed at different temperatures were analyzed. The effects of tempering on wear resistance were discussed. Figure A. Schematic representation of experimental studies Purpose: The aim of the study is to discuss and compare the effects of different tempering temperatures on microstructure and mechanical properties. Theory and Methods: Samples of 51CrV4 steel were annealed at 970 °C and oil cooled. Then, they were tempered at 220 °C and 315 °C and examined. Microstructures and morphological changes of steel samples were examined using optical microscope, SEM-EDS and XRD. Changes in mechanical properties were examined by tensile, charpy impact and dry sand rubber wheel abrasion tests. Results: Results show that two different microstructures consisting of carbide sediments in the ferritic matrix and containing a bainitic structure were reached. No significant difference was observed in the hardness measurements taken from the section and the surface. However, as a result of the tensile, charpy impact, and dry sand rubber wheel abrasion tests, significant differences were observed between the sample groups and it was concluded that the most suitable tempering temperature was 315 °C. Conclusion: 51CrV4 steel were tempered at two different temperatures after annealing and oil cooling and examined in this study. The changes in the morphology and mechanical properties of the samples processed at different temperatures were analyzed and presented.

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Structure Refinement of Spring Steel 51Crv4 after Accelerated Spheroidisation

Cited by 7 publications

References 8 publications

Influence of Structural State prior Quenching in Spring Steel

Influence of Structural State prior Quenching in Spring Steel

Effect of Quenching Conditions on the Microstructure and Mechanical Properties of 51CrV4 Spring Steel

FARKLI MENEVİŞLEME SICAKLIKLARININ 51CrV4 ÇELİĞİNİN MEKANİK ÖZELLİKLERİNE ETKİLERİNİN İNCELENMESİ

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