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

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Abstract

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-HCCI-working 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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Notes

  1. Because of the being a trade secret of casting company, not so many details could be given about the activator.

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Acknowledgements

I am very grateful to the Ti-Hi Textile Co. (Babaeski/Turkey) esp. Chief Eng. Emre ÖZKAN for helping and guiding us at conducting HT and SCT and make time for measuring hardness values, Cemre Casting Diyarbakır/Turkey for helping and guiding us at manufacturing test samples and conducting heat treatments esp. Chief Eng. İsmail AVCU, Duduoğlu Casting Çorum/Turkey for conducting OMs, Hitit University Eğitim Araştırma Hitit University Science and Technology Research Center (Çorum/Turkey) for helping and guiding us at conducting SEM and EDS analysis and Trakya University Technological Research Center (Edirne/Turkey) for helping and guiding us at conducting X-Ray and charpy impact tests.

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  1. Department of Mechanical Engineering, Gazi University, 06100, Ankara, Turkey

    Zafer Özdemir

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Correspondence to Zafer Özdemir.

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Özdemir, Z. Shallow Cryogenic Treatment (SCT) Effects on the Mechanical Properties of High Cr Cast Iron: Low-Carbon Cast Steel Bimetallic Casting. Inter Metalcast 15, 952–961 (2021). https://doi.org/10.1007/s40962-020-00532-0

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