Precipitation of Fine Carbides, Transformation of the Retained Austenite and Corrosion Properties on EN-31 Steel by Cryogenic Treatment Process

Asian Review of Mechanical Engineering Pub Date : 2022-06-10 DOI:10.51983/arme-2022.11.1.3287

R. Sri Siva, M. Shunmuga Priyan

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Abstract

Investigate of precipitation carbides transformation of the retained austenite and corrosion properties on EN-31 steel by cryogenic treatment method. In this work to identify the percentage of retained austenite and corrosion rate, was presented on EN 31 bearing steel by which cryogenic treatment process. Further, the hardness values of CHT and DCT were compared by using the microstructure view of the CHT and DCT samples. The optimized cryotreated samples were prepared for metallographic examination as per ASTM E3-01. Then the specimen was subjected to factor level setting like cooling rate, soaking period, soaking temperature and tempering temperature at various conditions. Moreover, the precipitation of fine carbides and the transformation of retained austenite to martensite showed considerable variations in the hardness of the optimized DCT samples compared to the CHT samples. The mean hardness value of this sample is 861HV and 19.20%, 847HV and 17.25%, 838HV and 17.10%, 857HV and 18.40%, 790HV and 13.45% improvement in the hardness compared to CHT.

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EN-31钢低温处理过程中细小碳化物的析出、残余奥氏体的转变及腐蚀性能

研究了EN-31钢低温处理后残余奥氏体析出碳化物、相变及腐蚀性能。在本工作中，确定了残余奥氏体的百分比和腐蚀速率，提出了对en31轴承钢进行低温处理的工艺。此外，通过对CHT和DCT样品的微观结构观察，比较了CHT和DCT的硬度值。根据ASTM E3-01制备优化后的冷冻样品进行金相检验。然后对不同条件下的冷却速率、浸泡时间、浸泡温度和回火温度进行因子水平设置。此外，优化后的DCT样品的硬度与CHT样品相比，细小碳化物的析出和残余奥氏体向马氏体的转变也有很大差异。该样品的硬度平均值为861HV，比CHT提高19.20%，847HV提高17.25%，838HV提高17.10%，857HV提高18.40%，790HV提高13.45%。

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Asian Review of Mechanical Engineering

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