Transactions of Materials and Heat Treatment

Title：Influence of pre-processing technology on microstructure and mechanical properties of medium carbon steel

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ClassificationCode：TG142

year,vol(issue):pagenumber：2025,50(8):168-176

Abstract：

To further optimize the strength-plasticity matching of plain carbon steel, medium carbon pseudo-eutectoid steels with different contents of proeutectoid ferrite were obtained by adjusting the pre-processing technology, Which was subjected to warm rolling at 500 ℃. The results show that the experimental steel with a lower proeutectoid ferrite content exhibited a higher proportion of ultra-fine grained ferrite after warm rolling. Furthermore, combined with partially banded coarse-grained ferrite, lamellar cementite was finer and demonstrated excellent comprehensive mechanical properties with the tensile strength of 1399 MPa, the yield strength of 1362 MPa, the uniform elongation of 4.5%, the total elongation of 5.2%, and the strength-plasticity product of 7274.8 MPa·%.The analysis of strain field evolution shows that the experimental steel with a higher proportion of ultra-fine grains has a more uniform strain field distribution, which is the key to form good strain hardening ability.

Funds：

国家自然科学基金资助项目（51974134）；河北省创新能力提升计划项目（24461002D）

作者简介：孙倩（1999-），女，硕士研究生 E-mail：sunqian34@163.com 通信作者：刘国龙（1990-），男，博士，讲师 E-mail：lgl_1990@163.com

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