锻压技术

预处理工艺对中碳钢组织及力学性能的影响

英文标题：Influence of pre-processing technology on microstructure and mechanical properties of medium carbon steel

作者：孙倩刘国龙杨明维张馨月冯运莉

分类号：TG142

出版年,卷(期):页码：2025,50(8):168-176

摘要：

为进一步优化普碳钢的强塑性匹配，结果发现，通过调整预处理工艺，获得了具有不同先共析铁素体含量的中碳伪共析钢，并在500 ℃下对其进行温轧。先共析铁素体含量较低的实验钢在温轧后具有较高的铁素体超细晶比例，其渗碳体片层更细，配合部分条带状粗晶铁素体，表现出良好的综合力学性能，其抗拉强度为1399 MPa、屈服强度为1362 MPa、均匀伸长率为4.5%、总伸长率为5.2%、强塑积为7274.8 MPa·%。通过分析应变场演变发现，超细晶比例较高的实验钢的应变场分布更加均匀，是形成良好应变硬化能力的关键。

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.

基金项目：

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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