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| 车用高强钢厚板模内淬火组织演变研究 |
| Microstructure Evolution of Thick Plates of High Strength Steel for Vehicles during In-die Quenching Process |
| Received:May 09, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.09.016 |
| 中文关键词: 高强钢 厚板 热冲压 模内淬火 相变 |
| 英文关键词: high strength steel thick plate hot stamping in-die quenching martensitic transformation |
| 基金项目:湖北隆中实验室自主创新项目(2022ZZ-30);湖北省高等学校优秀中青年科技创新团队计划(T201518);汽车动力传动与电子控制湖北省重点实验室(湖北汽车工业学院)开放基金(ZDK1201601);材料成形与模具技术国家重点实验室开放基金(P2021-023);湖北汽车工业学院新能源汽车关键材料湖北省重点实验室(筹)开放基金(QCCLSZK2021B03，QCCLSZK2021B06);湖北省重点研发计划(2021BAB019) |
| Author Name | Affiliation | | WANG Min | 1. College of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Hubei Xiangyang 441000, China
3. Hubei Key Laboratory of Energy Storage and Power Battery, Hubei Jingmen 448124, China | | XIE Xiao-qing | 1. College of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Hubei Xiangyang 441000, China
3. Hubei Key Laboratory of Energy Storage and Power Battery, Hubei Jingmen 448124, China | | CHEN Rong-chuang | 1. College of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Hubei Xiangyang 441000, China
3. Hubei Key Laboratory of Energy Storage and Power Battery, Hubei Jingmen 448124, China | | LIU Xian-long | 1. College of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Hubei Xiangyang 441000, China
3. Hubei Key Laboratory of Energy Storage and Power Battery, Hubei Jingmen 448124, China | | LI Bing | 1. College of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China
2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Hubei Xiangyang 441000, China
3. Hubei Key Laboratory of Energy Storage and Power Battery, Hubei Jingmen 448124, China |
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| 中文摘要: |
| 目的 揭示高强钢厚板在热冲压模内淬火过程中的马氏体组织演变特征和规律。方法 建立了6 mm厚硼钢板热冲压模内淬火过程马氏体相变有限元预测模型，分析了马氏体分布情况及演变特征，阐明了保压力等关键淬火参数对组织演变的影响规律。结果 沿板面方向，马氏体从角部开始转化，逐渐由边缘向内部扩展，呈现出“边缘高、中部低”的分布特征。沿板厚方向，马氏体呈现出“表层高、心部低”的分布特征;随淬火过程的进行，这种厚向梯度分布特征逐渐弱化。与薄板相比，厚板的马氏体相变启动和结束时刻均较晚，且马氏体转化率明显较低，马氏体沿厚向分布的不均匀性也更明显。随保压力的增大，马氏体转化结束时刻前移，马氏体转化率增大且沿厚向分布更均匀，抗拉强度增大，延伸率减小;当保压力超过40 MPa时，上述影响逐渐减弱。结论 与薄板相比，厚板组织沿板面和板厚方向均呈现更明显的梯度分布特征。保压力对厚板组织演变和力学性能有较大影响，但这种影响随保压力的增大而逐渐减弱。 |
| 英文摘要: |
| The work aims to reveal the characteristics and laws of martensite evolution during the in-die quenching process of hot stamping for thick plates of high-strength steel. A finite element prediction model of martensitic transformation during in-die quenching of hot stamping of 6 mm thick boron steel plates was established, the martensite distribution and evolution characteristics were analyzed, and the effect of key quenching parameters such as holding pressure on the microstructure evolution was clarified. The results showed that along the direction of the plate surface, the martensite transformation started from the corner and gradually expanded from the edge to the inside, showing the distribution characteristics of "high at the edge and low in the middle". Along the plate thickness direction, martensite showed the distribution characteristic of "high at the surface and low at the core", which was gradually weakened as the quenching process proceeded. Compared with thin plates, the start and end of the martensitic transformation of thick plates were late, and the martensite conversion rate was significantly lower than that of thin plates, and the inhomogeneity of the martensite distribution along the thickness direction was more obvious. With the increase of holding pressure, the end time of martensite transformation was shortened, the martensite transformation rate increased, and the distribution of martensite along the thick direction was more uniform; the tensile strength increased and the elongation decreased. When the holding pressure exceeded 40 MPa, the above trend gradually decreased. In summary, compared with thin plates, thick plates show a more obvious gradient distribution along the plate surface and plate thickness directions. The holding pressure has a strong effect on the microstructure evolution and mechanical properties of thick plates, but this effect gradually decreases with the increase of holding pressure. |
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