锻压技术

38MnB5热轧钢板热成形温度参数与力学性能探索

英文标题：Exploration of hot stamping heating parameters and mechanical properties for 38MnB5 hot-rolled steel plate

作者：郭冬冬骆建彬翟述基马庆贤

分类号：TG306

出版年,卷(期):页码：2019,44(1):142-150

摘要：

装甲车辆的轻量化发展对高强钢的成形工艺和材料性能提出了更高的要求，为提升材料的装甲防护性能，以8 mm厚38MnB5热轧钢板为研究对象，对不同加热温度和保温时间条件下的微观组织、晶粒尺寸进行研究，以得到合理的热成形温度参数，并通过室温拉伸、冲击及穿甲破坏试验对材料的相关性能进行检测和分析。结果表明：加热温度950 ℃、保温12 min为试验材料合理的热成形温度参数，在此条件下组织完全奥氏体化，晶粒尺寸基本一致、分布均匀；在选定参数条件下，材料水淬后的塑性、韧性极差，晶间脆性严重；采用通有冷却水的平整模具进行热成形试验，得到钢板的抗拉强度为1925 MPa，断后伸长率为9.1%，表面硬度为52 HRC，塑性、冲击韧性有了较大改善，射击试验弹坑深度在2~3 mm，钢板弹坑背面平整，无明显凸起，抗弹性能较好。

The lightweight development of military armored vehicles puts forward higher requirements for the forming process and material properties of high strength steel. In order to improve the armor protection performance of materials, the microstructure and grain size of 38MnB5 hotrolled steel plate with 8 mm thickness were studied under different heating temperatures and holding times to obtain suitable hot stamping heating parameters, and the mechanical properties of material were tested and analyzed by tensile, impact and armor piercing tests at room temperature. The results show that the suitable hot stamping heating temperature is 950 ℃, and the holding time is 12 min. Under this condition, the austenite transformation is complete, and the grain size is basically the same and evenly distributed. However, after water quenching, the plasticity and toughness of material are very poor, and the intergranular brittleness is serious. Furthermore, the hot stamping test is conducted by a flat die with cooling water, the tensile strength of the obtained steel plate is 1925 MPa, the elongation is 9.1%, the surface hardness is 52 HRC, and the plasticity and impact toughness are greatly improved. In the armor piercing failure test, the craters depths are 2-3 mm, and the back of craters on steel plate is flat without obvious protrusion which proves good bulletproof performance.

基金项目：

国家自然科学基金资助项目（51775298）

郭冬冬（1991-），男，硕士研究生，E-mail：gdd16@139.com；通讯作者：马庆贤(1964-),男，博士，教授，E-mail：maqxdme@mail.tsinghua.edu.cn

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