Transactions of Materials and Heat Treatment

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

Authors： Guo Dongdong Luo Jianbin Zhai Shuji Ma Qingxian

Unit： Tsinghua University Jilin Gongzhuling Economic Development Zone Xintong Mould Limited Company

KeyWords： hot stamping process 38MnB5 forming temperature microstructure mechanical properties

ClassificationCode：TG306

year,vol(issue):pagenumber：2019,44(1):142-150

Abstract：

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.

Funds：

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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