1、2200 英文单词，英文单词，1.2 万英文字符万英文字符，中文，中文 3600 字字 文献出处文献出处: Ganapathy M, Li N, Lin J, et al. Investigation of a new hot stamping process with improved formability and productivityJ. Procedia engineering, 2017, 207: 771-776. Investigation of a new hot stamping process with improved formability and producti
2、vity M. Ganapathy, N. Li, J. Lin, D. Bhattacharjee Abstract In order to improve the drawability of boron steel and also to increase the productivity of hot stamping process, a new hot stamping process with pre-cooling has been proposed. Stress-strain behavior at various temperatures was investigated
3、 and compared with that in traditional hot stamping processes. Detailed studies were carried out on the strain hardening parameter, n, at different temperatures and deformation rates. To evaluate this concept, hot stamping experiments were performed with both conventional (without pre-cooling) and n
4、ew process (with pre-cooling) for a scaled down B-Pillar automotive component. The new hot stamping process with pre-cooling was able to produce the B-Pillar at low temperature (500 ) with less thinning than the hot stamping carried out without precooling at high temperature (765 ). Also the in-die
5、quenching time was reduced by about 60%, by adopting the new hot stamping process with pre-cooling, which would increase the productivity significantly for automotive mass production without compromising the part quality. Keywords: Hot stamping; Improved hot stamping; Boron steel; strain hardening.
6、1. Introduction A typical hot stamping process of a press hardening steel is described in Fig. 1(a). The process begins with steel containing ferrite and pearlite microstructure with tensile strength of approximately 600 MPa. The material is heated to above austenite temperature, usually about 900 and kept in furnace for a few minutes to get complete austenite phase. The austenized material blank is quickly transferred from the furnace to the stamping tool and deformed into the required sh
