Stamping Boron Steel Research Articles

Experimental and Simulation Study for Heat Transfer Coefficient in Hot Stamping of High-Strength Boron Steel

An optimization-based numerical procedure was developed to determine the pressure-dependent heat transfer coefficient (HTC) between the blank and tools during the hot stamping of boron steel. During the quenching period, HTC increased with the contact pressure between blank and lower tool. There is no obvious linear relationship between them. The maximum value of 1500 W/m2 K was achieved at contact pressure 18 MPa.

Optimization of Heat Treatment Parameters of Boron Steel B1500HS Using Response Surface Methodology

Heat treatment parameters play important roles in hot stamping of boron steel. In order to optimize the heat treatment parameters of boron steel B1500HS, aResponse Surface Methodology (RSM) with two-factor and five-level experimental project is used, and austenitizing temperature and holding time are the two factors in the experimental project. The heat treatment experiments are performed according to the designed results. The hardness, tensile strength, and ductility of cooled specimens are measured using the Rockwell hardness tester and the tensile testing machine. According to the measuring results and experimental project, the cubic response surface models of hardness, tensile strength, and ductility are gained using the regression method. The austenitizing temperature and holding time are optimized according to the cubic response surface model. The results of parameter optimization show that, when the austenitizing temperature is in the range of 916°C–921°C and holding time is 0 min, with steel die cooling, the cooled parts of B1500HS have the properties of high tensile strength, good abrasion resistance, and energy absorption performance.