硼钢热冲压产品的力学性能预测模型及U型件验证

Model of Properties Prediction for Boron Steel Hot Stamping Products and Its Validation in a U-Cap Part

针对热冲压成形过程,建立了硼钢微观组织和产品性能预测的模型,分别采用Li模型和K-M模型模拟热冲压过程中的扩散和非扩散型相变;在此基础上,分别采用硬度混合法则、强度经验公式和两相混合表象模型预测最终产品的硬度、强度和延伸率.将上述模型在有限元软件平台LS-DYNA上集成,并模拟了一个U型件的热冲压成形过程.通过U型件的组织含量和力学性能测量值与模拟值对比,证实了所建热冲压产品性能预测模型具有较好的准确性和可靠性.

A microstructure evolution model containing both diffusional phase transformation and non diffu sional phase transformation has been established to describe the ultr-high strength hot stamping process. A series of analytical and empirical models also have been introduced and compared to predict the hardness, strength and elongation of the final hot stamping parts, respectively. The above models were integrated in the commercial finite element analysis codes LS-DYNA, through which a U-cap part for hot stamping process was simulated, and the phase fraction and final mechanical properties were obtained. Experimental measured results show that the simulated values are acceptable and the proposed model is reliable.