To investigate the effects of forming parameters on the thermal rheological behavior and microstructure evolution of a 30CrMnSiNi2A ultra-strength steel during thermal plastic deformation, thermal compression tests were carried out under different forming temperatures and strain rates. The microstructure of 30CrMnSiNi2A steel suffered from thermal compression and rapid cooling was composed of lath-shaped martensite, plate-shaped martensite, and retained austenite. The sizes, morphologies, and proportions of those ferrous phases in compressed 30CrMnSiNi2A steel specimens were affected significantly by forming temperatures and strain rates. The effects of forming temperature and strain rate on austenitization and dynamic recrystallization of 30CrMnSiNi2A steel were investigated. Based on the experimental results, the constitutive equation and processing map of 30CrMnSiNi2A steel were established. The unsafe areas of 30CrMnSiNi2A steel were not only distributed in the regions with lower temperature and lower strain rate, but also distributed in the regions with higher temperature and higher strain rate. When thermal processing was conducted at 1050 °C with a strain rate of 0.1 s⁻¹, ideal thermal plastic formability was exhibited by 30CrMnSiNi2A steel.

为了研究成形参数对 30CrMnSiNi2A 超强钢在热塑性变形过程中的热流变行为和组织演变的影响，在不同的成形温度和应变速率下进行了热压缩试验。30CrMnSiNi2A钢受热压缩和急冷的显微组织由板条状马氏体、板状马氏体和残余奥氏体组成。压缩的 30CrMnSiNi2A 钢试样中这些亚铁相的尺寸、形态和比例受成形温度和应变速率的显着影响。研究了成形温度和应变速率对30CrMnSiNi2A钢奥氏体化和动态再结晶的影响。根据实验结果，建立了30CrMnSiNi2A钢的本构方程和加工图。30CrMnSiNi2A钢的不安全区域不仅分布在温度较低、应变率较低的区域，而且还分布在温度较高、应变率较高的区域。当在 1050 °C 下以 0.1 s 的应变速率进行热处理时^-1，理想的热塑性加工性是由30CrMnSiNi2A钢展出。