The influences of hot deformation parameters on pearlite grain nucleation and growth during austenite-pearlite phase transformation in a steel wire rod have been investigated through quantitative analysis of microstructure parameters such as austenite grain size, ferrite grain size, pearlite colony size, and lamellar spacing. During hot deformation, the austenite grain size decreases due to recrystallization, providing extra nucleation sites for pearlite phase transformation, which decreases the ferrite grain size and pearlite colony size. Moreover, the stored strain energy in undercooled austenite accelerates carbon diffusion during pearlite phase transformation, which facilitates ferrite grain growth and increases pearlite colony size. Consequently, the competing influence of recrystallization and strain energy provides flexibility in adjusting ferrite grain size and colony size by hot deformation. This study highlights the critical role of hot deformation in determining the microstructure of pearlitic steel.

通过对奥氏体晶粒尺寸、铁素体晶粒尺寸、珠光体团尺寸和片层间距等显微组织参数的定量分析，研究了热变形参数对钢盘条奥氏体-珠光体相变过程中珠光体晶粒形核和长大的影响。热变形过程中，奥氏体晶粒尺寸因再结晶而减小，为珠光体相变提供了额外的形核位点，从而减小了铁素体晶粒尺寸和珠光体团尺寸。此外，过冷奥氏体中储存的应变能加速珠光体相变过程中的碳扩散，从而促进铁素体晶粒长大并增加珠光体团尺寸。因此，再结晶和应变能的竞争影响为通过热变形调节铁素体晶粒尺寸和团尺寸提供了灵活性。这项研究强调了热变形在确定珠光体钢微观结构中的关键作用。