Hot compression testing was performed on specimens of an Fe–30Mn–9Al–1Si-0.9C-0.5Mo wt.% low density steel which were extracted from an industrial casting with large grain size (320 ± 50 μm). Grain boundaries act as nucleation sites for dynamic recrystallization in the present material and the large grain size results in fewer nucleation sites, which delays dynamic recrystallization to larger strains and/or higher temperatures and causes higher rates of work hardening relative to similar materials but with smaller grain sizes. A relatively high activation energy for hot deformation of 470 ± 90 kJ mol⁻¹ was determined from a Zener-Hollomon analysis of the flow stresses at different temperatures and strain rates, attributed in part to the large grain size.

对 Fe-30Mn-9Al-1Si-0.9C-0.5Mo wt.% 低密度钢试样进行热压缩试验，该试样从大晶粒尺寸（320 ± 50 μm）的工业铸件中提取。晶界作为现有材料中动态再结晶的成核点，大晶粒尺寸导致成核点较少，这将动态再结晶延迟到更大的应变和/或更高的温度，并导致相对于类似材料但具有较小的加工硬化率更高的加工硬化率颗粒大小。470 ± 90 kJ mol ^-1的相对较高的热变形活化能由对不同温度和应变速率下的流动应力的齐纳-霍洛蒙分析确定，部分归因于大晶粒尺寸。