中碳钢温变形过程的流变应力

Flow stress of medium carbon steel under warm compression deformation

为了制定中碳钢温轧工艺,利用Gleeble-3500热模拟试验机对中碳钢进行温压缩试验,研究其在不同变形温度(550～700℃)和应变速率(0.001～10s-1)下的流变行为,讨论温变形过程流变应力的影响因素。研究结果表明:中碳钢温变形过程由铁素体动态回复、铁素体动态再结晶、渗碳体球化和稳态变形4个阶段构成,其软化机理主要有铁素体动态再结晶和珠光体动态球化。

In order to design the warm rolling process of medium carbon steel, flow stress under warm compression deformation was investigated by experiments. The experiments were carried out on a Gleeble- 3500 thermal simulation machine at temperature of 550-00 ℃with constant strain rates 0. 001 -s-1. The influence factors in warm deformation were studied. Results show that the stress-strain curve of medium carbon steel under warm deformation is composed of four stages： the ferrite dynamic recovery, ferrite dynamic recrystallization, cementite spheroidization, and steady deformation state. The main soften mechanisms are ferrite dynamic recrystallization and pearlite dynamic spheroidization.