加氢反应器筒节材料动态再结晶临界条件

Dynamic Recrystallization Critical Conditions of Hydrogenation Reactor Heavy Cylinder Manufactured with Alloy Steel

基于Gleeble-3500热模拟试验机,在变形温度1000～1200℃,变形速率0.001～1s-1条件下,对加氢反应器筒节材料进行单道次热压缩试验,并以测得的应力-应变数据为基础,计算加工硬化率θ。利用lnθ-ε曲线的拐点特征,研究实验钢热变形过程中的动态再结晶临界条件,计算各变形条件下的临界应变值。引入温度补偿应变速率因子即Zener-Hollomon参数,确定了变性条件与临界应变εc的定量关系。结果表明:随应变速率的减小和变形温度的升高,临界应变逐渐减小;临界应变预测模型可表示为εc=1.716×10-3Z0.216 18。

The true stress-true strain curves of hydrogenation reactor heavy cylinder manufactured with 2.25Crl Mo0.25V alloy steel were achieved by a series of isothermal compression test on Gleeble-3500 thermal simulator at 1000 -1200 ℃under the strain rate of 0.001-1s-1 Based on the experimental data of stress-strain, the critical conditions of dynamic recrystallization were researched by the computation of the work hardening rate θ and characteristics of the inflection point of lnθ-ε curves. The quantitative relationship between deformation condition and critical strain was obtained by introducing Zener-Hollomon parameters. The results indicate that the critical strain becomes smaller with the strain rate decreasing and temperature increasing and the predicting model of the critical strain can be written as： εc= 1.716×10-3Z0.21618.