X70HD管线钢形变诱导铁素体相变关键参数

发布时间：2018-05-28 11:31

本文选题：热膨胀 + 变形温度　；参考：《中南大学学报(自然科学版)》2017年04期

【摘要】：采用热膨胀法对X70HD(抗大变形)管线钢在特定条件下铁素体的静态相变点以及动态相变点进行测定。以测得的相变点为依据,制定两阶段累积变形量高达80%的热模拟实验。通过固定第一阶段变形参数,变化第二阶段变形过程中的变形温度以及应变速率,随后马上淬火,分析第二阶段变形温度与应变速率这2个因素对形变诱导铁素体生成量以及铁素体晶粒粒径的影响。研究结果表明:所获得的形变诱导铁素体为等轴铁素体,并且该等轴铁素体晶粒细小;第二阶段变形在奥氏体低温区时,应变速率越低越有利于形变诱导铁素体的生成;在奥氏体非再结晶区的较高温度范围内,应变速率越高越有利于形变诱导铁素体的生成。
[Abstract]:The thermal expansion method is used to determine the static phase transition point and dynamic phase transition point of ferrite in X70HD (large deformation) pipeline steel under specific conditions. Based on the measured phase transition point, the thermal simulation experiment with two stages of cumulative deformation up to 80% is made. By fixing the first stage deformation parameters, the deformation temperature in the second stage deformation process is changed. Degree and strain rate, then quench immediately, analyze the influence of the 2 factors of second stage deformation temperature and strain rate on the formation of ferrite and grain size of ferrite. The results show that the obtained deformation induced ferrite is an equiaxed ferrite, and the grain of the equiaxed ferrite is fine; the second stage deformation is at the same time. The lower the strain rate is, the lower the strain rate is, the higher the deformation induced ferrite formation. The higher the strain rate is, the higher the strain rate is in the non recrystallized austenite region, which is beneficial to the formation of the deformable ferrite.
【作者单位】：燕山大学国家冷轧板带装备及工艺工程技术研究中心;
【基金】：国家自然科学基金资助项目(51304171) 河北省自然科学基金资助项目(E2013203248) 人力资源和社会保障部留学人员科技活动项目(CG2016003001)~~
【分类号】：TG142.1

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