通过Gleeble模拟双道次压缩变形后的连续冷却转变过程,研究了未再结晶区变形对X80级管线钢相变及组织的影响。试样在未再结晶区以不同变形量变形并以一定冷速冷却,记录冷却过程中膨胀量变化曲线,对试样进行微观组织观察和显微硬度测试。结果表明:在试验条件下,X80管线钢双道次变形后显微组织主要由针状铁素体和低碳贝氏体等构成;变形提高了试验钢相变温度,当变形量从0%增加到40%时,相变开始温度提高35℃;变形促进了针状铁素体转变,抑制了粗大粒状贝氏体组织形成,明显细化了组织;采用双道次控轧,在一定冷速及压下量配合下可获得以针状铁素体为主的组织。 Gleeble simulates the continuous cooling transformation process after double-pass compression deformation, and studies the effect of the non-recrystallization zone deformation on the phase transformation and microstructure of X80 pipeline steel. The samples were deformed at different deformations in the non-recrystallized zone and cooled at a certain cooling rate. The curve of the expansion during cooling was recorded. The microstructure and microhardness of the samples were observed. The results show that under the test conditions, the microstructure of X80 pipeline steel is mainly composed of acicular ferrite and low carbon bainite after double pass deformation. The deformation increases the phase transition temperature of the test steel. When the deformation is from 0% Increasing to 40%, the transformation start temperature increased by 35 ℃. Deformation promoted the transformation of acicular ferrite, inhibited the formation of coarse granular bainite and remarkably refined the microstructure. With double pass controlled rolling, Speed ​​and reduction with the amount of acicular ferrite can be obtained under the organization.