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铁素体-贝氏体双相组织钢能够通过软硬相协调屈服抵抗大变形,这是基于应变设计管线钢的研究热点。为探究生产工艺对双相组织形态的影响规律,利用Gleeble-3800热模拟试验机,通过压缩试验模拟轧制和冷却,研究了两阶段冷却工艺对基于应变设计X70管线钢形变奥氏体组织转变的影响。结果表明:一阶段缓冷后的待温处理使铁素体形核温度降低,有效提高了铁素体形核率,起到细化晶粒作用;降低二阶段快冷开冷温度可以增加铁素体析出时间,从而增加铁素体的含量;二阶段快冷中,提高冷却速率和降低终冷温度均可细化贝氏体组织的板条间距以及板条间的碳化物,提高了贝氏体显微维氏硬度。
Ferrite - bainitic dual phase steel can be controlled by the hard and soft phase to yield a large deformation resistance, which is based on strain of the design of pipeline steel research hot spots. In order to explore the influence of production process on the morphology of bimetallic microstructure, the Gleeble-3800 thermal simulation test machine was used to simulate rolling and cooling by compression test. The effect of two-stage cooling process on deformation of austenite microstructure of X70 pipeline based on strain was studied Impact. The results show that the temperature of ferrite nucleation decreases after one-stage slow cooling and the nucleation rate of ferrite can be effectively increased, which can refine grains. Decreasing the rapid cooling and cooling temperature in two stages can increase the ferrite Precipitation time, thereby increasing the content of ferrite; two fast cooling, cooling rate and lower the final cooling temperature can refine the microstructure of the bainite lath spacing and the carbide between the lath, raising the bainite Micro Vickers hardness.