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以P110钢级石油套管30Mn Cr22为研究对象,采用Gleeble-1500D热模拟实验机进行多道次热压缩实验,模拟其PQF轧管生产中的穿孔、连轧及减径过程,分析每个变形阶段的再结晶行为及组织演变规律,为基于PQF的无缝钢管轧制热机械控制工艺(TMCP)的实现提供实验依据。研究结果表明,在穿孔、连轧和减径3个变形阶段均可以通过不同的再结晶控制轧制策略来细化晶粒,从而实现TMCP。特别是减径过程中通过应变累积实现动态再结晶,并通过随后的快速冷却,能够得到晶粒细小、强韧性好的最终组织性能。所以控制轧制与控制冷却的良好配合是实现TMCP的关键。
Taking P130 grade 30Mn Cr22 steel casing as the research object, the Gleeble-1500D thermal simulation machine was used to carry out multi-pass thermal compression experiments to simulate the perforation, continuous rolling and reducing process of the PQF pipe production, and to analyze each deformation Stage of recrystallization behavior and evolution of the organization for PQF-based seamless steel pipe rolling thermo-mechanical control technology (TMCP) to provide an experimental basis. The results show that the TMCP can be realized by using different recrystallization controlled rolling strategies to refine the grains during the three deformation stages of piercing, rolling and reducing. In particular, the dynamic recrystallization through strain accumulation during the reduction process and the subsequent rapid cooling allow for the final microstructure to be characterized by small grains and good toughness. Therefore, the control of rolling and controlled cooling is a good match TMCP implementation of the key.