TMCP工艺下Ti-Mg氧化物冶金钢轧态组织性能

摘要：为研究轧制过程中氧化物粒子对母材组织性能的影响，提出了一种只在再结晶区进行轧制的新工艺路线，利用常规冶炼及氧化物冶炼的实验钢分析其轧态显微组织、力学性能及相变过程。结果表明：在新轧制工艺下，氧化物冶金钢母材显微组织由常规的贝氏体板条束变为针状铁素体，其基体具有良好的力学性能，-80℃冲击韧性达149J；热轧工艺下的组织转变分两阶段进行，初期是针状铁素体的形核和晶粒细化，之后贝氏体相变被限制在针状铁素体板条间构成的区域内。

Microstructure and properties of Ti-Mg oxide metallurgy steel under TMCP process

In order to study the effect of oxide particles on microstructure and mechanical properties of the base metal, a new rolling process was proposed, which was carried out only in the recrystallization zone. And as-rolled microstructure, mechanical properties and microstructure transformation of experimental steels treated by common aluminium deoxidation and oxide metallurgy process were researched. Results show that the microstructure of oxide metallurgy steel changes from conventional bainite packets to acicular ferrites under the new rolling process. The matrix has good mechanical properties with impact toughness up to 149J at -80℃. During the hot rolling process, the microstructure transformation is carried out in two stages. The initial stage is the nucleation of acicular ferrite and grain refinement, and the bainite transformation is restrained in the regions formed between acicular ferrite plates.