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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Analysis of Mn Effect on Recrystallization Kinetics in High Nb Steels
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Analysis of Mn Effect on Recrystallization Kinetics in High Nb Steels

机译：Mn对高Nb钢再结晶动力学的影响分析

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摘要

A physically based model is used to analyze quantitatively, the relative contributions of solute Nb and strain-induced NbC precipitation to the retardation of static recrystallization during the interpass time. The model explicitly takes into account the time evolution of strain-induced precipitation and its interaction with recovery and recrystallization. It is thus possible to quantitatively model the recrystallization kinetics taking into account: ⅰ) the effect of solute drag on the boundary mobility, ⅱ) the effect of particle pinning (Zener drag) on the driving force for boundary motion, and ⅲ) the effect of dislocation pinning by strain-induced precipitates, on the recovery kinetics and the nucleation of recrystallization. The analysis shows that there is an optimum partitioning of Nb between matrix solute and strain induced precipitates. This optimum partitioning maximizes particle pinning while ensuring an adequate solute drag effect to prevent the boundary from breaking away from solute atmosphere. The optimum partitioning of Nb between the matrix and the precipitates is shown to depend upon the temperature window of rolling, pass reduction and interpass time. The effect of delaying the kinetics of strain-induced precipitation of NbC through large Mn addition is shown to be an advantage for ensuring adequate solute drag in the low temperature, large pass deformation schedule used in near-net shape processing of thin slab or thick strip castings.
机译：使用基于物理的模型来定量分析熔体Nb和应变诱导的NbC析出在相穿时间内延迟静态再结晶的相对贡献。该模型明确考虑了应变诱发降水的时间演化及其与采收和再结晶的相互作用。因此，可以考虑以下因素对重结晶动力学进行定量建模：ⅰ）溶质阻力对边界迁移率的影响，ⅱ）粒子钉扎（Zener阻力）对边界运动驱动力的影响，以及ⅲ）影响应变诱发的析出物位错钉扎对恢复动力学和重结晶成核的影响。分析表明，Nb在基质溶质和应变诱导的析出物之间有最佳分配。这种最佳分配可以最大程度地固定颗粒，同时确保适当的溶质拖曳效应，以防止边界脱离溶质气氛。 Nb在基体和析出物之间的最佳分配显示出取决于轧制的温度窗口，道次还原和道次时间。通过大量添加Mn来延缓应变诱导NbC析出动力学的效果被证明是确保在低温条件下确保足够的溶质阻力，薄板坯或厚带材的近净形加工中使用的大通过变形计划的优势铸件。

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