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Mechanism of boundary induced transformation and its application in the grain refinement of large-size structural steels

机译：边界诱导转化机制及其在大尺寸结构钢晶粒细化中的应用

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摘要

The conventional thermal-mechanical control processing technology governed by a heavy reduction at a relatively lower temperature has been applied successfully in the refinement of the final microstructure of hot-rolled steels. However, it might not be the best method for the manufacture of large-size structural steels due to their limited reduction ratio and relatively high temperature during hot rolling. Boundary induced transformation (BIT), is proposed in the present paper as an alternative approach for the grain refinement of large-size structural steels. The austenite grain size during reheating and rough rolling is controlled by Ti microalloying with the aim of reducing the critical strain for the onset of dynamic recrystallization (DRX) in the subsequent rolling. The precipitation of NbC particles and their inhibition of static recrystallization during the interpass interval is responsible for the accumulation of strain to ensure the occurrence of DRX in finish rolling. Consequently, the large amount of austenite grain boundaries resulted from the formation of fine DRXed grains will provide potent nucleation sites for the phase transformation from austenite to ferrite and then lead to an effective grain refinement. The experimental results demonstrate that the ferrite grain size can be significantly refined via this approach, illustrating that BIT mechanism is very applicable to refine grain size effectively for the large-size structural steels with limited reduction ratio.
机译：在热轧钢的最终微观结构的改进中成功地应用了在相对较低的温度下的重度减小的传统热机械控制处理技术。然而，由于它们在热轧过程中的减少率和相对较高的温度下，它可能不是制造大型结构钢的最佳方法。边界诱导的转化（位），在本文中提出作为大尺寸结构钢晶粒细化的替代方法。在再加热和粗轧期间的奥氏体晶粒尺寸由Ti微合金化控制，目的是降低随后的轧制中动态再结晶（DRX）发作的临界应变。 NBC颗粒的沉淀及其对接口间隔期间的静态重结晶的抑制负责菌株的累积，以确保DRX在完成轧制中发生。因此，由形成细化晶粒的形成产生的大量奥氏体晶界将为从奥氏体到铁氧体的相变，然后导致有效的晶粒细化。实验结果表明，通过这种方法可以显着地精制铁氧体粒度，说明位机构非常适用于有效的细粒尺寸，用于减小有限的大尺寸结构钢。

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