Abstract

Dynamic recrystallization (DR) of austenite of a medium-carbon steel microalloyed with titanium, niobium, vanadium, and boron has been studied in the course of deformation treatment in the temperature range of 850–1180°C using strain rates of 1–100 s^–1. It has been established that the threshold deformation corresponding to the onset of the DR increases in a regular way with increasing strain rate from 1 to 10 s^–1 and decreases sharply at 100 s^–1. In this case, fine grains (D ≈ 8 μm) are formed, which evidences the occurrence of a specific mechanism of the formation of the austenite structure.

中文翻译：

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微合金化中碳钢高应变速率热变形时奥氏体晶粒的异常细化

摘要

在850-1180°C的温度范围内使用1-100 s的应变速率进行了变形处理的过程中，研究了微合金化钛，铌，钒和硼的中碳钢奥氏体的动态再结晶（DR）。^–1。现已确定，与DR发生相对应的阈值变形会随着应变率从1到10 s ^–1的增加而有规律地增加，并在100 s ^-1时急剧减少。在这种情况下，细颗粒（d ≈8微米）被形成，也就是证明了奥氏体结构的形成的特定机制的发生。