Dynamic Recrystallization Behavior of Austenite in Nb-bearing High Strength Low Alloy Steels and Stainless Steel
Dynamic Recrystallization Behavior of Austenite in Nb-bearing High Strength Low Alloy Steels and Stainless Steel
复制标题
含铌高强度低合金钢和不锈钢中奥氏体的动态再结晶行为
DOI：
10.2355/isijinternational1966.22.543
复制
发表时间：
1982
影响因子：
1.8
通讯作者：
T. Okita
中科院分区：
文献类型：
--
作者：
C. Ouchi;T. Okita
采用热压缩试验研究了含nb高强度钢和18-8不锈钢中奥氏体的动态再结晶行为。热变形设备结合了快速冷却系统和在线数据分析系统，可以通过完全抑制静态恢复和再结晶来研究与恢复过程相关的微观组织变化。在应变速率5×10-4 ~ 10s-1、温度900 ~ 1200℃范围内，研究了应变为0.70时的应力-应变行为。在Zener-Hollomon参数小于1015s-1的条件下变形的钢均出现动态再结晶，但在最高应变速率为10s-1时未发生动态再结晶。在任何变形条件下，高强度钢中Nb含量的增加都增加了流动应力，也增加了动态再结晶开始时的应变。动态再结晶晶粒尺寸主要与Zener-Hollomon参数值有关，而不受初始晶粒尺寸的影响。通过薄膜透射电镜观察并结合硬度测量结果，研究了动态恢复和动态再结晶过程中微观组织的变化。
Dynamic recrystallization behavior of austenite in Nb-bearing HSLA steels as well as 18-8 stainless steel was investigated by hot compression testing. The hot deformation equipment, incorporating a rapid cooling system and an on-line data analysis system, made it possible to investigate the microstructural changes associated with the restoration process by fully suppressing the static recovery and recrystallization. The stress-strain behavior to a strain of 0.70 was investigated in the range of strain rate from 5×10-4 to 10s-1 and of temperature from 900 to 1200°C. Dynamic recrystallization was observed in all the steels deformed under the condition of the Zener-Hollomon parameter being less than 1015s-1, but it was not observed with the highest strain rate of 10s-1. An increase of Nb content in the HSLA steels increased the flow stress for any deformation condition and also increased the strain at onset of dynamic recrystallization. Dynamically recrystallized grain size was primarily related to the value of the Zener-Hollomon parameter, but was not influenced by the initial grain size. The microstructural changes accompanying dynamic recovery and dynamic recrystallization were investigated by thin foil TEM observation and related to the results of hardness measurements.