Dynamic and Static Recrystallization Behavior of Low Carbon High Niobium Microalloyed Steel

The recrystallization behavior of a low carbon high niobium microalloyed steel was investigated using continuous and interrupted hot compression tests. The results showed that the initiation of dynamic recrystallization （DRX） could be detected from inflection in the plot of the strain hardening rate...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2011, Vol.18 (1), p.55-60
Main Authors: LAN, Liang-yun, QIU, Chun-lin, ZHAO, De-wen, GAO, Xiu-hua, DU, Lin-xiu
Format: Article
Language:English
Subjects:
activity energy
Applied and Technical Physics
Carbon
Dynamic recrystallization
Engineering
high niobium microalloyed steel
Iron and steel industry
Machines
Manufacturing
Materials Engineering
Materials Science
Mathematical analysis
Metallic Materials
Niobium
Physical Chemistry
Processes
Recrystallization
Softening
static recrystallization
Steels
再结晶动力学
再结晶行为
动态再结晶
变形温度
铌微合金化钢
铌微合金钢
静态软化
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Summary:The recrystallization behavior of a low carbon high niobium microalloyed steel was investigated using continuous and interrupted hot compression tests. The results showed that the initiation of dynamic recrystallization （DRX） could be detected from inflection in the plot of the strain hardening rate against stress regardless of the stress peak appearance. According to the Zener-Hollomon parameter equation, the activity energy of DRX （Qad） was ob tained and a new modified expression calculating Qdef was proposed in consideration of the chemical composition of experimental steel. Applying the 2% offset method, the static softening fraction was determined. The graphic representation of the softening fraction vs interruption time gave the information about the non-static reerystallization temperature （about 1 000℃ ） and the relationship of precipitation time temperature. Static recrystallization kinetics followed the Avrami＇s law at high deformation temperature, and different values of the exponent m were given to illustrate the effect of niobium element on static recrystallization at different deformation temperatures.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(11)60011-3