Simulation of hot-band microstructure of C-Mn steels during high speed cooling

被引：38
|
作者：
Thompson, M [1 ]
Ferry, M
Manohar, RA
机构：
[1] BHP Integrated Steel, Hot Rolling Grp, Port Kembla, NSW 2505, Australia
[2] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
[3] Univ Wollongong, BHP Inst Steel Proc & Prod, Wollongong, NSW 2522, Australia
来源：
ISIJ INTERNATIONAL | 2001年 / 41卷 / 08期
关键词：
dilatometry; CCT diagrams; C-Mn steel; accelerated cooling; hot strip mill;
D O I：
10.2355/isijinternational.41.891
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The evolution of microstructure in a range of C-Mn steels during hot strip rolling and subsequent high speed cooling was simulated by quench dilatometry using cooling rates up to 600 degreesC/s. The influence of coiling temperature on the microstructure and mechanical properties of the hot band was also investigated by interrupted cooling experiments. Continuous cooling transformation (CCT) diagrams for a range of cooling schedules were constructed for each steel where It was found that rapid cooling lowers significantly the Ar-3 temperature, refines the ferrite to grain sizes in the range 3-6 mum and increases the hardness. An increase in Mn content (mass %) from 0.45 to 1.0 % lowers the Ar-3 temperature, retards the rate of gamma --> alpha transformation and promotes the formation of non-equilibrium phases. The role of alloying additions, in combination with cooling rate and coiling temperature is discussed in the context of microstructural development and strengthening of as-hot-rolled C-Mn strip.
引用
收藏
页码：891 / 899
页数：9
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