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第 41 卷第 9 期钢铁 Vol. 41 , No. 9
2 0 0 6 年 9 月 Iron and Steel September 2006
回火工艺对针状铁素体钢组织和性能的影响
康军艳, 余伟, 陈银莉
(北京科技大学高效轧制国家工程研究中心, 北京 100083)
摘要: 对针状铁素体钢进行 540~630 ℃回火后的组织、性能进行了研究。与轧态相比,630 ℃回火后钢的屈服
强度提高 75 MPa ,伸长率的平均值降低 1. 9 % ,冲击功的平均值提高 1. 75 J 。对回火前、后钢板的组织和析出物进
行了对比分析,结果表明:回火后晶粒内部的位错密度减小,亚晶板条部分消失;回火后析出物粒子的平均尺寸减
小;回火温度越高,析出物粒子的平均尺寸越大。630 ℃回火以后,在 1~10 nm 尺度范围内的粒子分布频度增加 2
~3 倍,铌的析出量增加了 166. 9 % ,钒的析出量增加了 584. 6 %。细小析出物的增加和亚晶板条的部分消失是强
度提高、塑性改善2 的主要原因。 2 2 2
关键词: 针状铁素体; 回火; 显微组织; 力学性能; 析出
中图分类号: T G142. 1 文献标识码: A 文章编号: 0449 749X(2006) 09 0065 05
Effect of Temper on Microstructure and Mechanical
Properties of Acicular Ferrite Steel
KAN G J un yan , YU Wei , CH EN Yin li
(National Engineering Research Center for Advanced Rolling Technology ,
University of Science and Technology Beijing , Beijing 100083 , China)
Abstract : The microstructure and properties of acicular ferrite steel tempered from 540 ℃ to 630 ℃ were studied.
Compared with the steel as rolled , the yield strength of steel tempered at 630 ℃was increased by 75 MPa , the mean
elongation was decreased by 1. 9 % and the mean impact toughness was almost unchanged. parison of the mi
crostructure and precipitates before and after tempering , it can be concluded that in tempered steel the intragranular
dislocation density is lower and part of plate