摘要
通过加热炉模拟试验、组织观察、性能测试以及X射线衍射分析,研究了Nb-Ti复合IF钢的再结晶温度,并根据该温度范围制定合理的罩式退火工艺,研究了保温温度对试验钢组织性能的影响。结果表明：试验钢的再结晶开始温度为600℃,终止温度为660℃,再结晶时间为1.2 h左右。在再结晶温度以上退火后,组织为等轴状铁素体,随保温温度上升,晶粒尺寸略有增加,晶粒度级别在8~9级之间,属于有利于冲压的晶粒尺寸范围。随着保温温度的升高,A_（80）值有所上升,从41%增长到44%;Δr值下降,从0.19下降到0.03。R_（e L）、R_m、n值变化不大,r值得到改善,从2.18增长到2.35。织构方面,随着保温温度的上升,有利织构组分{001}〈110〉、{112}〈110〉进一步向{111}〈110〉、{111}〈112〉转化。罩式退火保温温度为710℃时,IF钢综合力学性能最优。
The recrystallization temperature of Nb-Ti bearing IF steel was studied.Based on the batch annealing process planned according to recrystallization temperature,the effect of soaking temperature on the microstructure and properties was investigated by heating furnace simulation tests,microstructure observation,properties tests and X-ray diffraction analysis.The results show that the starting temperature of recrystallization is 600℃,the finishing temperature is 660℃,and the recrystallization time lasts for 1.2 hours.The microstructure is equiaxed ferrite when annealed above the recrystallization temperature.The grain size slightly increases with the increase of annealing temperature and the grain grade is 8-9.This grain size range is good for punching.As holding temperature increases,the value of A rises from 41%to 44%,the value ofΔr declines from 0.19 to 0.03,R_（e L）and R_mrise slightly,n-value hardly changes and r-value is improved from 2.18 to 2.35.In aspect of texture,as holding temperature rises,the favor textures{001}110、{112}110,transfer to{111}110、{111}112.The comprehensive mechanical properties of IF steel are the best when the batch annealing temperature is 710℃.
作者
韩玉龙
周乐育
Han Yulong1 , Zhou Leyu2, 3(1. Compact Strip Plant, BaoTou Iron and Steel Co. , Ltd. , Baotou Inner Mongolia 014010, China; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Beijing Research Institute of Mechanical ＆ Electrical Technology, Beijing 100083, Chin)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第3期171-176,共6页
Heat Treatment of Metals
关键词
Nb-Ti复合IF钢
退火温度
再结晶
组织
性能
织构
Nb-Ti bearing IF steel
annealing temperature
recrystallization
microstructure
proepreties
texture
