冷变形和再结晶退火对TP304钢晶粒度的影响

对TP304钢实施19%和25%的冷塑性变形后,分别在650℃、700℃、800℃及900℃下进行30 min再结晶退火,研究变形率和再结晶退火温度对TP304钢晶粒度的影响。结果表明,TP304钢在650℃、700℃及800℃下再结晶退火30 min,不能实现完全再结晶;900℃下再结晶退火30 min,可获得完全再结晶组织;19%冷变形+900℃再结晶退火30 min,TP304钢晶粒平均直径从40μm细化到22μm;25%冷变形+900℃再结晶退火30 min,TP304钢晶粒平均直径从40μm细化到17μm,二者晶粒度级别均由6级细化到8级,25%冷变形+900℃再结晶退火30 min的细化晶粒效果最优。

Influence of cold deformation and recrystallization annealing on grain size of TP304 steel

Influence of the deformation rate and recrystallization annealing temperature on grain size of TP304 steel treated with 19%and 25%deformation rate and recrystallizated by annealing at 650 ℃,700 ℃,800 ℃ and 900 ℃ for 30 min,was researched.The results indicate that the complete recrystallization is not obtained after annealing at 650 ℃,700 ℃ and 800 ℃ for 30 min.However,the complete recrystallization microstructure is obtained at 900 ℃.The average grain size of TP304 steel treated by annealing at 900 ℃ and 19%deformation rate is refined from 40 to 22 μm.Whereas the average grain size treated by annealing at 900 ℃ and 25%deformation rate is decreased from 40 to 17 μm.The grain of TP304 steels treated by the two processes is refined from grade 6 to grade 8,the best grain refinement process is by recrystallization annealing at 900 ℃ for 30 min and with 25%deformation rate.