预变形对超低碳贝氏体钢中ε-Cu析出行为的影响

摘要

研究了10%预变形对0.98%～2.90%Cu超低碳贝氏体钢(%:0.042～0.045C,1.43～1.48Mn,0.30～0.33Si,0.70～0.73Ni,0.29～0.30Mo,0.025～0.029Nb,0.011～0.019Ti,0.001 3～0.002 3B)在450 ℃和550 ℃处理1～104 min的时效动力学行为的影响.试验结果表明,该钢在时效过程时,ε-Cu析出动力学曲线出现硬度峰值,当经过预变形处理后,ε-Cu析出峰值出现的时间显著降低,峰值高度明显增加.在450 ℃时效时,预变形的这一作用更为明显.