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研究了Nb在快速感应加热条件下对C95油井管用调质钢显微组织的影响。将不同Nb含量的试验钢感应加热到850℃~1000℃后立即淬火,结果表明,不含Nb试验钢奥氏体晶粒尺寸与淬火温度服从Arrhenius关系(D=8.98×102exp(-5.8×103/T)),而含Nb试验钢存在一个临界温度T c,且Nb含量增加T c升高,超过临界温度T c后服从Arrhenius关系,T c以下Nb显著抑制奥氏体晶粒长大。扫描电镜分析表明,Nb不仅减小了奥氏体晶粒尺寸同时还减小了马氏体板条束尺寸,650℃回火后含Nb试验钢的回火硬度较高,不含Nb试验钢的回火硬度随淬火温度的升高而明显下降,而含Nb试验钢的回火硬度随淬火温度升高变化不大。
The effect of Nb on the microstructure of C95 oil well quenched and tempered steel under rapid induction heating was studied. The results show that the austenite grain size and quenching temperature of Nb-free test steel obey the Arrhenius relation (D = 8.98 × 102exp (-5.8 × 103 / T). However, there is a critical temperature T c in the Nb-containing test steel and the T c increases with the increase of the Nb content. After exceeding the critical temperature T c, the Arrhenius relation is obeyed. Nb below T c significantly inhibits austenite grain growth. Scanning electron microscopy analysis showed that Nb not only reduced the austenite grain size but also reduced the martensite lath size. After tempering at 650 ℃, the Nb-containing test steel had higher tempering hardness and no Nb test steel The tempering hardness decreases with the increase of quenching temperature, while the tempering hardness of Nb-containing test steel does not change much with quenching temperature.