应变诱导析出过程中应力的测量常应用弛豫法,通过Gleeble-3500热模拟试验机,采用应力弛豫试验测定了含Nb和不含Nb取向硅钢的沉淀析出动力学PTT曲线。结果表明:PTT曲线均呈现“C”形,鼻尖温度在900~950℃。含Nb试验钢的PTT曲线比不含铌试验钢的PTT曲线偏左上方,即铌的加入加速了第二相的沉淀析出,缩短了孕育期。 Stress relaxation during strain-induced precipitation is often measured by the relaxation method using the Gleeble-3500 thermal simulator to determine the kinetic PTT curve for the precipitation of Nb-containing and non-oriented silicon steels using a stress relaxation test. The results show that the PTT curves show “C” shape with the tip temperature of 900 ~ 950 ℃. The PTT curve of the Nb-containing test steel is slightly above the PTT curve of the Nb-free test steel. That is, the addition of niobium accelerates the precipitation of the second phase and shortens the incubation period.