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对一定拉伸预载下的Ａ３钢试样进行了快速加热实验，研究了温升率对Ａ３钢力学性能的影响。结果表明：温升率对自由热膨胀影响不大；温升率越大，产生相同塑性变形需要的温度越高；温升率明显影响Ａ３钢内部变化机制；温升率将决定试样热冲击后的晶粒大小。
The A3 steel specimens under a certain tension preload were subjected to rapid heating test, and the effect of temperature rise rate on the mechanical properties of A3 steel was studied. The results show that: the rate of temperature rise has little effect on the free thermal expansion; the larger the rate of temperature rise, the higher the temperature required to produce the same plastic deformation; the rate of temperature rise significantly affects the internal mechanism of A3 steel; the rate of temperature rise will determine the thermal shock Of the grain size.