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本文采用数字电压表-数字打印机作记录装置的热分析法,研究了形变工艺参数:加热温度(950～1200℃)、轧制温度 (800～1200℃)、形变量 (至50％)、冷却速度 (0.85～45℃/s) 对低碳钢(含C0.135%、Si0.226%、Mn0.61%) 过冷奥氏体相变温度 (Ar_3和Ar_1) 的影响.证明形变使Ar_3温度升高.加热温度越低、轧制温度越低、形变量越大,Ar_3温度就越高.加热温度在1000～1100℃间、轧制温度在1000℃以下、形变量在10～30％间对Ar_3温度影响显著.其中尤以形变量的影响最为突出.冷却速度越大,形变的影响也越大.在试验的条件下,形变能使Ar_3温度提高20～50℃.形变对于低碳钢的Ar_1温度产生复杂的影响.形变既可以促进也可以抑制珠光体的转变.
In this paper, the thermal analysis method of digital voltmeter-digital printer as recording device was used to study the parameters of the deformation process: heating temperature (950-1200 ℃), rolling temperature (800-1200 ℃), deformation (up to 50% (0.85 ~ 45 ℃ / s) on the undercooled austenite transformation temperatures (Ar 3 and Ar 1) in low carbon steels (including C0.135%, Si0.226% and Mn0.61% The higher the temperature, the lower the heating temperature, the lower the rolling temperature, the greater the deformation, the higher the Ar_3 temperature.The heating temperature is between 1000 ~ 1100 ℃, the rolling temperature is below 1000 ℃, the deformation is between 10 ~ 30% Among them, the influence of deformation is the most prominent.The larger the cooling rate, the greater the influence of deformation.According to the experimental conditions, the deformation can make the Ar_3 temperature increase by 20 ~ 50 ℃ .Deformation for low carbon The Ar1 temperature of steel has a complex effect, and deformation can both promote and suppress pearlite transformation.