采用冷却性能测试仪测试了不同搅拌转速下硝酸盐介质的冷却特性曲线，分析了搅拌转速对该介质冷却能力的影响；在17CrNiMo6钢棒上加工出 C形试样并进行了渗碳处理，然后分别进行了不同搅拌转速下的硝酸盐浴分级淬火和油淬，分析了搅拌转速和淬火介质对该试样畸变的影响.结果表明：搅拌转速对硝酸盐介质低温冷却速率的影响最为显著；随着搅拌转速的增大，经硝酸盐浴分级淬火后试样的平均畸变率增大，搅拌转速为300 r?min－1时的平均畸变率最小，为1．66％，比快速淬火油淬火后的(2．33％)降低了28．8％；搅拌转速为700 r?min－1时更有利于控制硝酸盐浴分级淬火时试样的畸变量，该速度下的畸变量测试值的均方差最小，平均畸变率为1．84％.
The cooling curves of nitrate medium at different agitation speeds were measured by the cooling performance tester,and the effect of agitation speed on the cooling capacity of the nitrate medium was analyzed.The C-shape sample was machined from the 17CrNiMo6 steel bar,carburized,and then step quenched in the nitrate bath at different agitation speeds,and also quenched in oil respectively.The effects of agitation speed and quenching mediums on the distortion of the sample were analyzed.The results show that the agitation speed had a relatively significant effect on the low-temperature cooling rate of the nitrate medium.With the increase of the agitation speed, the average distortion rate of the sample after the step quenching in the nitrate bath increased and reached the smallest value of 1.66% at the agitation speed of 300 r??min-1 ,which was decreased by 28.8% comparing to that (2.33%)after quenching in rapid quenching oil.The agitation speed of 700 r??min-1 was more suitable for the distortion control of the sample during the step quenching in nitrate bath,at which the mean square error of the measured distortion amounts was the lowest and the average distortion rate was 1.84%.
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