用质子导体传感法研究钢在脱氢热处理中氢的行为

STUDY ON THE BEHAVIOR OF HYDROGEN IN STEEL HEAT TREATMENT PROCESS WITH PROTON CONDUCTOR SENSOR

采用CaZr_(0.9)In_(0.1)O_(3-α)质子导体传感法测定了钢脱H热处理过程中H的行为.氢传感器的阻抗谱表明氢传感器工作稳定,测定的数据精确可靠.测量了2钢种的p_(H_2)随温度的变化,及在600和800℃恒温时,p_(H_2)随时间的变化,分析了不同温度下钢脱H的效果,研究了H析出过程的速度限制步骤.实验结果表明,所研究的钢样去H热处理温度应高于600℃才能有效脱H,而温度大于727℃并不能进一步脱H.本文实验说明质子导体传感器可以用于在线、连续地检测固体钢中p_(H_2)的变化.

The dehydrogenation behavior in two steels during heat treatment process was investigated by using CaZr_（0.9）In_（0.1）O_（3-α）proton conductor hydrogen sensor and electrochemical impedance spectroscopes of these steels have been measured and analyzed.Based on the changes of hydrogen partial pressure in these steels with temperature and with time at constant temperatures of 600℃and 800℃,it is found that the dehydrogenation begins only when heat treatment temperature is higher than 600℃.Although this temperature exceeds higher than 727℃,the dehydrogenation behavior is not significantly improved.This means that the reasonable heat treatment temperature is in the range of 600-730℃.The experimental results show that the CaZr_（0.9）In_（0.1）O_（3-α）proton conductor hydrogen sensor could be used to monitor in situ changes of partial hydrogen pressure during dehydrogenation of solid state steels as a suitable sensor.