氢分子在几种高铬镍合金钢中微扩散所引起的内耗峰

用扭摆作内耗测量,发现八种高铬镍合金钢中含氢可以引起内耗峰。当振动频率约为每秒1.5周时,内耗峰的巅值温度在610—640℃附近。用其中一种高铬镍合金钢试样(18Cr 12Ni)进行了系统的实验,指出这个内耗峰的基元过程是一种弛豫过程,所包含的激活能约为46,000—50,000卡/克分子。根据激活能的数值以及内耗峰在升温、降温和保温时的变化情况,可以认为这个新内耗峰是由於氢分子在钢中微扩散所引起来的。内耗测量的结果也指出了在18Cr 12Ni钢中在特定的升温、降温速度下氢分子舆氢原子的转变温度范围,所得的结果舆资料上的相合。

INTERNAL FRICTION PEAK ASSOCIATED WITH THE STRESSINDUCED DIFFUSION OF HYDROGEN MOLECULES IN HIGH CHROMIUM-NICKEL ALLOY STEELS

Internal friction peaks associated with the presence of hydrogen in eight types of high chromium-nickel alloy steel were observed in measurements with a torsion pendulum. The optimum temperature for maximum internal friction lies between 610-640℃ for a frequency of vibration of about 1.5 cycles per second. Systematic investigations were made with specimens containing 18% of Cr and 12% of Ni. The elementary process for this internal friction peak was found to be a relaxation process, associated with an activation energy of about 46,000-50,000 calories per mole. Judging from the value of this activation energy, as well as from the behavior of the internal friction peak when the measurements were taken while the temperature was raised, lowered and kept constant, the conclusion was reached that the new internal friction peak is associated with the stress-induced micro-diffusion of hydrogen molecules in high alloy steels.Internal friction measurements were also able to disclose the temperature range in which transformations between hydrogen molecules and hydrogen atoms are taking place in 18 Cr 12 Ni alloy steel specimens for a given rate of heating and cooling. The results obtained are in agreement with those found in the literature.