论文部分内容阅读
众所周知,真空气淬时通常通入99.99%以上的高纯氮,常用压力为600～700托,最高不超过750托。由实验得知,气淬时,冷却速度与气体压力的0.8次幂成正比,即气体压力增大时,冷却速度增大,当气压增至1.7公斤力/厘米~2时,冷却速度约提高一倍,亦即冷却所需时间可减少50%。对于气淬钢,增加气体压力就可以增加真空冷却能力,从而使较大截面的零件也能淬透。显然,对于一定截面大小的油淬钢也可以
As we all know, when the vacuum gas quench usually pass more than 99.99% of high purity nitrogen, the pressure is 600 ~ 700 torr, the maximum does not exceed 750 torr. According to the experiment, the cooling rate is proportional to the 0.8 power of the gas pressure when the gas is quenched. That is, when the gas pressure increases, the cooling rate increases. When the pressure increases to 1.7 kgf / cm ~ 2, the cooling rate increases Double, that is cooling time can be reduced by 50%. For gas-quenched steels, increasing the gas pressure increases the vacuum cooling capacity, allowing larger cross-section components to be hardened. Obviously, for a certain size of the oil quenched steel can be