金相法测定渗碳层深度要求试件必须为退火状态。采用金相法对淬火、低温回火状态渗碳试件进行了渗层深度的测定,并对其误差作了对比分析。实验结果说明,直接用金相法测定淬火、低温回火状态的航空化学热处理试件渗层深度是可行性的。 Metallographic method to determine the depth of carburized layer specimen must be annealed. The metallurgical method was used to measure the depth of infiltrated layer in quenched and tempered carburized specimens. The errors were compared. The experimental results show that it is feasible to directly measure the infiltration depth of the aeronautical heat treatment specimens quenched and tempered at low temperature by the metallographic method.