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通过TEM显微组织来对比、分析QRO90钢具有比8407钢更佳回火稳定性的原因。结果表明：采用1050℃油淬、650℃×2h的相同处理后，发现QRO90钢中由于马氏体分解及残余奥氏体转变的推迟，尚存在高位错密度的马氏体板条及条间残余奥氏体，在马氏体板条内有很多弥散、细小的MC及M2C合金碳化物分布在位错线（区）内，正是这种组织赋予了QRO90钢更佳的回火稳定性。
The reason why QRO90 steel has better tempering stability than 8407 steel is analyzed by TEM microstructure. The results show that martensitic laths with high dislocation density and inter-martensite structures exist in QRO90 steel due to the delayed martensite decomposition and retained austenite transformation after oil quenching at 1050 ℃ and 650 ℃ for 2h. Retained austenite has a lot of dispersion in the martensite lath, and the fine carbides of the MC and M2C alloys are distributed in the dislocation line (zone), which gives the organization better tempering stability of the QRO90 steel .