G18CrMo2-6钢在高温回火过程中第二相的演变
Evolution of Secondary Phase in G18CrMo2-6 Steel during High Temperature Tempering
应用扫描电子显微镜、透射电子显微镜和能谱技术等手段研究了G18CrMo2-6钢正火组织中第二相在680℃下保温一系列时间段的转变。结果表明,在正火后贝氏体中析出相主要为马氏体/奥氏体(M/A)组元和合金渗碳体(M3C);在回火保温初期M/A分解为铁素体(α)与M3C组织,随着保温时间延长M3C逐渐球化并溶解,M23C6在晶界析出并长大,同时基体上有细小弥散的MC相析出。即回火保温过程中组织随时间的延长发生M/A→α+M3C,M3C→M23C6+MC的变化。
he evolution of the secondary phase in G18CrMo2-6 heat-resistant steel induced by tempering at 680 for a series of durations was investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray detector (EDX). It demonstrates that martensite/austenite (M/A) particles and M3C precipitate on bainite matrix after normalizing. During the tempering, decomposition of M/A particles into the M3C carbides in bainite matrix can be found. The increasing of tempering time results in the precipitation of MC, the spheroidization and refinement of M3C carbide as well as the precipitation and coarsening of M23C6 carbide at the grain boundaries.
郑雷刚、李振江
炼钢
金属材料G18CrMo2-6钢第二相回火演变
郑雷刚,李振江.G18CrMo2-6钢在高温回火过程中第二相的演变[EB/OL].(2023-03-31)[2025-08-18].https://chinaxiv.org/abs/202303.10701.点此复制
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