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35Cr3Mo3W2V钢是一种含有较多碳化物形成元素的热作模具钢。该钢经高温奥氏体化淬火、530～560℃回火后,出现二次硬化现象。62D～650℃回火钢在600～650℃进行高温短时拉伸和高温冲击试验时,塑性、韧性降低,有高温脆化现象发生。经透射电子显微组织分析和扫描电子显微断口分析,发现这种现象是和在此温度范围内组织中碳化物类型转变、碳化物分布特点和杂质元素在晶界上偏析有关。700℃回火,基体开始回复,碳化物质点长大,硬度、强度降低,塑性、韧性升高。
35Cr3Mo3W2V steel is a kind of hot work die steel containing more carbide forming elements. The steel after austenitizing quenching, tempering 530 ~ 560 ℃, there secondary hardening phenomenon. 62D ~ 650 ℃ tempered steel at 600 ~ 650 ℃ short-term high-temperature tensile and high temperature impact test, plasticity, toughness decreased, high temperature embrittlement occurs. Transmission electron microscopy and scanning electron microscopy fracture analysis showed that this phenomenon was related to the type of carbide transformation, the distribution of carbides and the segregation of impurity elements in the grain boundaries in this temperature range. Tempering at 700 ℃, the matrix began to recover, carbide particles grow, hardness, strength decreased, plasticity, toughness increased.