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采用透射电镜、X—射线等手段研究了不同回火方式和时间下 W6Mo5Cr4V2高速纲力学性能与组织的变化。发现淬火该钢经560和630℃多次回火后马氏体内孪晶清晰完整,板条马氏体中仍然存在着以魏氏组织形态分布的 M_3C 型碳化物。证实380℃×(0.5～5)h+560℃×1h×2次的低高温配合回火工艺与560℃×1h×3次的普通回火相比,可使高速钢的硬度、红硬性及冲击韧性提高.采用560℃×(1～3)h×3次的回火工艺时,随每次回火时间延长,高速钢的强度、冲击韧性和断裂韧性提高,红硬性变化不大,但硬度则稍稍下降(约1HRC).
The change of mechanical properties and microstructure of W6Mo5Cr4V2 high speed gear with different tempering method and time were studied by means of TEM and X-ray. It was found that the quenching of the steel after 560 and 630 ℃ repeated tempering martensite twin clear and complete, lath martensite still exists in Wei’s organization distribution of M_3C type carbide. Confirmed that the 380 ℃ × (0.5 ~ 5) h + 560 ℃ × 1h × 2 times the low temperature with the tempering process and 560 ℃ × 1h × 3 times compared to ordinary tempering, high-speed steel hardness, red hardness and The impact toughness of the high-speed steel increases with the tempering temperature of 560 ℃ × 1 ~ 3h × 3 times, the strength, impact toughness and fracture toughness of high-speed steel increase with each tempering time. Then slightly lower (about 1HRC).