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采用SEM、TEM和力学性能测试等手段,研究了预备热处理对AMS 6308钢组织及性能的影响。结果表明,980℃以下正火,随着温度的提高,M6C碳化物逐渐溶解,晶粒细小,淬火后马氏体板条均匀细小,碳化物呈球状或椭球状弥散分布在板条界和晶界上,碳化物体积分数和位错密度较高,强度和冲击值逐渐增加。980℃以上正火,M6C碳化物溶解增多,晶粒开始长大,淬火后马氏体板条束尺寸也长大,碳化物体积分数和位错密度下降,强度和冲击值降低。推荐的预备热处理制度:正火温度为980~1 010℃,回火温度为680~700℃,经性能热处理后,AMS 6308钢体现出良好的强韧性匹配。
The effects of pre-heat treatment on the microstructure and properties of AMS 6308 steel were studied by SEM, TEM and mechanical properties testing. The results show that the normalized martensite below 980 ℃, with the increase of temperature, the carbides of M6C gradually dissolve and the grains are fine. The martensite laths are even and fine after quenching. The carbides are spheroidal or ellipsoid dispersedly distributed in the slab boundary and crystal In the world, the carbide volume fraction and dislocation density are higher, and the intensity and impact value increase gradually. When the temperature is above 980 ℃, the dissolution of M6C carbides increases, and the grains begin to grow up. The martensite lath size increases after quenching, the volume fraction of carbides and dislocation density decrease, and the strength and impact value decrease. Recommended preparation heat treatment system: normalizing temperature of 980 ~ 1 010 ℃, tempering temperature of 680 ~ 700 ℃, the performance of heat treatment, AMS 6308 steel shows good toughness match.