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以低合金高强度工程机械用钢为对象,研究该钢种的淬火工艺对其组织和力学性能的影响。结果表明,随淬火温度的升高,试样中都存在着板条状马氏体和少量奥氏体,且马氏体含量逐渐增多,存在碳化物的析出。结合力学性能曲线可以看出,低合金高强度工程机械用钢的最佳淬火温度为900℃,此时试样的强度和韧性的综合性能达到最优值。不同温度淬火后试样的断口中都存在大量的韧窝,但这些韧窝的深浅不一。
Low-alloy and high-strength engineering machinery steel is taken as an object to study the influence of quenching process on the microstructure and mechanical properties of the steel. The results show that as the quenching temperature increases, there are slab martensite and a small amount of austenite in the sample, and the martensite content gradually increases, and the precipitation of carbides exists. Combining with the mechanical performance curve, it can be seen that the optimum quenching temperature of the low alloy high strength engineering steel is 900 ℃, and the comprehensive strength of the sample and the toughness achieve the optimum value. There are a large number of dimples in the fracture surface of specimens after quenching at different temperatures, but the depths of these dimples vary.