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利用金相显微镜、电子万能材料试验机、摆锤冲击试验机和布氏硬度计等研究了800～1100℃淬火对EH36高强度船体结构钢显微组织和力学性能的影响。结果表明:800～850℃淬火后的组织主要是铁素体+上贝氏体;900℃时为铁素体+贝氏体+马氏体的三相混合组织;950℃及以上为单一的马氏体组织,随淬火温度的继续升高,位错密度减小,马氏体晶粒长大。水淬后EH36钢的强度和硬度显著提高,冲击韧度大幅度下降;EH36钢的强度、硬度和冲击韧度都随淬火温度的升高而呈先增加后减小的趋势。
The effects of 800 ~ 1100 ℃ quenching on microstructure and mechanical properties of EH36 high strength hull structural steel were studied by means of optical microscope, electronic universal testing machine, pendulum impact tester and Brinell hardness tester. The results show that the microstructure after quenching at 800 ~ 850 ℃ is mainly ferrite + upper bainite; the three - phase mixed structure of ferrite + bainite + martensite at 900 ℃; the single microstructure at 950 ℃ and above Martensite, with the quenching temperature continues to increase, reducing the dislocation density, martensite grain growth. After quenching, the strength and hardness of EH36 steel increased significantly and the impact toughness decreased greatly. The strength, hardness and impact toughness of EH36 steel first increased and then decreased with the increase of quenching temperature.