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采用金相显微镜、拉伸试验机、摆锤冲击试验机、维氏硬度计、弯曲试验机等研究了750~1000℃的水火校正温度范围内EH36高强度船体结构钢显微组织和力学性能的变化规律。结果表明:在750~1000℃水火校正后,EH36高强度船体结构钢显微组织均为铁素体+珠光体。随着校正温度的升高,晶粒粗大,块状铁素体数量减少,片状铁素体和针状铁素体增多,魏氏组织越来越严重。随着校正温度的升高,EH36钢板的强度和硬度升高,塑性韧性降低。当校正温度达到950℃时,纵向拉伸的断后伸长率已达到CCS规范要求的下限值。建议水火校正工艺的温度应小于950℃。
The microstructure and mechanical properties of EH36 high strength hull structural steel in water-fire correction temperature range from 750 ℃ to 1000 ℃ were studied by means of optical microscope, tensile tester, pendulum impact tester, Vickers hardness tester and bending tester. The law of change. The results show that the microstructures of EH36 high-strength hull structural steel are ferrite + pearlite after water-fire calibration at 750-1000 ℃. With the increase of the correction temperature, the grains are coarse, the amount of massive ferrite decreases, the amount of lamellar ferrite and acicular ferrite increases, and the structure of Weissenberg becomes more and more serious. With the increase of the calibration temperature, the strength and hardness of EH36 steel plate increase, and the plastic toughness decreases. When the correction temperature reaches 950 ℃, the elongation at break of longitudinal stretching has reached the lower limit of CCS standard. Recommended water temperature correction process should be less than 950 ℃.