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目的:系统研究钢结构厚板在常温和低温条件下的Z向性能,并为其工程应用和评价指标的制定提供基础数据。方法:在常温和低温条件下,分别通过单轴静力拉伸试验、夏比V型缺口冲击韧性试验和三点弯曲试验,研究钢结构厚板钢材及其热影响区的Z向和沿钢板轧制方向的力学性能指标、冲击韧性和断裂韧性随温度和钢板厚度变化的规律;并通过扫描电镜微观图像分析冲击试验和断裂试验的断口随温度和钢板厚度的变化。结论:1.钢结构厚板的Z向性能要低于沿钢板轧制方向的性能,包括屈服强度、抗拉强度、延性指标、冲击韧性和断裂韧性;2.焊接热输入会降低钢结构厚板热影响区母材Z向的力学和韧性指标;3.相比沿轧制方向的性能,钢结构厚板的Z向性能对温度和厚度的变化更敏感。
OBJECTIVE: To systematically study the Z-direction properties of steel plate under normal temperature and low temperature, and provide basic data for its engineering application and evaluation index. Methods: Uniaxial static tensile test, Charpy V-notch impact toughness test and three-point bending test were carried out at room temperature and low temperature respectively to study the influence of Z-direction and plate along the steel plate Rolling direction of the mechanical properties, impact toughness and fracture toughness with the temperature and the thickness of the plate thickness changes; and microscopic images through scanning electron microscopy analysis of fracture and fracture test with the temperature and thickness of the steel plate. Conclusion: 1. The Z-direction performance of the steel plate is lower than that along the steel plate rolling direction, including the yield strength, tensile strength, ductility index, impact toughness and fracture toughness; 2. Welding heat input will reduce the thickness of the steel structure Z-axis mechanical and ductile index of the heat affected zone base material; 3. Z-direction properties of the steel plate are more sensitive to changes in temperature and thickness than properties along the rolling direction.