JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.3 P.217-228

Experimental study on the through-thickness properties of structural steel thick plate and its heat-affected zone at low temperatures

Author(s): Yuan-qing Wang, Xiao-wei Liao, Yuan-yuan Zhang, Yong-jiu Shi
Affiliation(s): Key laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Corresponding email(s): wang-yq@mail.tsinghua.edu.cn
Key Words: Structural steel thick plate, Through-thickness properties, Mechanical properties, Impact toughness, Fracture toughness, Low temperature

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Abstract: Lamellar tearing and crack-induced brittle failures along steel plates in the through-thickness direction seriously threaten the safety and reliability of steel thick plate structures in construction and service, especially at low ambient temperatures. Three kinds of tests, including uniaxial tensile tests, Charpy V-Notch impact tests, and three-point bending (TPB) tests were performed at normal and low temperatures to investigate the through-thickness mechanical properties, impact and fracture toughness of Q345B structural steel plates with thicknesses from 60 to 165 mm. The test specimens were mainly sampled along the through-thickness direction of the plate, but transverse specimens along the rolling direction were also involved. The ductility index (percentage reduction of area), impact toughness index (Charpy impact energy), and fracture toughness index (critical crack tip opening displacement (CTOD) values) all decrease as the temperature declines. All the mechanical properties and the impact and fracture toughness along the through-thickness direction are worse than those along the rolling direction. The results also offer experimental support for the determination of an evaluation indicator for structural steel thick plates with through-thickness characteristics.

低温条件下钢结构厚板及其热影响区的Z向性能试验研究

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。

关键词：钢结构厚板；Z向性能；力学性能；冲击韧性；断裂韧性；低温环境

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