摘要
为研究厚板及其焊缝在Z向下的冲击性能,积累Z向冲击功的数据,为今后衡量评价Z向性能提供实验依据,采用Q345B结构钢材,针对厚度60～165 mm的板,在不同尺寸焊缝的十字形连接下沿轧制方向和板厚方向(Z向)取样,在常温和低温下进行夏比V形缺口冲击试验。分析冲击功的变化规律,并用Boltzman函数进行拟合并分析韧脆转变温度。对试样断口进行电镜扫描分析。研究结果表明:Z向取样,温度降低皆会对冲击韧性产生较大的影响,板厚及焊缝尺寸的增加也会对冲击韧性产生不利的影响,但相对较低。
To study Z - direction impact toughness of thick plate and its weld, the data of Z - direction impact toughne was accumulated and integrated rules were given for evaluating Z - direction properties, Sharp V notch impact experiments were to be done as follows. The Q345B structural steel with its thickness from 60 ~ 165 mm was used and welded by different styles and different sizes, and samples were extracted from rolling direction and Z - direction, then impact test would be done in normal and low temperature. The change law of impact tough- ness was analyzed and ductile - brittle transition temperature was obtained by Boltzmann equation. At last the fracture was analyzed by electron microscope. The results show that under the condition of Z - direction sam- pling, the decrease of temperature will have a substantial effect on impact toughness, and the increase of the plate thickness and weld size will also influence the impact toughness, while not much relatively.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第5期1-6,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50778102)
