钢结构厚板母材及其焊接影响区的Z向冲击性能试验  

Experimental research of Z-direction impact toughness of thick plate in steel structure

作　　者：王元清[1] 张元元[1] 石永久[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室清华大学土木工程系,北京100084

出　　处：《铁道科学与工程学报》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)

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.

关 键 词：钢结构厚板 焊接影响区 Z向性能 冲击功Ak Q345B 

分 类 号：TU391[建筑科学—结构工程]