论文部分内容阅读
对所开发的高性能电力铁塔角钢Q460TE的焊接特性进行了研究,并分析了其焊后材料的力学性能、组织及其焊缝硬度分布等。结果表明:角钢焊接后拉伸断裂位置处于母材,试样的屈服强度平均值为480 MPa,抗拉强度平均值为627 MPa,伸长率平均值为24.8%,其塑性变形能力较好;角钢焊缝区组织为铁素体,熔合线附近的母材组织为铁素体+少量珠光体,晶粒度大于11.5级,熔合线附近的焊接材料组织主要为铁素体,热影响区组织为铁素体+少量珠光体,晶粒度在5.0~5.5级之间;热影响区的硬度值最高,可达243.59 HV,焊缝区与基体处的硬度较低。
The welding characteristics of Q460TE, a high-performance electric power station, were studied and the mechanical properties, microstructure and weld hardness distribution of the post-weld material were analyzed. The results show that the tensile fracture location of the angle welded steel is base metal. The average yield strength of the sample is 480 MPa, the average tensile strength is 627 MPa, the average elongation is 24.8%, and the plastic deformation capacity is good. The weld zone of the angle steel is ferrite. The base metal near the weld line is ferrite + a small amount of pearlite. The grain size is greater than 11.5. The welding consumables near the weld line are mainly ferrite and heat affected zone For the ferrite + a small amount of pearlite, the grain size is between 5.0 and 5.5; the hardness of the heat affected zone is the highest, reaching 243.59 HV, and the hardness at the weld zone and the base is lower.