The aim of this work is to investigate the mechanical properties and microstructures of friction-stir welded(FSWed) St52 structural steel joints. In this study, St52 steel plates with a thickness of 4 mm were butt-wel...The aim of this work is to investigate the mechanical properties and microstructures of friction-stir welded(FSWed) St52 structural steel joints. In this study, St52 steel plates with a thickness of 4 mm were butt-welded by friction-stir welding(FSW) using a tungsten carbide tool having a conical pin. The microstructure of the welded zone consists of equiaxed fine ferrite, grain boundary ferrite, Widmanstatten ferrite, and aggregates of ferrite + cementite. The microhardness measurements showed that the hardness of the welded zone was significantly higher than that of the base metal. The FSWed St52 joint exhibited a significant strength overmatching in the weld region and a strength performance similar to or slightly higher than that of the base plate.展开更多
选取了Q345B、CM490作为St52-3Mod的备选材料,通过对这两种材料经不同参数的热处理试验后,进行了力学性能分析,判定以上这两种材料能否替代标准号为DIN EN 10025-2中的St52-3Mod材料。结果表明:Q345B、CM490这两种材料的力学性能与标准D...选取了Q345B、CM490作为St52-3Mod的备选材料,通过对这两种材料经不同参数的热处理试验后,进行了力学性能分析,判定以上这两种材料能否替代标准号为DIN EN 10025-2中的St52-3Mod材料。结果表明:Q345B、CM490这两种材料的力学性能与标准DIN EN 10025-2中的St52-3Mod材料有较大的差异,因此,选择普通的Q345B或CM490材料替代St52-3Mod材料存在很大的风险,此试验过程对寻找替代材料具有借鉴意义。展开更多
文摘The aim of this work is to investigate the mechanical properties and microstructures of friction-stir welded(FSWed) St52 structural steel joints. In this study, St52 steel plates with a thickness of 4 mm were butt-welded by friction-stir welding(FSW) using a tungsten carbide tool having a conical pin. The microstructure of the welded zone consists of equiaxed fine ferrite, grain boundary ferrite, Widmanstatten ferrite, and aggregates of ferrite + cementite. The microhardness measurements showed that the hardness of the welded zone was significantly higher than that of the base metal. The FSWed St52 joint exhibited a significant strength overmatching in the weld region and a strength performance similar to or slightly higher than that of the base plate.
文摘选取了Q345B、CM490作为St52-3Mod的备选材料,通过对这两种材料经不同参数的热处理试验后,进行了力学性能分析,判定以上这两种材料能否替代标准号为DIN EN 10025-2中的St52-3Mod材料。结果表明:Q345B、CM490这两种材料的力学性能与标准DIN EN 10025-2中的St52-3Mod材料有较大的差异,因此,选择普通的Q345B或CM490材料替代St52-3Mod材料存在很大的风险,此试验过程对寻找替代材料具有借鉴意义。