Transformation induced plasticity （TRIP） and twinning induced plasticity （TWlP） effects had been widely studied in single austenite steel. But in duplex γ ＆ α（δ） phase, such as welding materials of stainles...Transformation induced plasticity （TRIP） and twinning induced plasticity （TWlP） effects had been widely studied in single austenite steel. But in duplex γ ＆ α（δ） phase, such as welding materials of stainless steel, they had been less studied. Tensile shear loading experiment of resistance spot welding specimens prepared with 2 mm 301L sheets, was carried out at 15℃ and -50℃. Optical microscopy and scanning electron microscopy （SEM） as well as X-ray diffraction （XRD） were used to investigate the microstructure of weld nugget, and specimens fracture surface. The results showed that the initial weld nugget was composed of 8.4% α（δ） ferrite and 91.6% austenite. Tensile shear load bearing capacity of spot welding specimen at -50℃ was 24.8 kN, 17.7% higher than that at 15℃. About 78.5 vol. pct. martensite transformation was induced by plastic deformation at -50℃, while about 67.9 vol. pct transformation induced at 15℃. The plasticity of spot welding joint decreased with the decline of experimental temperature.展开更多
利用金相分析、力学性能测试、显微硬度分析、Image Pro Plus马氏体覆盖分析和J-Matpro性能模拟预测分析对冷拔原材料和冷拔变形后断裂的301奥氏体不锈钢进行全面分析。分析结果表明:发生断裂的根本原因是形变诱导发生相变而产生马氏体...利用金相分析、力学性能测试、显微硬度分析、Image Pro Plus马氏体覆盖分析和J-Matpro性能模拟预测分析对冷拔原材料和冷拔变形后断裂的301奥氏体不锈钢进行全面分析。分析结果表明:发生断裂的根本原因是形变诱导发生相变而产生马氏体,马氏体强度高、硬度高、塑性低,因此在冷拔变形力的作用下容易发生断裂。经过1 080℃保温60 min的固溶处理后,发生相变的组织重新回复到晶粒度6.0级的奥氏体组织,同时其强度、硬度降低,延伸率提高。展开更多
文摘Transformation induced plasticity （TRIP） and twinning induced plasticity （TWlP） effects had been widely studied in single austenite steel. But in duplex γ ＆ α（δ） phase, such as welding materials of stainless steel, they had been less studied. Tensile shear loading experiment of resistance spot welding specimens prepared with 2 mm 301L sheets, was carried out at 15℃ and -50℃. Optical microscopy and scanning electron microscopy （SEM） as well as X-ray diffraction （XRD） were used to investigate the microstructure of weld nugget, and specimens fracture surface. The results showed that the initial weld nugget was composed of 8.4% α（δ） ferrite and 91.6% austenite. Tensile shear load bearing capacity of spot welding specimen at -50℃ was 24.8 kN, 17.7% higher than that at 15℃. About 78.5 vol. pct. martensite transformation was induced by plastic deformation at -50℃, while about 67.9 vol. pct transformation induced at 15℃. The plasticity of spot welding joint decreased with the decline of experimental temperature.
文摘利用金相分析、力学性能测试、显微硬度分析、Image Pro Plus马氏体覆盖分析和J-Matpro性能模拟预测分析对冷拔原材料和冷拔变形后断裂的301奥氏体不锈钢进行全面分析。分析结果表明:发生断裂的根本原因是形变诱导发生相变而产生马氏体,马氏体强度高、硬度高、塑性低,因此在冷拔变形力的作用下容易发生断裂。经过1 080℃保温60 min的固溶处理后,发生相变的组织重新回复到晶粒度6.0级的奥氏体组织,同时其强度、硬度降低,延伸率提高。
