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
介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经...介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。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.
文摘介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。
