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首页> 外文会议>International Conference on Material Science and Engineering >Investigation on Process and Welded Joint Mechanical Properties of Bainitic Steel Rail Flash Butt Welding
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Investigation on Process and Welded Joint Mechanical Properties of Bainitic Steel Rail Flash Butt Welding

机译：贝氏体钢轨道闪光焊接工艺和焊接接头机械性能研究

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摘要

Combine with the characteristics of bainitic rail U20Mn2SiCrNiMo, the flash butt welding process that suitable bainitic rail is optimized for improving bainitic joints' performance basing on the mature technology of pearlitic rail flash butt welding, through approaches of lower heat input appropriate and matched upset forging length parameters, et. In the post welding treatment, controlling the heating process strictly and using slow cooling measures are done to further optimize the properties of the welded joints. Then the performance tests are done on the bainitic rail joints welded with optimized welding and post welding process. The study results approve that the qualified bainitic rail joints can be obtained through appropriate flash butt welding process. Tensile strength and impact energy of bainitic joints are superior to pearlitic rail joints, but the elongation is reverse. The impact fracture of bainitic rail flash welded joints appears more defects such as hot cracks and silicate inclusions than pearlitic joints. Compared with parent metal, both types of the rail joints appear higher strength, but lower elongation and impact energy. The decreased percentage of bainitic rail joints compared with their parents is larger than pearlitic joints.
机译：结合贝氏体轨道U20MN2SICRNIMO的特点，闪光对接焊接过程优化了改善贝氏体关节的性能，以改善珠光体闪光对接焊接成熟技术，通过较低热输入的方法合适和匹配的镦粗锻造长度参数等。在焊接后处理，严格控制加热过程并采用缓慢的冷却措施，以进一步优化焊接接头的性质。然后在用优化的焊接和后焊接过程焊接的贝氏体轨道接头上完成性能测试。该研究结果批准了通过适当的闪光对接焊接过程可以获得合格的贝氏体轨道接头。贝氏体关节的拉伸强度和冲击能量优于珠光体轨道，但伸长率是反向的。贝氏体轨道闪光焊接接头的冲击骨折看起来更缺陷，例如比珠光体关节的热裂缝和硅酸盐夹杂物。与母金属相比，两种类型的轨道接头显得更高，但伸长率较低，抗冲击能量。与父母相比，贝氏体轨道关节的百分比减少大于珠光节关节。

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