文中通过多种检测方法对Φ508 mm×8.0 mm R=6D IB415感应加热弯管外弧侧鼓包原因进行了分析,结果表明,在鼓包处对应管体内表面存在机械损伤缺陷,该部位组织晶粒度较其他部位严重粗化,屈服强度超过标准上限,夏比冲击韧性明显降低。...文中通过多种检测方法对Φ508 mm×8.0 mm R=6D IB415感应加热弯管外弧侧鼓包原因进行了分析,结果表明,在鼓包处对应管体内表面存在机械损伤缺陷,该部位组织晶粒度较其他部位严重粗化,屈服强度超过标准上限,夏比冲击韧性明显降低。通过管道承载能力分析可以推测,该鼓包的产生是由于钢管内表面存在机械损伤致使管体壁厚减薄,在母管静水压试验时损伤部位产生局部鼓包缺陷,在随后的感应加热弯制过程中由于鼓包位置与感应线圈距离较近使得该区域温度异常升高,最终使得该区域的强韧性明显降低。展开更多
This work particularly focuses on compensating Joule heat in under-heated areas occurred when thin steel bar is(<20 mm)heated by transverse flux induction heater(TFIH).The under-heated areas take place in range of ...This work particularly focuses on compensating Joule heat in under-heated areas occurred when thin steel bar is(<20 mm)heated by transverse flux induction heater(TFIH).The under-heated areas take place in range of 50~150 mm from the both edges,so Transverse Flux Induction Coil(TFIC)including a magnetic core is proposed and optimized to supplement this fault.The solutions on the electromagnetic field are obtained numerically by commercial code MAXWELL 3D software from ANSYS Corp.and then,verified experimentally by pilot-scale tests,in which the TFIH was manufactured with a nominal power of 100 kW at a fundamental frequency of 1 kHz.Ultimately,TFIC having geometrically the optimized magnetic core made the heating pattern U-shaped,so could supply a desirable temperature profile for the rolling process.展开更多
文摘文中通过多种检测方法对Φ508 mm×8.0 mm R=6D IB415感应加热弯管外弧侧鼓包原因进行了分析,结果表明,在鼓包处对应管体内表面存在机械损伤缺陷,该部位组织晶粒度较其他部位严重粗化,屈服强度超过标准上限,夏比冲击韧性明显降低。通过管道承载能力分析可以推测,该鼓包的产生是由于钢管内表面存在机械损伤致使管体壁厚减薄,在母管静水压试验时损伤部位产生局部鼓包缺陷,在随后的感应加热弯制过程中由于鼓包位置与感应线圈距离较近使得该区域温度异常升高,最终使得该区域的强韧性明显降低。
文摘This work particularly focuses on compensating Joule heat in under-heated areas occurred when thin steel bar is(<20 mm)heated by transverse flux induction heater(TFIH).The under-heated areas take place in range of 50~150 mm from the both edges,so Transverse Flux Induction Coil(TFIC)including a magnetic core is proposed and optimized to supplement this fault.The solutions on the electromagnetic field are obtained numerically by commercial code MAXWELL 3D software from ANSYS Corp.and then,verified experimentally by pilot-scale tests,in which the TFIH was manufactured with a nominal power of 100 kW at a fundamental frequency of 1 kHz.Ultimately,TFIC having geometrically the optimized magnetic core made the heating pattern U-shaped,so could supply a desirable temperature profile for the rolling process.
