Semi-hot Stamping as an Improved Process of Hot Stamping
Semi-hot Stamping as an Improved Process of Hot Stamping
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DOI：
10.1016/s1005-0302(11)60076-5
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发表时间：
2011-04-01
影响因子：
10.9
通讯作者：
Bleck, Wolfgang
中科院分区：
文献类型：
--
作者：
Naderi, Malek;Ketabchi, Mostafa;Bleck, Wolfgang
降低成形载荷、消除回弹、提高板材的成形性以及生产高强度零件是采用热冲压工艺的主要原因。热冲压工艺和22MnB5钢分别是最先进的工艺和牌号；然而，新颖的工艺和钢种正在考虑之中。在当前的研究中，对 MSW1200 钢种毛坯在半热冲压和全热冲压工艺下的行为进行了表征。在半热冲压过程中，毛坯首先被加热到约650摄氏度的温度，然后在模具组件中同时成型和淬火。研究了半热冲压和全热冲压毛坯的显微组织和力学性能，并将结果与普通水/空淬毛坯的结果进行了比较。热冲压毛坯的强度值与水淬毛坯一样高。半热冲压的毛坯具有最高的延展性和最佳的成形性。结论是，对于上述钢材，半热冲压工艺可以被视为一种改进的热机械工艺，它不仅保证了高成形性，而且还带来了超高的强度值。
Reducing the forming load, deletion of springback, increasing the formability of sheets as well as producing high strength parts are the main reasons to apply hot stamping process. Hot stamping process and 22MnB5 steels are the state of the art process and grades, respectively; however novel processes and steel grades are under considerations. In the current research, behavior of the steel grade MSW1200 blanks under semi and fully hot stamping processes was characterized. During semi-hot stamping process, the blank was firstly heated to a temperature of about 650 degrees C and then formed and quenched in the die assembly, simultaneously. Microstructure and mechanical properties of semi and fully hot stamped blanks were studied and the results were compared with those of normally water/air quenched blanks. The hot stamped blanks attained the strength values as high as water quenched blanks. The highest ductility and consequently, the best formability were achieved for the blank which had been semi-hot stamped. It was concluded that for the mentioned steel, semi-hot stamping process could be considered as an improved thermo-mechanical process which not only guaranteed a high formability, but also led to ultra high strength values.