1、3600 英文单词，英文单词，2 万英文字符万英文字符，中文中文 5750 字字 文献出处：文献出处：Naderi M, Ketabchi M, Abbasi M, et al. Semi-hot stamping as an improved process of hot stampingJ. Journal of Materials Science however novel processes and steel grades are under considerations. In the current research, behavior of the steel grade MS
2、W1200 blanks under semi and fully hot stamping processes was characterized. During semi-hot stamping process, the blank was fi rstly heated to a temperature of about 650C and then formed and quenched in the die assembly, simultaneously. Microstructure and mechanical properties of semi and fully hot
3、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 se
4、mi-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. KEY WORDS: Semi-hot stamping; Hot stamping; MSW1200 steel; M
5、echanical properties 1. Introduction To optimize the fuel consumption of cars, the weight reduction of cars is intensively required in the automobile industry. Hence, application of high strength steel sheets in automobile bodies would be a good solution to reduce the weight of cars1. However, the u
6、se of high strength steel sheets usually leads to some disadvantages like high impact on the tools, reduced formability and the increased tendency to springback2. To improve the formability characteristic and reduce or avoid the springback of high strength steel sheets, hot stamping process has been used widely. During this process, not only the fl ow stress is largely reduced by preheating the sheets, but also due to simultaneous occurrence of forming and quenching, forming load and s
