Development of Niobium Alloyed Press （铌合金媒体的发展）.pdfVIP

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2017-09-02 发布于浙江
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Development of Niobium Alloyed Press （铌合金媒体的发展）.pdf

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Development of Niobium Alloyed Press （铌合金媒体的发展）

Development of Niobium Alloyed Press Hardening Steel with Improved Properties for Crash Performance 1 2 3 4 4 Jian Bian , Wang Li , Hardy Mohrbacher , Lu Hongzhou and Wang Wenjun 1 Niobium Tech Asia, 068898 Singapore 2 Baosteel Corporation, Shanghai 201900, China 3NiobelCon bvba, 2970 Schilde, Belgium 4CITIC Metal Co.,Ltd, Beijing 100004, China 1 2 3 jian.bian@ , lwang@, hm@ 4hongzhoulu@, 4wangwj3@ Key words: martensitic steel, toughness, bendability, hydrogen induced delayed cracking, crash performance, Nb microalloying. Abstract Press hardening steel has become a much used material in car body manufacturing due to its excellent safety and lightweight potential. In some recent car models press hardening steel has reached already a weight share of more than 20% in the body structure while it is estimated that it could reach even around 40% in the future. However conventional press hardening steel based on the alloying concept 22MnB5 was designed originally not for automotive application. In spite of the high strength level, press hardening steel has generally low toughness due to the relatively high carbon content and its martensitic microstructure. Particularly important is the ductile-to-brittle transition temperature at low temperature, which might lead to unexpected failure in cold climate regions. Furthermore, hydrogen embrittlement is a major concern in press hardening s