Metallurgical behavior of grain refined 5 % Mn-2 % Si-0.05 % Nb AHSS

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• 作者：Hiroshi TakechiShiro TorizukaToshihiro HanamuraKazuo Namba
• 会议时间：2013-06-01
• 关键词：martensitic steel ; TRIP steel ; fine grained steel ; tensile strength-elongation balance ; tensile strength-notch toughness balance ; local elongation
• 作者单位：Hiroshi Takechi(Fellow,Society of Automotive Engineers of Japan Inc,)Shiro Torizuka,Toshihiro Hanamura(National Institute for Materials Science of Japan)Kazuo Namba(T - TEK International Co.)
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

Requirement on the weight saving of automobiles has further been energetic for global environment and for saving natural resources.The steel which has tensile strength ( TS) more than 1,000 MPa and TS multiplied by total elongation ( El) TS × El is more than 30 000 MPa ·% ( El type) has been studied.By taking other applications into consideration,better notch toughness has also been studied ( Toughness type).TRIP steel seems to be better for El type and grain refined Martensite based steel ( M steel) is better for Toughness type.Mn can stabilize Austenite ( γ) during cooling from γ area as Retained Austenite ( γR ) and can lower Ms temperature.Grain refining prior to Austenite→Martensite ( γ→M),Austenite→Retained Austenite ( γ→γR ) and Austenite→Bainite ( γ→β) should be effective to modify transformation behavior and transformed structure.Middle Mn steel having 5 % Mn with 0.05 % Nb and hot control-rolled was studied by changing C content and the condition of heat treatment after rolling.TRIP steel having TS.El≥30 000 MPa · % and M steel having Absorbing Energy ( AE) at - 100℃ of 8.2 Joule,and 50% FATT of -70 ~ -90℃ were obtained.