| 高强度双相钢板拉弯成形断裂的微观组织形貌分析 |
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| 引用本文： | 何春锋,赵亦希,黄胜.高强度双相钢板拉弯成形断裂的微观组织形貌分析[J].上海交通大学学报,2014,48(5):618-623. |
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| 作者姓名： | 何春锋 赵亦希 黄胜 |
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| 作者单位： | (上海交通大学 上海市复杂薄板结构数字化制造重点实验室, 上海 200240) |
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| 基金项目： | 国家自然科学基金资助项目(51075267,51375308);国际科技合作项目(2010DFA72760) |
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| 摘 要： | 引入拉弯比来表征高强度双相钢板在不同凸模圆角半径下的拉弯应力状态,根据不同的拉弯比判定不同的成形断裂模式,在剪切断裂试验平台上进行双相钢板的拉弯试验,并对断裂试样的微观组织形貌进行分析.结果表明:高强度双相钢的剪切断裂属于韧性断裂;凸模圆角半径越小及板料强度越高,板料越容易发生剪切断裂.
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| 关 键 词： | 高强度双相钢 拉弯试验 剪切断裂 应力状态 微观组织 |
| 收稿时间： | 2013-08-02 |
Microstructural Study of Advanced High Strength Dual-Phase Steels Sheet Under Stretch-Bending Forming Process |
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| HE Chun-feng;ZHAO Yi-xi;HUANG Sheng.Microstructural Study of Advanced High Strength Dual-Phase Steels Sheet Under Stretch-Bending Forming Process[J].Journal of Shanghai Jiaotong University,2014,48(5):618-623. |
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| Authors: | HE Chun-feng;ZHAO Yi-xi;HUANG Sheng |
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| Institution: | (Shanghai Key Laboratory of Digital Manufacture for Thin walled Structures, Shanghai Jiaotong University, Shanghai 200240, China) |
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| Abstract: | Stretch bending is a typical method for sheet stamping forming. Different fracture failure modes occur on advanced high strength dual phase steel based on different stress state. For example, shear fracture occurs under tight radius stretch bending condition. In this paper, a stretch bending ratio α was introduced to indicate different stress states to determine the failure mode: necking or shear fracture. Stretch bending experiments of DP steels were conducted and fracture morphology was observed. The results show that shear fracture still belongs to ductile fracture, and tighter punch radius or higher DP strength leads to shear fracture much more easily.
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| Keywords: | high strength dual phase steel stretch bending experiment shear fracture stress state microstructure |
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