| 引用本文: | 周杰,李世云,石彧,冉云兰,黄治勇,李慧.超高强度钢BR1500HS热冲压的热力耦合分析及实际应用[J].材料科学与工艺,2013,21(5):95-101.DOI:10.11951/j.issn.1005-0299.20130516. |
| ZHOU Jie,LI Shi-yun,SHI Yu,RAN Yun-lan,HUANG Zhi-yong,LI Hui.Thermo-mechanical coupled analysis and practical application of hot stamping of the ultra high strength steel BR1500HS[J].Materials Science and Technology,2013,21(5):95-101.DOI:10.11951/j.issn.1005-0299.20130516. |
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| 摘要: |
| 为了建立超高强度钢BR1500HS热冲压有限元模型,采用Gleeble1500热模拟机对超高强度钢的高温流变行为及其高温下的力学性能进行测定,获得了该材料在0,0,0,0,900 ℃的真实应力-应变曲线,并测得BR1500HS在不同应变速率(0.1、0.01 s-1)下的高温流动性能数据。数值分析结果表明,板料减薄率最大预测值为22.53%,在允许范围内。在800～500 ℃内,板料平均冷却速率约为100 ℃/s,大于临界冷却速率,奥氏体将进行非扩散转变。通过对板料热冲压成形前后的微观组织的观察,证实了马氏体转变的事实。 |
| 关键词: 热冲压 超高强度钢 热力性能 流动特性 有限元分析 |
| DOI：10.11951/j.issn.1005-0299.20130516 |
| 分类号: |
| 基金项目:重庆市自然科学基金重点资助项目(CSTC2009BA4065). |
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| Thermo-mechanical coupled analysis and practical application of hot stamping of the ultra high strength steel BR1500HS |
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ZHOU Jie,LI Shi-yun,SHI Yu,RAN Yun-lan,HUANG Zhi-yong,LI Hui
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(College of Material Science and Engineering, Chongqing University, Chongqing 400044, China)
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| Abstract: |
| To establish a finite element model for hot stamping of ultra high strength steel (UHSS) BR1500HS, the thermo-mechanical material characteristics and the flow behavior of UHSS at elevated temperature was measured on Gleeble1500 thermo-mechanical simulator. The stress-strain curves at 0,0,0,0,900 ℃ and the strain rate of 0.1 and 0.01 s-1 were achieved. Numerical results show that the largest sheet metal thinning rate was 22.53%, in the allowable range. From 800 ℃ to 500 ℃, the average cooling rate is 100 ℃/s, which is greater than the critical cooling rate. The austenite transformation is diffusion transformation. By watching the microstructure of plates before and after hot stamping, the martensite transformation is confirmed. |
| Key words: hot stamping ultra high strength steel thermo-mechanical properties flow behavior Finite Element Analysis |
