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| 高强钢分区热冲压U形件梯度性能 |
| Gradient Properties of High Strength Steel U Shape Parts with Partition Hot Stamping |
| Received:October 15, 2016 Revised:November 10, 2016 |
| DOI：10.3969/j.issn.1674-6457.2016.06.008 |
| 中文关键词: 高强钢 分区热冲压 梯度性能 显微硬度 |
| 英文关键词: high-strength steel partition hot stamping gradient property microhardness |
| 基金项目:山东省重点研发计划(2015GGX103008) |
| Author Name | Affiliation | | ZHOU Wei-jia | School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China | | LIU Hong-wei | School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China | | YE Zhi-chun | School of Automotive Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China | | ZHAO Hong-yun | School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China |
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| 中文摘要: |
| 目的 为了提高热冲压件的碰撞安全性能，获得具有性能梯度的高强钢热冲压件。方法 设计了U形件分区控温热冲压模具装置，采用数值模拟的方法，分析了热区模具温度对成形件温度场、组织及硬度分布规律，并对梯度性能热冲压件进行硬度实验分析。结果 U形件冷区马氏体的体积分数大于95%，随着冷热模具温差增大，冷热区硬度及马氏体含量的差异也越大，冷模部分平均硬度在HV450左右，而模具温度为500 ℃区域平均硬度约为HV240，过渡区宽度约为60 mm。结论 采用模具分区控温的方法，实现了热冲压U形件梯度性能。 |
| 英文摘要: |
| The work aims to improve crash safety of hot stamping parts and obtain high-strength steel hot stamping parts of property gradient. A hot stamping die device with partition temperature control was developed. The distribution rules of temperature field, microstructure and hardness were analyzed by means of numerical simulation method. In addition, the hardness experimental analysis was conducted for the hot stamping parts of gradient property. Average martensite content of U-shape parts in cooled area was more than 95%. With the increase of temperature difference between cooled and heated dies, the difference between martensite content and hardness in cooled and heated areas increased. The average hardness of U-shape sample in cooled area was about HV450 while that with die temperature of 500 ℃ was nearly HV240. The width of hardness transition region was about 60 mm. The gradient property of the U-shape hot stamping parts is realized by partition temperature control of dies. |
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