Tailored hot stamping and crash response of boron steels

该项目将解决超高强度汽车部件的制造和碰撞响应，这些部件具有通过热冲压硼钢制造的量身定做的特性。热冲压钢是在奥氏体(红热)状态下，在冷却模具内以足以引起马氏体相变的速度对材料进行淬火的快速成形钢。使用这种加工路线，强度可以达到1500兆帕以上，这使得这些部件非常适合用于汽车防撞结构碰撞安全部件，如保险杠梁。车门防撞梁、A柱和B柱、车顶和侧栏。目前的项目团队之前在最近完成的一个为期两年的NSERC-CRD项目中所做的工作，已经成功地开发出了具有定制特性的“实验室规模”的B柱。分段模具用于对单个模具分段进行选择性加热，最高可达400“C，从而允许在热冲压过程中局部控制淬火速率，从而控制成形零件内的局部性能。这种量身定制的部件在汽车行业引起了相当大的兴趣，因为它们将使部件具有局部高强度区域，以防止碰撞时的入侵，但具有可设计为提供一些能量吸收能力的较软区域。这个拟议的加拿大汽车合作伙伴项目将借鉴之前的CRD项目，开发具有优化能量吸收特性的定制热冲压部件。该项目将以实验和分析研究为特色，作为量身定制的烫印加工路线的概念验证。APC项目的活动将集中在开发一种多区域热冲压模具，该模具将生产适合在侧面冲击和轴向挤压载荷下进行机械测试和性能评估的热冲压部件。优化技术将与热冲压的有限元模拟相结合，为我们的工业合作伙伴提供部件和工艺设计工具，以开发高性能的结构碰撞部件。优化研究的结果将通过制造多区域热冲压模具来验证，以生产适合于冲击试验的部件规模的多区域热冲压。冲击试验将用于评估冲击性能，特别是确定零件的硬马氏体区和软贝氏体区之间的过渡区是否存在任何问题。

This project will address the fabrication and crash response of ultra-high strength automotive components with tailored properties fabricated through hot stamping of boron steels. Hot stamped steels are fabricated by rapidly forming steels in the austenitic (red hot) condition within cooled dies that quench the material at a rate sufficient to cause a martensitic phase transformation. Strengths in excess of 1,500 MPa can be achieved using this processing route making these components highly desirable for use in anti-intrusion structural crash safety components within automobiles such as bumper beams. door intrusion beams, A- and B-pillars, roof and side rails. Previous work by the current project team within a recently completed two-year NSERC-CRD project has been successful in developing a "laboratory-scale" B-pillar with tailored properties. A segmented die was used with selective heating of individual die segments up to 400"C thereby allowing local control of quench rates during hot stamping with resulting control over the local properties within the as-formed part. Such tailored parts are the subject of considerable interest within the automotive sector since they will enable components with local high strength regions to prevent intrusion during crash, but with softer regions that can be designed to provide some energy absorption capabilities. This proposed Automotive Partnership Canada project will pick up from the previous CRD project to develop a tailored hot stamped component with optimized energy absorption characteristics. This project will feature experimental and analytical research that will serve as proof of concept of the tailored hot stamping processing route. The APC project activity will centre on the development of a multi-zone hot stamping die that will produce a hot stamped component suitable for mechanical testing and performance evaluation under both side impact and axial crush load cased. Optimization techniques will be developed in conjunction with finite element simulation of hot stamping to provide component and process design tools for use by out industrial partners to develop high performance structural crash components. The output of the optimization study will be validated through fabrication of a multi-zone hot stamping die to produce a component-scale multi-zone hot stamping suitable for impact testing. The impact tests will serve to assess the impact performance, in particular, identifying any issues in the transition zone between the hard martensitic zone and the softer bainitic zone of the part.