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Inflatable Side Impact Beams in Martensitic Steel

机译：马氏体钢中充气侧冲击梁

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In automotive design, higher safety requirements, lower weight and CO 2 emissions, and compact design, all speak for the use of ultra high strength steels. But still today there is a lot of caution when such steels are used, due to presumed lack of formability and the ductility in the material after forming. In the current paper, a design in the ultra high strength steel Docol 1200 M will be shown, which clearly shows the potential in terms of safety and compact design when using such steels, but also the formability and ability to withstand deformations in a crash situation of the steel involved. The application is an inflatable side impact beam for a passenger vehicle. The inflatable side impact beam is a compact module made of thin walled metal and pyrotechnics comparable to the ones used for airbag application. Within a few milliseconds, inflation causes thin walled metal to deform/expand and the pressure to increase up to 20bar inside the structure. Larger cross-section beam provides then similar or higher impact performance and increased protection of occupant with lower weight. The material used for the structure is Docol 1200 M, an ultra high strength cold rolled martensitic steel. The steel, which is delivered in quenched condition, has a minimum tensile strength of 1200 MPa, and is cold formed to the structure shown in picture below. The part was formed to the final shape in two forming step, after which it was assembled with the bottom part with the pyrotechnics inside. Details of the forming process are given in the paper. The application shows the possibilities which exist when new thinking is combined with new, ultra high strength steel grades.
机译：在汽车设计，安全要求较高，重量和二氧化碳排放量和紧凑的设计中，所有都可以使用超高强度钢。但是，今天仍然存在很多小心，因为在形成后的缺乏缺乏成形性和材料中的延展性时，存在很多警告。在目前的纸张中，将显示超高强度钢DOCOL 1200M的设计，在使用这种钢时，清楚地显示了安全性和紧凑的设计方面的潜力，也可以在碰撞情况下承受变形的可成形性和能力涉及的钢。该应用是乘用车的可充气侧冲击梁。充气侧冲击梁是由薄壁金属和烟火制成的紧凑型模块，与用于安全气囊应用的烟火相当。在几毫秒内，通货膨胀导致薄壁金属变形/膨胀，压力在结构内增加20bar。较大的横截面梁提供类似或更高的冲击性能，并增加重量较低的乘员的保护。用于该结构的材料是DOCOL 1200M，超高强度冷轧马氏体钢。在淬火条件下递送的钢具有1200MPa的最小拉伸强度，并且冷却至下图所示的结构。该部件形成为两个成形步骤中的最终形状，之后将其与底部组装在其中内部的底部。在纸上给出了成形过程的细节。该应用表明了新思维与新的超高强度钢等级相结合时存在的可能性。

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