Manufacturing guidelines when using ultra high strength steels in automotive applications
High strength and ultra high strength steels are increasingly being used in the automotive industry. A Jack of understanding as to how they behave compared with tradition al materials has led to the need for guidelines for their use. To this end several key manufacturing areas were investigated. These are joining, welding, forming, springback, fatigue and crash performance. Numerous tests were carried out on steel of various strengths and thicknesses. The following general conclusions were established. UHSS is readily weldable and it can be mechanically joined, although some limitations apply. Forming these materials caused numerous problems, which were amplified as the strength levels increased. Some forming techniques can alleviate these problems in simpler components. High levers of springback were noticed. This causes problems with the accuracy of computer simulations. There is a general improvement in the fatigue performance as the strength of the base metal is increased. High strength materials are able to absorb higher amounts of energy in crash testing. In summary, HS and UHS steel grades can be used in the manufacture of automotive components as a substitute for tradition al materials, although not exclusively and not in ail cases. Where these materials are used, care must be taken, throughout the manufacturing process, to ensure successful components are produced.
Bibliographic Reference: EUR 21909 EN (2005), 308pp. Euro: 45
Availability: Katalogue Number: KI-NA-21909-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 92-79-00139-6
Record Number: 200618556 / Last updated on: 2006-04-28
Original language: en
Available languages: en