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Different types of steel employing the Transformation Induced Plasticity (TRIP) mechanism were tested for high tensile strength, with a view to improving passenger safety and reducing vehicle weight in the automotive industry. Using a Transverse Flux (TFX) simulator and a direct resistance heating simulator, the steels were subjected to continuous annealing cycles to produce a range of structures with varying proportions of ferrite, bainite, martenite and austenite,. By varying the annealing temperatures and the cooling ranges, an increase in high tensile strength and ductility was achieved. The results indicate that it will be difficult to produce these high ductility steels at tensile strengths much higher than 1000N/mm² due to the high levels of carbon, manganese and silicon which would be required. Instead, the use of lower slow cooling temperatures - to introduce significant amounts of martensite - could produce ultra high strength steels where moderate ductility is sufficient

Additional information

Authors: EVANS P J, British Steel plc, London (GB)
Bibliographic Reference: EUR 18603 EN (1998) 149pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4996-1
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