Method of hot-shaping and hardening a sheet steel blank
OwnerKatarina Eriksson, Jan Larssoninventors
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Abstract
A sheet steel blank is heated to the austenite range and formed in a cooled tool pair that rapidly cools the formed product until the product's temperature drops somewhat below the temperature Ms for the start of the formation of martensite. The cooling is rapidly interrupted and the product's temperature is raised until it exceeds Ms and is maintained there until the material comes to contain more than 50% by volume bainite. The short time under the Ms temperature favours the formation of bainite and shortens the holding time.
Claims18
A method of hot shaping and hardening a sheet steel blank by forming the blank, heated to the austenite range, in a tool pair that rapidly cools the formed product,
- characterized in
- that the formed product is cooled until the product's temperature drops below the temperature for the start of the formation of martensite, Ms, and the product's temperature is then raised until it exceeds the temperature for the start of the formation of martensite and is maintained hot so that bainite is formed.
Dependencies are inferred from the claim text.