Patent ID: 6818080
Filing Date: 2004-11-16
Classification: B22D,C22C,C22F

Abstract:
A method of manufacturing a shaped light metal article, comprising the steps of:performing a pre-plastic working heat treatment on an article for plastic working to produce blisters in a surface thereof due to expansion of gas included therein, the pre-plastic working heat treatment being performed at a temperature in a range of 350 to 450Â° C. for between 16 and 20 hours, and the article for plastic working being made of light metal material and including internal defects wherein the internal defects are no more than 10% of a volume thereof; forming a plastic worked article by plastic working the article for plastic working of which the blisters are produced in the surface; and subjecting the plastic worked article to a post-plastic working heat treatment at a temperature in a range of 250 to 400Â° C. for between 20 minutes and 5 hours.