Patent ID: 7540403
Filing Date: 2009-06-02
Classification: B23K,C23C

Abstract:
1. A method for forming a metallic overlay comprising: supplying a metal substrate with a thermal expansion coefficient “X”; supplying a metallic alloy, which has a thermal expansion coefficient “Y”, wherein said metallic alloy has a coefficient of thermal expansion “Y” greater than 15% of that of said substrate “X” and wherein Fe and Cr comprises at least 90 wt % of said metallic alloy, and Mo is present at levels of about 1.0 to 2.0 wt %; melting said metallic alloy and applying said metallic alloy to said metal substrate to form an alloy/substrate interface; forming metallurgical bonds between said metallic alloy and said substrate at said alloy/substrate interface; and causing said alloy to shrink while said alloy is constrained at said alloy/substrate interface thereby developing a residual compressive stress in said metallic alloy.