Thermal oxidation resistant surface alloys processed by laser alloying on Z38CDV5 ferritic steel

✍ Scribed by Enori Gemelli; Alain Galerie; Marcel Caillet

• Book ID: 104296455
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 516 KB
• Volume: 95
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00582-6

✦ Synopsis

New surface alloys were obtained on a low alloyed ferritic steel (Fe-O.38 C-5 Cr-1 Si-0.8 MO-0.5 V) by laser processing after coating the surface with chromium carbide powder. Three different microstructures were observed depending on irradiation conditions: hypoeutectic, eutectic and hypereutectic, all containing iron solid solutions (austenite and martensite) and iron-chromium carbides (Fe, Cr),C,. The oxidation resistance of these alloys was measured in isothermal and cyclic conditions, and was shown to increase with chromium concentration.

The hypereutectic alloy, containing 35% Cr. was particularly resistant due to the formation of a chromia scale with excellent behaviour during thermal shocks.