Cast iron alloy for automotive engine applications with superior high temperature oxidation properties

US11667995B2 · kind B2 · utility

Assignees

• Ford Global Technologies, LLC · US
• The Curators of the University of Missouri · US

Inventors

• Larry Alan Godlewski · Fenton, US
• Mei Li · Canton, US
• Carlos Engler-Pinto · Dearborn, US
• Simon Lekakh · Rolla, US

Key dates

• Filing date: Sep 21, 2021
• Grant date: Jun 6, 2023
• Expiry date: Sep 21, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C37/04
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A cast iron alloy is provided with a composition in weight percent (wt. %) of carbon between 2.6 to 3.4 wt. %, silicon between 2.4 to 3.2 wt. %, manganese between 0.3 to 0.6 wt. %, molybdenum between 0.4 to 1.2 wt. %, nickel between 0.6 to 1.75 wt. %, magnesium between 0.01 to 0.075 wt. %, aluminum between 1.8 to 3.5 wt. %, sulfur between 0.003 to 0.025 wt. %, zirconium between 0.001 to 0.02 wt. %, cerium between 0.001 to 0.03 wt. %, lanthanum between 0.0005 to 0.02 wt. %, and a balance of iron and unavoidable trace elements. A part formed from the cast iron alloy is also provided and the part has an Ac1 temperature equal to or greater than 895° C. and a thermo-mechanical fatigue lifetime of at least 10,000 cycles when cycled between 400° C. to 800° C. with a total cyclic strain equal to 0.001 m/m.