A new austenitic alumina forming alloy: aluminium-coated FeNi32Cr20

• Published in: Protective Systems for High Temperature Applications - From Theory to Industrial Implementation: (EFC 57) Vol. 57; pp. 122 - 133
• Main Authors: Hattendorf, Heike, Kolb-Telieps, Angelika, Hojda, Ralf, Naumenko, Dmitry
• Format: Book Chapter
• Language: English
• Published: United Kingdom CRC Press 2011; Maney Publishing; Taylor & Francis Group
• Edition: 1
• Subjects: Corrosion; Materials science; Metals & Metallurgy; Oxidation Resistance; Mass Gain Measurements; Recrystallisation Treatment; Alumina Scale; Oxide Spallation; Scale Thickness; Intermediate Thickness; Intermetallic Ni Al Phase; Protective Alumina Scale; Cold Rolling; Excellent Oxidation Resistance; Ingot Melting; Protective Aluminium Oxide Layer; Similar Yield Strengths; Hot Tensile Tests; FeCrAl Alloy; Hot Rolling; Sample A1; Sample N2; Μm Foils; Aluminium Content; In-Lens Detection; Austenitic Alloy; Oxide Scale; Sample P1
• ISBN: 9781906540357; 1906540357; 9781138116368; 113811636X
• DOI: 10.1201/9781003421498-11

Foils of FeCrAl alloys are used as a substrate in metal-supported automotive catalytic converters. FeCrAl alloys owe their excellent oxidation resistance at high temperature to a slow-growing α-Al2O3 scale. Increasing exhaust gas temperatures demand improved high-temperature mechanical properties in addition to oxidation resistance. To avoid these problems, foils of an austenitic FeNiCr alloy with an aluminium content higher than 6% can be produced by coating an FeNiCr alloy with pure aluminium, for example by cladding at intermediate thickness followed by cold rolling and diffusion annealing. Hot tensile tests were carried out on different heats/trials of conventional FeCrAl, and coated FeCrAl and FeNiCrAl at temperatures up to 1100 °C.