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Title: The Effect of Silicon and Aluminum Additions on the Oxidation Resistance of Lean Chromium Stainless Steels

The Effect of Silicon and Aluminum Additions on the Oxidation Resistance of Lean Chromium Stainless Steels The effect of Si and Al additions on the oxidation of lean chromium austenitic stainless steels has been studied. A baseline composition of Fe-16Cr-16Ni-2Mn-1Mo was selected to allow combined Si and Al additions of up to 5 wt. pct. in a fully austenitic alloy. The baseline composition was selected using a net Cr equivalent equation to predict the onset of G-ferrite formation in austenite. Cyclic oxidation tests in air for 1000 hours were carried out on alloys with Si only or combined Si and Al additions in the temperature range 700 C to 800 C. Oxidation resistance of alloys with Si only additions were outstanding, particularly at 800 C. It was evident that different rate controlling mechanisms for oxidation were operative at 700 C and 800 C in the Si alloys. In addition, Si alloys pre-oxidized at 800 C, showed a zero weight gain in subsequent testing for 1000 hours at 700 C. The rate controlling mechanism in alloys with combined Si and Al addition for oxidation at 800 C was also different than alloys with Si only. SEM and ESCA analysis of the oxide films and base material at the oxide/base metal interface were conducted to study potential rate more » controlling mechanisms. « less
Authors: ; ;
Publication Date:
OSTI Identifier:803216
Report Number(s):DOE/ARC-2001-006
ORNL/TM-2001/174 (entire proceedings); TRN: US200411%%742
Resource Type:Conference
Data Type:
Resource Relation:Conference: Proceedings of the 15th Annual Conference on Fossil Energy Materials, Knoxville, TN (US), 04/30/2001--05/02/2001; Other Information: Supercedes report DE00803216; PBD: 1 Sep 2001
Research Org:Albany Research Center, OR (US)
Sponsoring Org:US Department of Energy; USDOE Office of Fossil Energy (FE) (US)
Country of Publication:United States
Language:English
Subject: 20 FOSSIL-FUELED POWER PLANTS; 36 MATERIALS SCIENCE; 42 ENGINEERING; AIR; ALLOYS; ALUMINIUM; AUSTENITE; CHROMIUM; OXIDATION; OXIDES; SILICON; STAINLESS STEELS; TESTING OXIDATION RESISTANCE; STAINLESS STEEL; SILICON; ALUMINUM