Solidification Structure and Abrasion Resistance of High Chromium White Irons
Superior abrasive wear resistance, combined with relatively low production costs, makes high Cr white cast irons (WCIs) particularly attractive for applications in the grinding, milling, and pumping apparatus used to process hard materials. Hypoeutectic, eutectic, and hypereutectic cast iron compositions, containing either 15 or 26 wt pct chromium, were studied with respect to the macrostructural transitions of the castings, solidification paths, and resulting microstructures when poured with varying superheats. Completely equiaxed macrostructures were produced in thick section castings with slightly hypereutectic compositions. High-stress abrasive wear tests were then performed on the various alloys to examine the influence of both macrostructure and microstructure on wear resistance. Results indicated that the alloys with a primarily austenitic matrix had a higher abrasion resistance than similar alloys with a pearlitic/bainitic matrix. Improvement in abrasion resistance was partially attributed to the ability of the austenite to transform to martensite at the wear surface during the abrasion process.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- U.S. Bureau of Mines (Work performed while the Albany Research Center was initially part of the US Bureau of Mines. ARC was transferred into DOE in 1996/97.)
- OSTI ID:
- 862413
- Report Number(s):
- DOE/ARC-1997-003; TRN: US200603%%55
- Journal Information:
- Metallurgical and Materials Transactions A, Vol. 28A, Issue 6; Related Information: Work performed while the Albany Research Center was initially part of the US Bureau of Mines. ARC was transferred into DOE in 1996/97.
- Publisher:
- TMS, 184 Thorn Hill Road, Warrendale, PA 15086-7514
- Country of Publication:
- United States
- Language:
- English
Similar Records
Columnar to equiaxed transition in high Cr white iron castings
Effect of chemical composition and superheat on macrostructure of high Cr white iron castings