Correlation of microstructure with the wear resistance and fracture toughness of duocast materials composed of high-chromium white cast iron and ... View Full Text


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Article Info

DATE

2001-03

AUTHORS

Hongsug Oh, Sunghak Lee, Jaeyoung Jung, Sangho Ahn

ABSTRACT

The objective of this study is to investigate the correlation of microstructure with wear resistance and fracture toughness in duocast materials that consisted of a high-chromium white cast iron and a low-chromium steel as the wear-resistant and ductile parts, respectively. Different shapes, sizes, volume fractions, and distributions of M7C3 carbides were employed in the wear-resistant part by changing the amount of chromium and molybdenum. In the alloys containing a large amount of chromium, a number of large hexagonal-shaped primary carbides and fine eutectic carbides were formed. These large primary carbides were so hard and brittle that they easily fractured or fell off from the matrix, thereby deteriorating the wear resistance and fracture toughness. In the alloys containing a smaller amount of chromium, however, a network structure of eutectic carbides having a lower hardness than the primary carbides was developed well along solidification cell boundaries and led to the improvement of both wear resistance and toughness. The addition of molybdenum also helped enhance the wear resistance by forming additional M2C carbides without losing the fracture toughness. Under the duocasting conditions used in the present study, the appropriate compositions for wear resistance and fracture toughness were 17 to 18 pct chromium and 2 to 3 pct molybdenum. More... »

PAGES

515-524

References to SciGraph publications

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  • 1988-07. Microstructural characterization of tungsten carbide hard-facing weld deposit in JOURNAL OF MATERIALS SCIENCE LETTERS
  • 1994-10. Microstructural analysis of fracture toughness variation in 2XXX-series aluminum alloy composites reinforced with SiC whiskers in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1997-01. Correlation of microstructure and fracture toughness in three high-speed steel rolls in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1991-10. A thermodynamic assessment of the Fe-Cr-Ni-C system in METALLURGICAL TRANSACTIONS A
  • 1976-06. Evaluation of toughness in AISI 4340 alloy steel austenitized at low and high temperatures in METALLURGICAL TRANSACTIONS A
  • 1999-02. Composition, microstructure, hardness, and wear properties of high-speed steel rolls in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1978-03. Further considerations on the inconsistency in toughness evaluation of AISI 4340 steel austenitized at increasing temperatures in METALLURGICAL TRANSACTIONS A
  • 1995-01. Effect of applied pressure on mechanical properties of squeeze cast mg matrix composites in METALS AND MATERIALS INTERNATIONAL
  • 1988-03. A thermodynamic evaluation of the Fe-Cr-C system in METALLURGICAL TRANSACTIONS A
  • 1985-09. The Fe-rich corner of the metastable C-Cr-Fe liquidus surface in METALLURGICAL TRANSACTIONS A
  • 1996-12. Correlation of microstructure and fracture toughness in high-chromium white iron hardfacing alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    DOI

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