A scanning electron microscopy study of carbides in high-speed steels

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Materials Performance; (United States)

DOI:https://doi.org/10.1016/1044-5803(92)90091-U· OSTI ID:7048545

Peidao, D; Gongqi, S; Shouze, Z ^[1]

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1. Dept. of Metallurgy and Materials Engineering Chongqing Univ., Chongqing 630044 (CN)

This paper discusses investigations made using scanning electron microscopy to examine deeply etched specimens and electrolytically extracted carbides of as-cast high-speed steels. It is shown that eutectic carbides appear in three types of eutectic morphologies. A carbide wall exists around type I skeleton eutectic, and growth steps are evident on the top of carbide platelets of the lamellar type II eutectic. Type III generally develops a thick plate or bar form. The delta-eutectoid carbide attains a bunched fiber shape. Increasing molybdenum and decreasing tungsten leads to a change of eutectic carbide from skeleton to platelike and fiberlike morphologies. Vanadium not only promotes the formation of MC carbide, but also the formation of M{sub 2}C carbide. it was noted to be unfavorable to the formation of M{sub 6}C carbide, and increasing the vanadium content results in an increase in the size of eutectic and eutectoid carbides.

• OSTI ID: 7048545
• Journal Information: Materials Performance; (United States), Vol. 29:1; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBIDES
SCANNING ELECTRON MICROSCOPY
CORROSION RESISTANT ALLOYS
CHEMICAL COMPOSITION
STEELS
CORROSION PROTECTION
ETCHING
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
PHASE STUDIES
POWDER METALLURGY
TUNGSTEN ALLOYS
VANADIUM ALLOYS
ALLOYS
CARBON COMPOUNDS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
IRON ALLOYS
IRON BASE ALLOYS
METALLURGY
MICROSCOPY
SURFACE FINISHING
360105* - Metals & Alloys- Corrosion & Erosion
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies