The effect of high-energy electron-beam irradiation on microstructural modification of a high-speed steel roll

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02663865· OSTI ID:417872

Suh, D; Lee, S; Koo, Y ^[1]; Lee, H C ^[2]

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1. Pohang Univ. of Science and Technology (Korea, Republic of)
2. Kangwon Industries, Ltd., Pohang (Korea, Republic of). Roll Technology Dept.

The purpose of this study is to investigate the microstructural modification in a high-speed steel (HSS) roll irradiated with an accelerated high-energy electron beam. The HSS roll samples were irradiated at the beam travel speeds of 2.5 to 25 mm/s using an electron accelerator (1.4 MeV). The microstructure was examined with a scanning electron microscope (SEM) capable of in situ fracture testing and simultaneous measurement of the apparent fracture toughness. Irradiation changed the matrix phase from tempered martensite to a mixture of retained austenite and martensite. Coarse primary carbides were partially or completely dissolved, depending on the heat input. Irradiation greatly improved the fracture properties because of the presence of retained austenite, which could retard crack propagation, although hardness was decreased. Occasional interior quench cracks were found in the heat-affected region. Appropriate processing methods, such as pre- or postirradiation, were suggested. A heat transfer analysis of the irradiated surface layer was also carried out to elucidate the influence of the irradiation parameters on the microstructure.

• Sponsoring Organization: USDOE
• OSTI ID: 417872
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CASTING
CHEMICAL COMPOSITION
CRACKS
ELECTRON BEAMS
FRACTURE PROPERTIES
HARDNESS
HEAT TRANSFER
LAYERS
MANGANESE ADDITIONS
MARTENSITE
MICROSTRUCTURE
PHOSPHORUS ADDITIONS
PHYSICAL RADIATION EFFECTS
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
STEELS
SULFUR ADDITIONS