Tempering rapidly solidified ductile cast iron by pulsed laser beam reprocessing
- Beijing Univ. of Aeronautics and Astronautics (China). Dept. of Materials Science and Engineering
- Univ. of Erlangen-Nuernberg, Erlangen (Germany). Materials Science Dept.
During laser surface rapid remelting of cast irons, the melt pool solidifies rapidly and metastably (i.e. according to the metastable Fe-Fe[sub 3]C system) producing an ultra-fine ledeburite hard surface which is much more abrasion resistant than the original substrate. Previous literature mainly focused on remelting various grey and ductile irons with high power CO[sub 2] lasers for improved wear resistance and other surface properties, and on studying the physical metallurgy of laser remelted surfaces. Unfortunately, the unstable nature and rapid tempering behavior of the rapidly solidified ledeburite were generally neglected, although some publications mentioned the tempering phenomenon during successive overlap remelting. In this paper, a laser remelted ductile case iron surface was tempered by rapid pulsed laser beam reprocessing. The rapidly solidified ductile iron was found to be rapidly graphitized, as a result, a layer of Fe-base alloy containing ultra-fine graphite particles was produced. The unusual rapid graphitization phenomenon was preliminarily discussed.
- OSTI ID:
- 7105329
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:4; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CAST IRON
DATA
EXPERIMENTAL DATA
HEAT TREATMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MELTING
MICROSTRUCTURE
NUMERICAL DATA
PHASE TRANSFORMATIONS
SOLIDIFICATION
TEMPERING
TRANSITION ELEMENT COMPOUNDS