Migration of carbon in tempered martensitic steel during excimer laser melting
The migration of ion implanted {sup 13}C in tempered martensitic steel (nominal composition 1.05 wt. % C, 0.2 wt. % Si, and 0.3 wt. % Mn) during excimer laser melting was examined utilizing the resonance of the {sup 13}C(p,{gamma}){sup 14}N reaction at Ep = 1747.6 keV. Depth concentration profiles after five and ten laser pulses of 1 J/cm{sup 2} revealed deviation from random walk diffusion in a homogeneous media. This was modelled by using the solubility controlled flow of carbon in iron-carbon melt. A diffusion length of 2{radical}D{tau} 34 {plus minus} 2 nm during a period {tau} of the melted phase was deduced. Significant amorphous to crystalline transformation occurred during the rapid self quenching following laser melting. 18 refs., 3 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOD; DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5249718
- Report Number(s):
- LA-UR-89-4083; CONF-891119-54; ON: DE90004838; CNN: DEW-88-24
- Resource Relation:
- Journal Volume: 157; Conference: Materials Research Society fall meeting, Boston, MA (USA), 27 Nov - 2 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON
DIFFUSION
STEELS
MELTING
CARBON 13
EXCIMER LASERS
MARTENSITE
MICROSTRUCTURE
SOLUBILITY
ALLOYS
CARBON ADDITIONS
CARBON ISOTOPES
CRYSTAL STRUCTURE
ELEMENTS
EVEN-ODD NUCLEI
GAS LASERS
IRON ALLOYS
IRON BASE ALLOYS
ISOTOPES
LASERS
LIGHT NUCLEI
NONMETALS
NUCLEI
PHASE TRANSFORMATIONS
STABLE ISOTOPES
360104* - Metals & Alloys- Physical Properties
360101 - Metals & Alloys- Preparation & Fabrication