Solidification microstructures in single-crystal stainless steel melt pools

Technical Report · Tue Mar 01 04:00:00 EST 1994

DOI:https://doi.org/10.2172/10141631· OSTI ID:10141631

Sipf, J B; Boatner, L A; David, S A

Development of microstructure of stationary melt pools of oriented stainless steel single crystals (70%Fe-15%Ni-15%Cr was analyzed. Stationary melt pools were formed by electron-beam and gas-tungsten-arc heating on (001), (011), and (111) oriented planes of the austenitic, fcc-alloy crystals. Characterization and analysis of resulting microstructure was carried out for each crystallographic plane and welding method. Results showed that crystallography which favors ``easy growth`` along the <100> family of directions is a controlling factor in the microstructural formation along with the melt-pool shape. The microstructure was found to depend on the melting method, since each method forms a unique melt-pool shape. These results are used in making a three-dimensional reconstruction of the microstructure for each plane and melting method employed. This investigation also suggests avenues for future research into the microstructural properties of electron-beam welds as well as providing an experimental basis for mathematical models for the prediction of solidification microstructures.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10141631
• Report Number(s): ORNL/TM--12623; ON: DE94009839
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101
360102
ELECTRON BEAM WELDING
GAS TUNGSTEN-ARC WELDING
MELTING
MICROSTRUCTURE
MONOCRYSTALS
ORIENTATION
PREPARATION AND FABRICATION
SOLIDIFICATION
STAINLESS STEELS
STRUCTURE AND PHASE STUDIES
WELDING