The influence of solidification rate on solute redistribution and second-phase formation in stainless steel alloys

Conference · Wed May 30 04:00:00 EDT 1990

OSTI ID:6670390

Elmer, J W ^[1]; Eagar, T W; Allen, S M ^[2]

---

1. Lawrence Livermore National Lab., CA (USA)
2. Massachusetts Inst. of Tech., Cambridge, MA (USA)

Many common SS alloy microstructures consist of a mixture of ferrite and austenite phases, however, when these alloys are rapidly resolidified using laser beam (LB) or electron beam (EB) processes, they solidify in the single-phase-austenite or single-phase-ferrite mode. This paper investigates the influence of solidification rate on the reduction, and eventual elimination, of second phases during the rapid solidification of Fe-Ni-Cr alloys. The influence of solidification rate on the ferrite content of these alloys was studied by calculating the dendrite-tip undercooling and then incorporating these results into a solute-redistribution model. The calculations and experiments agree semi-quantitatively, allowing the relative fractions of primary and secondary phases that solidify from the melt to be calculated for a wide range of solidification rates. 7 refs., 1 fig.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6670390
• Report Number(s): UCRL-JC-104189; CONF-9010159--1; ON: DE90015189
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BEAMS
CRYSTAL STRUCTURE
ELECTRON BEAMS
FABRICATION
FERRIMAGNETIC MATERIALS
FERRITES
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
JOINING
LASER WELDING
LEPTON BEAMS
MAGNETIC MATERIALS
MATERIALS
MICROSTRUCTURE
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHASE STUDIES
PHASE TRANSFORMATIONS
SOLIDIFICATION
STAINLESS STEELS
STEELS
TRANSITION ELEMENT COMPOUNDS
WELDING