An atom-probe study of retained austenite in ferritic weld metal

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Welding Journal (Miami); (United States)

OSTI ID:7040704

Chandrasekharaiah, M N ^[1]; Dubben, G ^[2]; Kolster, B H ^[3]

---

1. Welding Research Inst., BHEL, Tiruchirapalli (IN)
2. Ned. Philips Bedrijven B.V., Eindhoven (NL)
3. Dept. of Mechanical Engineering, Univ. of Twente, Enschede (NL)

This paper reports that the addition of titanium and boron to welding consumables results in an acicular ferrite microstructure that imparts excellent toughness to the weldment. An atom-probe field-ion microscopic study was carried out to study the influence of carbon and boron on the {gamma}-{alpha} transformation in a ferritic weld metal and on the formation of acicular ferrite. It was observed that carbon diffuses into the remaining austenite when acicular ferrite is formed. The retained austenite can be enriched up to 7 at.% with carbon, and it showed to be stable at a temperature of 90 K after removing some of the surrounding acicular ferrite grains. The atom-probe analysis did not indicate the presence of boron either at the {gamma}-{alpha} interface or in the retained austenite grain.

• OSTI ID: 7040704
• Journal Information: Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 71:7; ISSN WEJUA; ISSN 0043-2296
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALLOYS
ATOM TRANSPORT
AUSTENITE
BORON ADDITIONS
BORON ALLOYS
CARBON
CARBON ADDITIONS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
FABRICATION
FERRITIC STEELS
GRAIN BOUNDARIES
INTERFACES
ION MICROPROBE ANALYSIS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROANALYSIS
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
NONDESTRUCTIVE ANALYSIS
NONMETALS
PHASE TRANSFORMATIONS
RADIATION TRANSPORT
STEELS
TITANIUM ADDITIONS
TITANIUM ALLOYS
WELDING