Microstructural origin of the skeletal ferrite morphology of austenitic stainless steel welds

Technical Report · Thu Apr 01 04:00:00 EST 1982

DOI:https://doi.org/10.2172/5199878· OSTI ID:5199878

Brooks, J A; Williams, J C; Thompson, A W

Scanning transmission electron microscopy was conducted on welds exhibiting a variety of skeletal, or vermicular ferrite morphologies in addition to one lathy ferrite morphology. These ferrite morphologies result from primary ferrite solidification followed by a solid state transformation upon cooling. During cooling, a large fraction of the ferrite transforms to austenite leaving a variety of ferrite morphologies. Comparison of composition profiles and alloy partitioning showed both the skeletal and lathy ferrite structures result from a diffusion controlled solid state transformation. However, the overall measured composition profiles of the weld structure are a result of partitioning during both solidification and the subsequent solid state transformation.

• Research Organization: Sandia National Labs., Livermore, CA (USA); Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Metallurgy and Materials Science
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5199878
• Report Number(s): SAND-82-8667; ON: DE82014185
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBON ADDITIONS
CHROMIUM
CHROMIUM ALLOYS
COOLING
CORROSION RESISTANT ALLOYS
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTS
FERRITE
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
METALS
MICROSCOPY
MORPHOLOGY
NICKEL
PHASE TRANSFORMATIONS
STAINLESS STEELS
STEELS
TRANSITION ELEMENTS
WELDED JOINTS