Elevated temperature exposure has significant effects on the structure of austenitic stainless steel welds

Conference · Mon Jan 01 04:00:00 UTC 1979

OSTI ID:6066341

Edmonds, D P; Gray, R J

In order to minimize hot-cracking in austenitic stainless steel weld metals, the chemical compositions are generally adjusted to produce small amounts of delta-ferrite in the microstructure. Levels of ferrite in the range of 2 to 15 FN are acceptable for welds in these materials. An investigation of effects of aging and testing at 593/sup 0/C on the structures of type 308 stainless steel weld metals were investigated. Shielded metal-arc (SMA) welds were made with electrodes formulated by a commercial manufacturer to produce four different concentration levels of delta-ferrite. By varying the chromium-to-nickel concentration ratios (within the type 308 limits) in the deposits, weld metals with nominally 2, 5, 10, and 15 FN were produced. Specimens from these materials were aged and creep tested in air at 593/sup 0/C for times up to 36 Ms. Aged specimens were Charpy impact tested at room temperature. Both creep and impact-tested specimens were then examined metallographically.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6066341
• Report Number(s): CONF-790736-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AGING
ALLOYS
AUSTENITIC STEELS
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACKS
CREEP
CRYSTAL STRUCTURE
ELEMENTS
FERRIMAGNETIC MATERIALS
FERRITES
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
JOINTS
MAGNETIC MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NICKEL
NICKEL ALLOYS
OXYGEN COMPOUNDS
STAINLESS STEEL-308
STAINLESS STEELS
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WELDED JOINTS