Use of analytical electron microscopy in evaluating ferrite stability in austenitic stainless steel welds

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5636384

Vitek, J M; David, S A

Stainless steel weld filler metals are prone to hot-cracking during welding. If the primary mode of solidification is ferrite formation rather than austenite formation, the tendency for hot-cracking is reduced. Type 308 stainless steel is such a filler metal which solidifies as primary ferrite and is relatively immune to hot-cracking problems. During further cooling, the primary ferrite transforms to austenite. When such duplex austenite plus ferrite weld microstructures are subjected to elevated temperature applications, the residual ferrite is unstable and transforms. Analytical electron microscopy has been used to study the ferrite stability. Results have provided insight into the stability of ferrite during welding and also during service at elevated temperatures. This paper considers three cases in which the use of analytical electron microscopy has led to understanding of ferrite stability in duplex type 308 stainless steel welds.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5636384
• Report Number(s): CONF-860829-6; ON: DE86008537
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELECTRON MICROSCOPY
FERRITE
FILLER METALS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MICROSCOPY
NICKEL ALLOYS
PHASE TRANSFORMATIONS
STABILITY
STAINLESS STEEL-308
STAINLESS STEELS
STEELS
WELDED JOINTS