Chromium Grain-boundary Segregation and Effect of Ion Beam Cleaning on Fe-Ni-Cr Alloys

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · Praktische Metallographie (Practical Metallography), 48(4):184-187

DOI:https://doi.org/10.3139/147.110121· OSTI ID:1012869

Saraf, Laxmikant V

The grain boundaries play important role to control the mechanical strength of ternary alloys. From spacecrafts to naval vessels to nuclear reactors, stress corrosion cracking, brittleness, oxidation mostly originates at the grain boundaries and cause long term structural stability problems in most of the metallic structures [1]. Fe-Ni-Cr based ternary metal alloys have been widely studied for more than fifty years [2, 3]. Despite of vast amount of research, chromium diffusion in stainless steel or other Ni-Fe-Cr based ternary alloys is still an open scientific problem with challenges in structural stability and corrosion resistance [4]. Particularly, austenite Fe-Ni-Cr is looked upon favorably in space and jet engine industry for their improved resistance to stress corrosion cracking [5]. In solid oxide fuel cells (SOFC), Ni-alloys are frequently used as interconnects and seals [6]. In this communication, simultaneous energy dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD) mapping is utilized to study chemical and structural aspects of chromium segregation in Fe-Ni-Cr alloy. A focused Ga-ion beam is also utilized to study the effect of ion beam cleaning on EBSD image quality (IQ) and inverse pole figure (IPF) maps of Fe-Ni-Cr alloy.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1012869
• Report Number(s): PNNL-SA-75376; KP1704020
• Journal Information: Praktische Metallographie (Practical Metallography), 48(4):184-187, Journal Name: Praktische Metallographie (Practical Metallography), 48(4):184-187 Journal Issue: 4 Vol. 48
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
ALLOYS
AUSTENITE
Alloys
BRITTLENESS
Beam
CHROMIUM
CLEANING
CORROSION RESISTANCE
Chromium
Cleaning
DIFFRACTION
DIFFUSION
ELECTRONS
ENGINES
Effect
Fe-Ni-Cr
GRAIN BOUNDARIES
Grain
ION BEAMS
Ion
OXIDATION
REACTORS
SEGREGATION
SOLID OXIDE FUEL CELLS
SPECTROSCOPY
STABILITY
STAINLESS STEELS
STRESS CORROSION
Segregation
boundary