Non-equilibrium grain boundary segregation of boron in austenitic stainless steel - II. Fine scale segregation behaviour

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(88)90024-7· OSTI ID:7006377

Karlsson, L; Norden, H

A combination of TEM, FIM, AP and IAP has been used to study boron grain boundary segregation in austenitic stainless steels of the types 316L (with 40 ppm or with <1ppm boron) and ''Mo-free 316L'' (23 ppm boron). High resolution segregation profiles were determined for cooling rates from 0.29 to 530/sup 0/C/s for three starting temperatures: 800, 1075 and 1250/sup 0/C. Boron grain boundary segregation was found after all heat treatments. The segregation behaviour was mainly of the non-equilibrium type after cooling from 1075 to 1250/sup 0/C whereas equilibrium segregation dominated after rapid cooling from 800/sup 0/C. The influence of the relative grain orientation on the amount of non-equilibrium segregation was small for general boundaries. However, no segregation was detected at coherent twin boundaries. The binding energy of boron to austenite grain boundaries was estimated at 0.65 +- 0.4eV for both types of steels. The influence of the composition and boron content of the steels on the segregation behaviour is discussed and the experimental techniques used are presented.

• Research Organization: ESAB AB, Box 8004, S-402 77 Goteborg (SE)
• OSTI ID: 7006377
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 36:1; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOYS
AUSTENITIC STEELS
BINDING ENERGY
BORON
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COOLING
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PRECIPITATION
SEMIMETALS
SEPARATION PROCESSES
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
VERY HIGH TEMPERATURE