The strengthening mechanisms in modified AISI 316 stainless steels

Technical Report · Wed Apr 01 04:00:00 EST 1987

OSTI ID:6481916

Carolan, R A; Li, Che-Yu; Maziasz, P J; Swindeman, R W; Todd, J A

The flow strength of a series of modified type AISI 316 austenitic stainless steels with stabilizing additions and with combined copper and stabilizing additions were evaluated after various thermo-mechanical treatments at elevated temperatures by using the load relaxation technique. The test results showed that there is a synergistic increase in strength when both copper and stabilizing additions are made and combined with prior cold work before stabilization treatment. Microstructural examination showed that copper increases the nucleation rate of MC type precipitation on grain matrix dislocations produced by cold work creating a fine distribution of these precipitates. This precipitation process enhances the strength of the steels and improves microstructural stability at elevated temperatures. 13 refs., 18 figs., 2 tabs.

• Research Organization: Cornell Univ., Ithaca, NY (USA). Dept. of Materials Science and Engineering; Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6481916
• Report Number(s): ORNL/Sub-85-27488/01; ON: DE87011983
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ADDITIVES
ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COLD WORKING
COPPER
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
MICROSCOPY
MICROSTRUCTURE
MODIFICATIONS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM
STABILIZATION
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TESTING
TITANIUM
TRANSITION ELEMENTS
VANADIUM