Subgrain refinement strengthening. Third quarterly progress report, April 1, 1975-June 30, 1975

Technical Report · Wed Jan 01 04:00:00 EST 1975

DOI:https://doi.org/10.2172/5012905· OSTI ID:5012905

Klundt, R.; Monma, Y.; Sherby, O. D.

The possible influence of subgrain size on the creep strength of 304 stainless steel was assessed by constant crosshead speed tests at 900, 1000 and 1100/sup 0/C. The data obtained were compared with the results of other investigations. It appears that 304 stainless steel can be strengthened considerably by the presence of subgrains. Specifically, the flow stress, sigma, is shown to be a function of the subgrain size, lambda, following the relation sigma varies as lambda/sup -0/ /sup 35/. It is predicted that 304 stainless steel can be increased in strength by a factor of 2.7 over the normally expected strength at 650/sup 0/C and d epsilon/dt = 10/sup -10/ S/sup -1/ (i.e. one year rupture life) if stable subgrains 0.2 ..mu..m in size can be developed. Decrease in strain-rate tests reveal the possible instability of subgrains in 304 stainless steel at high temperatures. 12 figures.

• Research Organization: Stanford Univ., CA (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: AT03-76SF70038
• OSTI ID: 5012905
• Report Number(s): DOE/SF/70038-T4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
CRYSTAL STRUCTURE
FLOW STRESS
GRAIN REFINEMENT
GRAIN SIZE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
RESEARCH PROGRAMS
SIZE
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRAIN RATE
STRESSES