Accession Number:

AD0002617

Title:

STRAIN AGING AND RHEOTROPIC RECOVERY

Descriptive Note:

Techncial rept.

Corporate Author:

CASE INST OF TECH CLEVELAND OH METALS RESEARCH LAB

Personal Author(s):

• RIPLING, E. J.

Report Date:

1953-02-01

Pagination or Media Count:

25.0

Abstract:

Specimens of SAE 1340, 34-in. -diam hot-rolled rods were prepared. Both prestrain and final ductility measurements were made by determining the specimen diameter on a microcomparator before and after each straining operation. Data are given for the specimens quenched and tempered at 600 deg F, followed by prestretching at room temperature, aging, and final testing at a sub-transition temperature -210 deg F. The rheotropic recovery produced in a high strength steel was not eliminated by reheating the steel at least up to the initial tempering temperature. The ductility of the rheotropically recovered metal was far more sensitive to strain aging than the same metal at a super- transition temperature when it was not rheotropically embrittled. Strain aging appeared to have only a mild effect on the tensile ductility transition temperature of the heat-treated SAE 1340 used in the investigation.

Descriptors:

• *HIGH STRENGTH ALLOYS
• TEST AND EVALUATION
• THERMAL PROPERTIES
• MEASUREMENT
• TENSILE PROPERTIES
• STEEL
• ROOM TEMPERATURE
• TRANSITION TEMPERATURE
• RHEOLOGY
• DUCTILITY
• TEMPERING

Subject Categories:

• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE