THE EFFECT OF COLD WORK AND TEMPERATURE ON THE STRENGTH AND STRUCTURE OF STEEL

Technical Report · Thu Jan 26 00:00:00 EST 1961

OSTI ID:4079823

Shahinian, P; Achter, M R

An investigation was made to determine the influence of cold work on the strength of a low-alloy steel at elevated temperature. The measurements, which include hardness, tensile, and creep-rupture properties, were used to explain the behavior of the material, including an apparent anomaly. In addition, optical and electron microscopy, and x-ray-diffraction techniques were employed to follow microstructural changes in the steel. The steel in the quenched and tempered condition was strengthened, in a normal manner, in creeprupture at high temperatures by large amounts of cold work, but was weakened in an anomalous manner by small amounts of deformation. The reduction in strength of the cold- worked steel, compared to an unworked sample, is attributed to an observed increase in mean-free ferrite path, induced apparently by the prior cold work. An explanation is offered for the weakening at small deformations and strengthening at large deformations in terms of two opposing effects of cold work in competition: a softening caused by a microstrain and strain aging. For small amounts of cold reduction the softening predominates, whereas for large amounts the hardening is the more effective. In contrast to the behavior of the quenched and tempered steel, the steel in the annealed condition was strengthened progressively by an increase in prior cold work. (auth)

• Research Organization: Naval Research Lab., Washington, D.C.
• NSA Number: NSA-15-021152
• OSTI ID: 4079823
• Report Number(s): NRL-5603
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-61
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ANNEALING
COLD WORKING
CONFIGURATION
CREEP
DEFORMATION
DIFFRACTION
ELECTRON MICROSCOPY
FAILURES
FERRITES
HARDNESS
HEAT TREATMENTS
HIGH TEMPERATURE
LATTICES
MEASURED VALUES
METALLOGRAPHY
MICROSCOPY
QUANTITATIVE ANALYSIS
QUENCHING
REACTION KINETICS
SAMPLING
STEELS
TEMPERATURE
TENSILE PROPERTIES
THICKNESS
VARIATIONS
X RADIATION