Effect of internal boundaries on the yield strengths of spheroidized steels

Journal Article · Sun Feb 01 04:00:00 EST 1976 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02644456· OSTI ID:7351444

Anand, L ^[1]; Gurland, J

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1. US Steel Corp., Monroeville, PA

The combined effects of cementite particles, grain boundaries, and subgrain boundaries on the room temperature yielding behavior of spheroidized, plain carbon steels were investigated. Spheroidization by austenitizing and quenching, followed by annealing at temperatures just under the A/sub 1/ temperature, produced a subgrain-connected cementite particle distribution. The subgrain size, lambda/sub l,p/, stabilized by the particles governs the yield stress. In contrast, austenitizing and quenching, followed by thermal cycling about the A/sub 1/ temperature, produced microstructures with a large fraction of intraboundary, subgrain-free cementite particles. The lower yield stress of these steels could not be accounted for by either the Orowan or the Ansell-Lenel theory. The yield stress is predominantly controlled by the ferrite grain size, lambda/sub g/, via the relation sigma/sub ..gamma../ = 12.4 + 1.87 lambda/sub g//sup -/sup 1///sub 2//, kgf/mm/sup 2/. The intraboundary particles contribute only a small strain-hardening term which increases the value of the friction stress (12.4 kgf/mm/sup 2/) over that associated with grain boundary strengthening alone (8.8 +- 0.8 kgf/mm/sup 2/).

• OSTI ID: 7351444
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 7:2; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITE
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CARBON STEELS
CEMENTITE
CRYSTAL STRUCTURE
FERRITE
GRAIN BOUNDARIES
GRAIN SIZE
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MICROSTRUCTURE
QUENCHING
SIZE
STEELS
STRESSES
TRANSITION ELEMENT COMPOUNDS
YIELD STRENGTH