Characterization of true stress-true strain curves obtained by hot deformation of different types of steels

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90382-3· OSTI ID:6099248

Martin, G E.S.; Ruzzante, J E ^[1]

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1. FRBA CIT UTN, Buenos Aires (Argentina). Grupo Deformacion en Caliente CNEA, Buenos Aires (Argentina). Dept. Materials

The results of hot torsion tests in order to characterize the true stress-true strain curves at a high temperature for six different types of steel (carbon, free-cutting and alloyed), were presented in a previous work, and from those results, an expression was proposed to calculate the peak strain [bar [epsilon]][sub p]. Through it, the critical strain [bar [epsilon]][sub c] for the onset of the dynamic recrystallization is a function of Zener-Hollomon's parameter, Z, the initial austenitic grain size d[sub o], and the apparent activation energy of the hot deformation process Q: [bar [epsilon]][equals]75.34 d[sub 0][sup 1/2]Z[sup 0.15]Q[sup [minus]2.63]. In this work the authors obtain expressions to calculate the peak stress value [bar [sigma]][sub p], and the stationary state stress [bar [sigma]][sub ss] for the steels tested at the temperature and the strain rates studied. The authors also examined the similarity between the exponents of Z in the expression to calculate [bar [epsilon]][sub p] and [bar [sigma]][sub p], and the mean sensitivity of the torque, with respect to the strain rate calculated for all the steels at the temperature range studied.

• OSTI ID: 6099248
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:7; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITIC STEELS
CARBON STEELS
DEFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
STEELS
STRAIN RATE
STRAINS
STRESSES
TENSILE PROPERTIES
TORSION