Effect of alloying elements on metadynamic recrystallization in HSLA steels

Journal Article · Sun Jan 01 00:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02669803· OSTI ID:6609887

Roucoules, C ^[1]; Yue, S; Jonas, J J ^[2]

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1. BHP Research Labs., Mulgrave (Australia)
2. McGill Univ, Montreal, Quebec (Canada). Dept. of Metallurgical Engineering

By means of interrupted torsion tests, the kinetics of metadynamic recrystallization (MDRX) were studied in a Mo, a Nb, and a Ti microalloyed steel at temperatures ranging from 850 C to 1,000 C and strain rates from 0.02 to 2 s[sup [minus]1]. Quenches were also performed after full MDRX. In contrast to the case of static recrystallization (SRX), the kinetics of MDRX are shown to be highly sensitive to a change of an order of magnitude in strain rate and are relatively insensitive to temperature changes within the range of values applicable to industrial hot-rolling practice. A similar algebraic dependence of the MDRX grain size on strain rate and temperature was found in the three steels. The kinetics of MDRX were slower in the Nb than in the mo steel, and those of the Ti steel were slower than in the Nb and Mo steels. Above 900 C and 950 C, the retardation of MDRX in the Nb and Ti steels, respectively, is due to solute drag. Models predicting the start time for Nb and Ti carbonitride precipitation showed that MDRX is delayed below these temperatures by this mechanism. Comparison of the MDRX and precipitation start times in the Nb steel indicated that a temperature of no-MDRX'' could not de defined, in contrast to the well-defined T[sub nr] (no recrystallization temperature) of SRX. By means of torsion simulations composed of multiple interruptions, it is shown that MDRX is retarded decreasingly as the accumulated strain is increased. This appears to be due to the promotion of precipitate coarsening by the continuing deformation.

• OSTI ID: 6609887
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 26:1; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LOW ALLOY STEELS
RECRYSTALLIZATION
MOLYBDENUM
METALLURGICAL EFFECTS
NIOBIUM
TITANIUM
EXPERIMENTAL DATA
TEMPERATURE RANGE 1000-4000 K
ALLOYS
DATA
ELEMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
METALS
NUMERICAL DATA
STEELS
TEMPERATURE RANGE
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies