Microstructural simulations of dynamic recrystallization

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7259108

Rollett, A. D. ^[1]; Srolovitz, D. J. ^[2]; Luton, M. J. ^[3]

---

1. Los Alamos National Lab., NM (USA)
2. Michigan Univ., Ann Arbor, MI (USA). Dept. of Materials Science and Engineering
3. Exxon Research and Engineering Co., Annandale, NJ (USA). Corporate Research Labs.

A Monte Carlo model for the simulation of static recrystallization and grain growth has been adapted for dynamic recrystallization by adding recrystallization nuclei and stored energy continuously with time. The results of the simulations have shown that many of the essential features of dynamic recrystallization are reproduced. The stored energy of the system, which may be interpreted as the flow stress, goes through a maximum and then decays, monotonically under some conditions and otherwise in an oscillatory manner. The principal parameters that were varied were the rate of adding stored energy, {Delta}H, and the rate of adding nuclei, {Delta}N. As {Delta}H increases, for fixed {Delta}N, the oscillations decay more rapidly and the asymptotic stored energy rises. As {Delta}N increases, again the oscillations decay more rapidly but the asymptotic stored energy decreases. The mean grain size of the system also oscillates in a similar manner to the stored energy but 90{degree} out of phase. Necklacing of the prior grain structure by new grains is observed for low {Delta}H and high {Delta}N; it is however, not an invariable feature of grain refinement, i.e,. cases where the dynamic grain size is smaller than the initial grain size. All these results were obtained without the addition of special parameters to the model such as a critical strain for the initiation of recrystallization. 9 refs., 6 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7259108
• Report Number(s): LA-UR-90-660; CONF-8910304--3; ON: DE90007504
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ENERGY
GRAIN SIZE
LINE DEFECTS
MICROSTRUCTURE
MONTE CARLO METHOD
NUCLEATION
PHYSICAL PROPERTIES
RECRYSTALLIZATION
SIMULATION
SIZE
STORED ENERGY
THERMODYNAMIC PROPERTIES