Dynamic recrystallization behavior and microstructural evolution in SPHC steel

Abstract

The dynamic recrystallization (DRX) behaviors in SPHC steel were investigated with hot compression tests at deformation temperatures of 950-1 150 ℃, strain rates of 0.1-15 s −1 , and initial austenite grain sizes of 86-232 µm. The effects of deformation temperature, strain, strain rate and the initial austenite grain size on the microstructural evolution during DRX were studied in detail. The results show that DRX is observed under the condition of the Zener-Hollomon parameter being less than 1.07×10 13 s −1 . The deformation activation energy for SPHC steel is calculated to be 299.4 kJ/mol by regression analysis. Austenite grain size of DRX is refined with decreasing temperature and increasing strain rate under steady state conditions, but it is not influenced by the initial grain size. The mathematical equation of DRX grain size of SPHC steel is obtained.

Microstructure evolution in pure titanium during warm deformation by combined rolling processes

“…The value of exponent p in Eq. (13) is an order lower than the same value, which was calculated in works [42,43]. The low p is indicative of a weak dependence of critical strain of recrystallization on the parameter Z.…”

“…The critical strain e c is specified as a function of the peak strain e p for DRX [43]. For example of low carbon steels, the constant parameter a is 0.8 [44].…”

Analysis of LEACH Protocol Based on Ant Algorithm

“…Figure 1 is the network topology structure of LEACH agreement. Compared with flat routing protocols, LEACH protocols can reduce energy consumption, balance the energy to the whole network, and prolong the network's lifetime by 30% [3]. However, the direct communication mode between cluster and Sink node can caused fast energy consumption, short the network lifetime, and influenced the whole network.…”

Characterization of hot deformation behaviour of Nb-Ti microalloyed high-strength steel

“…In hot forming processes, the complex microstructural evolutions are often induced by multiplicative hot deformation mechanisms, such as work hardening (WH), dynamic recovery (DRV), and dynamic recrystallization (DRX) (Zhang et al, 2014;Liang et al, 2015). Dynamic softening behaviour during hot processing has generated considerable interest because component properties are influenced significantly by its corresponding microstructural evolution (Wu et al, 2010). During deformation in the DRX process, deformed grains are replaced with substructures and newly formed fine and uniformly distributed grains.…”