Recrystallization in HR3C Austenitic Heat Resistant Steel

Abstract

In the present study, the recrystallization and grain growth behavior of HR3C austenitic heat resistant steel were studied by scanning electron microscopy and electron backscatter diffraction (SEM/EBSD). The HR3C steel was forged into a plate of 12mm in thickness and then solution treated at 1150-1250°C followed by an annealing treatment at 650-1050°C for 1h. The results show that the recrystalization occurs during the annealing treatment when the steel is solution-treated at 1150°C. Increasing the solution temperature to 1200°C or above, the recrystalization will not occur during the same annealing treatment. EBSD measured results show that the solution temperature has a significant effect on grain boundary character, especially on density of the low angle grain boundaries within the austenitic grain. The mechanism of the recrystallization and effect of annealing treatment on precipitation behavior of second phase were analyzed.

Metadynamic recrystallization behavior and workability characteristics of HR3C austenitic heat-resistant stainless steel with processing map

“…Iseda et al (2007) concluded that the sufficient toughness and microstructural stability can be maintained after the long term aging of HR3C steel at 500-750 • C. Peng et al (2010) found out that the M 23 C 6 precipitating on grain boundaries can result in the reduction of the impact toughness after aging for various time at 700 • C. The reasonable hot working process can be controlled to obtain high product rate and desired microstructures. Yin et al (2012) revealed a distinctive phenomenon that the recrystallization would occur during the annealing treatment after HR3C steel was solution-treated at 1150 • C. The dislocation of high density remained in the matrix of the steel is responsible for the driving force of recrystallization. Yanushkevich et al (2015) described grain refinement of an S304H-type steel during multiple rolling at temperatures of 500 • C to 1000 • C and found that rolling up to the strain of 2 can obtain the ultrafine-grained microstructure.…”