Microstructure Evolution of Haynes230 Superalloy during Hot Deformation

作者：Liu Yi^*; Xu Kun; Luo Ximing; Chen Dengquan; Li Wei; Hu Rui; Li Jinshan

来源：Rare Metal Materials and Engineering, 2013, 42(9): 1820-1825.

• Haynes230 alloy
• hot deformation
• microstructure evolution
• dynamic recrystallization

Hot compression tests of Haynes230 superalloy were conducted using a Thermecmastor-Z simulator in the temperature range of 950 similar to 1250 degrees C and strain rates of 0.001 similar to 10 s(-1). Optical microscope (OM) and transmission electron microscope (TEM) techniques were employed to investigate the microstructure evolution and nucleation mechanisms of dynamic recrystallization (DRX). Results show that both the size and volume fraction of DRX grains increase with the increasing of deformation temperature but decrease with the increasing of strain rate. The dominant nucleation mechanism of DRX is bulging of the original grain boundaries. The necklace structure of recrystallized grains along original grain boundaries plays an important role for nucleation and growth of DRX grains. The relationship between DRX steady state grain size and Zener-Holloman parameter can be well established by a power law function. Key words: Haynes230 alloy; hot deformation; microstructure evolution; dynamic recrystallization

• 出版日期2013-9
• 单位西北工业大学