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Dynamic recrystallization behavior of centimeter scale grains during the forging process of superheavy ingots

WEN-LONG ZHAO1, QING-XIAN MA1,*

Affiliation

  1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Abstract

Typically, the microstructure of superheavy ingots consists of centimeter-scale grains. In this study, the dynamic recrystallization (DRX) behavior of such grains during forging was investigated. It was found that the centimeter-scale grains are refined by DRX mechanisms to various degrees, depending on the temperature. When forging is performed at 900°C, the nucleation mechanisms of DRX at 900°C are assisted by discontinuous dynamic recrystallization (DDRX) as well as the formation and development of subgrains, whose developing sub-boundaries divide the individual original grains into several fine grains. However, as the temperature increased to 1000°C, the final grain size increases significantly. The nucleation of DRX is manifested mainly as DDRX, but is also accompanied by twinning within the interiors of the original grains, contributing to the formation of new grains by means of transformation into grains with high-angle boundaries or nucleation through superposition..

Keywords

Heavy forgings, Coarse grains DRX.

Citation

WEN-LONG ZHAO, QING-XIAN MA, Dynamic recrystallization behavior of centimeter scale grains during the forging process of superheavy ingots, Optoelectronics and Advanced Materials - Rapid Communications, 9, 3-4, March-April 2015, pp.547-551 (2015).

Submitted at: March 3, 2015

Accepted at: March 19, 2015