Influence of banded ε-martensite and deformation twin on cryogenic toughness of Fe–Mn–xAl–C steel
Year: 2023
Type: article
Abstract: Fe-Mn-xAl-C high manganese steel ingots have been fabricated by vacuum melting with Al compositions varied from x = 0 to 3 and 5 wt.%, respectively. After properly hot-forging and hot-rolling as well as solution heat treatments, impact toughness tests were carried out at 77 K using a standard full-size of Charpy impact V-notch configuration. It was found that the addition of Al element is more conducive to enhance the cryogenic toughness. The relationship between the cryogenic toughness and the Al composition has been revealed through detailed microstructural studies by transmission-electron microscopy. The plastic deformation is dominated by deformation bands which are dominated by deformation twins (DTs) and ε-martensite at x = 0 and DTs at x = 3 and 5%, respectively. The ε-martensite is less resistant than DTs to the shear bands. The DTs with high density, together with their contented dislocations, significantly contributed to the high cryogenic toughness of the studied HMS steel with higher Al content.
Authors: Leilei Li, Gang Niu, Na Gong, Hongfei Liu, Xuelin Wang, Chengjia Shang, Yong Wang, Huibin Wu
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,300
Awards: G3584656245, G5135263660
OpenAlex ID: W4387095545