Microstructure Refinement and Property Improvement of Metastable Austenitic Manganese Steel Induced by Electropulsing

Grain refinement efficiency of electropulsing treatment （EPT） for metastable austenitic manganese steel was investigated. The mean grain size of original austenite is 300 ptm. However, after EPT, the microstructure ex hibits a bimodal grain size distribution, and nearly 70vol. % grains are less than...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2014-07, Vol.21 (7), p.685-689
Main Authors: ZHAO, Yu-guang, ZHANG, Jia-tao, TAN, Juan, MA, Bing-dong
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Austenite
Austenitic stainless steels
electropulsing
Engineering
Grain refinement
Grains
Iron and steel industry
Machines
Manganese steels
Manufacturing
Martensitic stainless steels
Materials Engineering
Materials Science
Metallic Materials
metastable austenitic manganese steel
Microstructure
Physical Chemistry
Processes
Steels
奥氏体锰钢
平均晶粒尺寸
性能改善
电脉冲
组织细化
脉冲电流处理
颗粒尺寸分布
马氏体组织
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Summary:Grain refinement efficiency of electropulsing treatment （EPT） for metastable austenitic manganese steel was investigated. The mean grain size of original austenite is 300 ptm. However, after EPT, the microstructure ex hibits a bimodal grain size distribution, and nearly 70vol. % grains are less than 60 /Lm. The refined austenite results in ultrafine martensitic microstrncture. The tensile strengths of refined austenitic and martensitic microstructures were improved from 495 to 670, and 794 to 900 MPa respectively. The fine grained materials possess better fracture toughness. The work hardening capacity and wear resistance of the refined austenitic microstructure are improved. The reasonable mechanism of grain refinement is the combination of accelerating new phase nucleation and restraining the growth of neonatal austenitic grain during reverse transformation and rapid recrystallization induced by electropulsing.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(14)60106-0