Effect of Ausforming Strain on the Microstructural Evolution of Lath Martensite in Low Carbon Steel

He, B. B.1,2; Guan, Q. W.2

2022-04-01

10.1007/s12540-021-01151-y

METALS AND MATERIALS INTERNATIONAL   影响因子和分区

1598-9623

2005-4149

Dislocation engineering is a novel alloy design strategy to produce advanced high strength steels with both high strength and good ductility, which can be accomplished through an ausforming process. The present work studies the effect of ausforming strain on the evolution of lath martensite microstructure in low carbon steel by detailed transmission electron microscopy observation. Ausforming strain determines the length of the martensite blocks and the substructure in the lath martensite. The large ausforming strain (20%-45%) reduces the martensite blocks and leads to the development of dislocation cell structure, both of which are absent in the ausformed martensite with a small ausforming strain (5%-10%). The formation of the dislocation cell structure in the prior austenite grains after the large plastic deformation inhibits the propagation of martensite and thus reduces the length of martensite blocks. Irrespective of the ausforming strain, the plastic deformation of austenite grains does not lead to an obvious change of martensite lath width. The large ausforming strain slightly enhances the auto-tempering of martensite on the aspect of precipitates density. The coarse precipitates formed close to the lath boundaries after small ausforming strain of 5% is absent in the martensite with large ausforming strain (20%-45%), which is ascribed to the presence of intensive dislocations generated by elevated ausforming strain can facilitate the pipe diffusion of carbon. The present finding serves as the microstructural basis for the application of the dislocation engineering concept in the design of advanced high-strength steel with the martensite as the intrinsic component.

Martensite Ausforming Dislocation cell Auto-tempering

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[U52071173] ; Science and Technology Innovation Commission of Shenzhen["JCYJ20210324120209026","ZDSYS20200810171201007","KQTD2019092917250571"]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000784629400001

KOREAN INST METALS MATERIALS

20221712029103

Austenite ; High resolution transmission electron microscopy ; High strength alloys ; High strength steel ; Low carbon steel ; Microstructural evolution ; Plastic deformation ; Tempering

Metallurgy:531.1 ; Metallography:531.2 ; Heat Treatment Processes:537.1 ; Steel:545.3 ; Optical Devices and Systems:741.3

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Key Lab Cross Scale Mfg Mech, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

He, B. B.,Guan, Q. W.. Effect of Ausforming Strain on the Microstructural Evolution of Lath Martensite in Low Carbon Steel[J]. METALS AND MATERIALS INTERNATIONAL,2022.

He, B. B.,&Guan, Q. W..(2022).Effect of Ausforming Strain on the Microstructural Evolution of Lath Martensite in Low Carbon Steel.METALS AND MATERIALS INTERNATIONAL.

He, B. B.,et al."Effect of Ausforming Strain on the Microstructural Evolution of Lath Martensite in Low Carbon Steel".METALS AND MATERIALS INTERNATIONAL (2022).