Development of a high-strength Fe-12Mn maraging steel via designing lath interfacial and intragranular nanostructures

Yang, Mujin1,2; Huang, Chao2; Yao, Zhifu2; Yang, Zhijie2,6; Li, Zhou3; Wang, Cuiping4,5; Wu, Haichen7; Yang, Tao8; Zhao, Yilu2; Wang, Shuai1; Liu, Xingjun2,6,9

2023-10-17

10.1016/j.msea.2023.145280

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   Impact Factor & Quartile

0921-5093

1873-4936

A Heusler Fe2TiSi-phase strengthened 12Mn maraging steel Fe-12Mn-5Co-1Ti-1Mo-1Si was extensively studied using various experimental (EBSD, TEM and uniaxial tensile) techniques. The results indicate that the fine and dispersed Fe2TiSi particles, precipitating within the martensite, were the primary strengthening phase when aged at 450 degrees C regardless of whether the alloy is cold rolled or solid-solution treated. Furthermore, a soft reverted austenite nano-layer was observed at the lath interface, imparting significant toughness to the martensite matrix. By carefully optimizing the aging process parameters, the 12Mn alloy achieved a high tensile strength of-1700 MPa with a moderate elongation of-7% at break.When aged at 400 degrees C, unexpected precipitation of alpha-Mn particles within the martensite structure was observed, displacing the Fe2TiSi phase as the dominant strengthening phase. Simultaneously, elemental Mn segregation was found to occur at the lath interface, instead of the formation of reverted austenite. This Mn segregation layer was identified as the main factor contributing to brittle fracture behavior. These findings illustrate that synergistic improvement of strength and plasticity can be realized via an optimal combination of precipitation strengthening and interfacial layer toughening mechanisms.

Maraging steel Precipitation strengthening Fe 2 TiSi heusler phase Nano-austenite interfacial layer Interfacial segregation

SCI

English

First ; Corresponding

National Natural Science Foundation of China["51971082","52301153"] ; Guangdong Provincial Basic and Applied Basic Research Fund Project-Regional Joint Fund-Youth Fund Project[2022A1515110279] ; Guang- dong Provincial Department of Education University Youth Innovative Talent Research Project[2022KQNCX068] ; Key-Area Research Project of the Guangdong Province Department of Education[2022ZDZX3021]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:001083737000001

ELSEVIER SCIENCE SA

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
2.Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.Shandong First Med Univ & Shandong Acad Med Sci, Coll Artificial Intelligence & Big Data Med Sci, Jinan 250117, Peoples R China
4.Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China
5.Xiamen Univ, Fujian Prov Key Lab Mat Genome, Xiamen 361005, Peoples R China
6.Harbin Inst Technol, Inst Mat Genome & Big Data, Shenzhen 518055, Peoples R China
7.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Test Ctr, Ningbo 315201, Peoples R China
8.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
9.Harbin Inst Technol, State Key Lab Adv Welding & Joining, Shenzhen 518055, Peoples R China

Yang, Mujin,Huang, Chao,Yao, Zhifu,et al. Development of a high-strength Fe-12Mn maraging steel via designing lath interfacial and intragranular nanostructures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,886.

Yang, Mujin.,Huang, Chao.,Yao, Zhifu.,Yang, Zhijie.,Li, Zhou.,...&Liu, Xingjun.(2023).Development of a high-strength Fe-12Mn maraging steel via designing lath interfacial and intragranular nanostructures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,886.

Yang, Mujin,et al."Development of a high-strength Fe-12Mn maraging steel via designing lath interfacial and intragranular nanostructures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 886(2023).