Effects of Mn content and annealing temperature on the microstructure of a G-phase strengthened Fe–20Cr–Ni–Si–Ti ferritic steel

Yang，Mujin1,2; Yang，Zhijie1; Ke，Dingning3; Huang，Chao1; Yao，Zhifu1; Li，Zhou4; Wang，Cuiping5; Wang，Shuai2; Liu，Xingjun1,6,7

2023-03-03

10.1016/j.msea.2022.144554

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

0921-5093

Effect of Mn content and annealing temperature on the microstructure of a classic G-phase strengthened Fe–20Cr–3Ni–3Si–1Ti ferritic steel was extensively examined using advanced electron microscopy techniques (SEM, EBSD and TEM) and theoretical predictions (thermodynamic calculation). Firstly, a ternary precipitating phase named τ (FeTiSi) which is isotypic to the structure of α-Mn (I-43m), existing at high-temperature (∼1050 °C), was discovered for the first time. Secondly, the ferrite matrix was observed to decompose into the mixture of the martensite, austenite and σ-phase at the mid-temperature region (700–850 °C). Thirdly, the nano-sized G-phase was discovered at both the intragranular sites and the grain boundaries after aging at 550 °C, behaving a strong over-aging resistance with the increased Mn content. Finally, phase stabilities of the detected τ, σ, G, ferrite, martensite and austenite phases with different Mn content were discussed under different annealing temperatures. These findings pave a new pathway to design the microstructure of G-phase steel via optimal annealing strategies.

G-phase Microstructural evolution Multicomponent alloys Precipitation strengthening

English

Others

MATERIALS SCIENCE

2-s2.0-85147543629

Scopus

1.Department of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen,Guangdong,518055,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Blvd,518055,China
3.Education Center of Experiments and Innovations,Harbin Institute of Technology,Shenzhen,518055,China
4.College of Artificial Intelligence and Big Data for Medical Science,Shandong First Medical University & Shandong Academy of Medical Sciences,Jinan,250117,China
5.College of Materials and Fujian Provincial Key Laboratory of Materials Genome,Xiamen University,Xiamen,361005,China
6.Institute of Materials Genome and Big Data,Harbin Institute of Technology,Shenzhen,518055,China
7.State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Shenzhen,150001,China

Yang，Mujin,Yang，Zhijie,Ke，Dingning,等. Effects of Mn content and annealing temperature on the microstructure of a G-phase strengthened Fe–20Cr–Ni–Si–Ti ferritic steel[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,867.

Yang，Mujin.,Yang，Zhijie.,Ke，Dingning.,Huang，Chao.,Yao，Zhifu.,...&Liu，Xingjun.(2023).Effects of Mn content and annealing temperature on the microstructure of a G-phase strengthened Fe–20Cr–Ni–Si–Ti ferritic steel.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,867.

Yang，Mujin,et al."Effects of Mn content and annealing temperature on the microstructure of a G-phase strengthened Fe–20Cr–Ni–Si–Ti ferritic steel".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 867(2023).