Auto-tempering-induced nanoprecipitate strengthening of ultrastrong low-alloy high-carbon steel

Jiang，Tao1; He，Binbin2; Sun，Junjie3; Shang，Xuekun2; Yu，Hua1; Xu，Liujie1; Pan，Kunming1; Wei，Shizhong1; Liu，Yongning3; Huang，Mingxin4

2024-08-01

10.1016/j.matchar.2024.114059

Materials Characterization   影响因子和分区

1044-5803

Ultrahigh-strength steels, which have become vital components in energy-efficient structural systems, can be realized by incorporating expensive alloying elements into them. In this study, increasing the strength of a low-alloy high‑carbon steel, by precipitating its granular and rod-like ε-carbides, formed during its auto-tempering and low-temperature tempering, respectively, was explored. The crystallographic orientation relationships between the ε-carbides in the low-alloy high‑carbon steel and its martensitic matrix were determined. The number density and average size of the granular ε-carbides in the steel were 4.8 × 10 m and 2.2 ± 0.5 nm, respectively. The volume fraction of the rod-like ε-carbides in the steel was 4%. The diameters of the rod-like ε-carbides in the steel were between 10 and 20 nm, and their lengths were between 50 and 250 nm. The granular and rod-like ε-carbides in the steel contributed 949 and 70 MPa, respectively, to its yield strength. Thus, the granular ε-carbides were primarily responsible for the ultrahigh yield strength (2250 MPa) of the steel. In addition, the semi-coherent interfaces between the granular ε-carbides and the martensitic matrix in the steel may facilitate dislocation motions without subjecting the steel to severe local stress concentrations, thereby contributing to its total elongation of 11.4%. This study employed inexpensive carbides to produce high-performance steels, leading to a sustainable, lightweight design.

Auto-tempering Grain refinement Precipitation strengthening Ultrahigh strength steel ε-Carbide

SCI ; EI

英语

通讯

20242316219346

Alloying elements ; Carbides ; Energy efficiency ; High strength alloys ; High strength steel ; Strengthening (metal) ; Temperature ; Tempering ; Yield stress

Energy Conservation:525.2 ; Metallurgy:531.1 ; Heat Treatment Processes:537.1 ; Steel:545.3 ; Thermodynamics:641.1 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85195202574

Scopus

1.National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang,Henan,471003,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.School of Materials Science and Engineering,State Key Laboratory for Mechanical Behaviour of Materials,Xi'an Jiaotong University,Xi'an,Shaanxi,710049,China
4.Department of Mechanical Engineering,The University of Hong Kong,Hong Kong,999077,Hong Kong

Jiang，Tao,He，Binbin,Sun，Junjie,et al. Auto-tempering-induced nanoprecipitate strengthening of ultrastrong low-alloy high-carbon steel[J]. Materials Characterization,2024,214.

Jiang，Tao.,He，Binbin.,Sun，Junjie.,Shang，Xuekun.,Yu，Hua.,...&Huang，Mingxin.(2024).Auto-tempering-induced nanoprecipitate strengthening of ultrastrong low-alloy high-carbon steel.Materials Characterization,214.

Jiang，Tao,et al."Auto-tempering-induced nanoprecipitate strengthening of ultrastrong low-alloy high-carbon steel".Materials Characterization 214(2024).