Cluster mediated high strength and large ductility in a strip casting micro-alloyed steel

Huang，Yuhe1,2; Xu，Shuai1; Li，Xueqiao3; Gao，Junheng1,2; Zhao，Haitao1,2; Wang，Shuize1,2; Yang，Tao4; Liu，Shifeng5; Han，Xiaodong6; Mao，Xinping1,2

2024-09-01

10.1016/j.actamat.2024.120102

Acta Materialia   影响因子和分区

1359-6454

Exhibiting exceptional mechanical properties and formability, high strength low alloy steels characterized by a single ferrite microstructure with finely dispersed nano-precipitates (ferritic HSLA steel) have garnered notable attention in the automotive industry. Nevertheless, to maximally utilize the precipitation hardening effect, these steels necessitate substantial additions of carbide-forming elements, unavoidably narrowing the process window and escalating the cost. Strip casting, featuring a streamlined process chain and high energy efficiency, has emerged as a promising technique for developing ferritic HSLA steels. In this work, leveraging the process characteristics of strip casting, we report that a novel single ferrite microstructure with multi-atomic layered clusters distributed in both interphase-precipitation and random fashions was engineered in a low Nb micro-alloyed ferritic HSLAs via raising the coiling temperature to 650 ℃. The multi-atomic layered clusters play a pivotal role in tailoring dislocation behaviors, facilitating local double cross-slips, contributing to dislocation multiplication and homogeneous distribution. These mechanisms collectively sustain mild work hardening to higher strains, leading to combined strength and ductility increments. In comparison to their cluster-free bainitic counterparts coiled at 480 ℃, the results demonstrate significant mechanical improvements with an increase in ultimate strength (630 MPa to 670 MPa) and a 90 % rise in plasticity (10.3 % to 19.1 %), signifying an alternative pathway for advancing the utilization of strip casting technology in designing and processing novel low-cost, high-performance HSLAs.

In-situ tensile Interphase/Random clustering Mechanical property Multi-atomic layer cluster

SCI ; EI

英语

其他

20242516284421

Atoms ; Automotive industry ; Carbides ; Ductility ; Energy efficiency ; High strength alloys ; High strength steel ; Microalloying ; Microstructure ; Niobium compounds ; Precipitation (chemical) ; Strain hardening

Energy Conservation:525.2 ; Metallurgy:531.1 ; Metallography:531.2 ; Heat Treatment Processes:537.1 ; Steel:545.3 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85196162282

Scopus

1.Research Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing,100083,China
2.Institute of Steel Sustainable Technology,Liaoning Academy of Materials,Shenyang,110000,China
3.Institute of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing,100124,China
4.Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,Hong Kong
5.School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an,Shaanxi,710055,China
6.Department of Materials Science and Engineering,Southern University of Science and Technology,Guangdong,518055,China

Huang，Yuhe,Xu，Shuai,Li，Xueqiao,et al. Cluster mediated high strength and large ductility in a strip casting micro-alloyed steel[J]. Acta Materialia,2024,276.

Huang，Yuhe.,Xu，Shuai.,Li，Xueqiao.,Gao，Junheng.,Zhao，Haitao.,...&Mao，Xinping.(2024).Cluster mediated high strength and large ductility in a strip casting micro-alloyed steel.Acta Materialia,276.

Huang，Yuhe,et al."Cluster mediated high strength and large ductility in a strip casting micro-alloyed steel".Acta Materialia 276(2024).