Low-carbon advanced nanostructured steels Microstructure, mechanical properties, and applications

Translated title of the contribution: 新型低碳纳米钢: 微观组织、机械性能与应用

Haojie Kong, Zengbao Jiao, Jian Lu, Chain Tsuan Liu

Research output: Journal article publicationReview articleAcademic researchpeer-review

Abstract

Low-carbon advanced nanostructured steels have been developed for various structural engineering applications, including bridges, automobiles, and other strength-critical applications such as the reactor pressure vessels in nuclear power stations. The mechanical performances and applications of these steels are strongly dependent on their microstructural features. By controlling the size, number density, distribution, and types of precipitates, it is possible to produce nanostructured steels with a tensile strength reaching as high as 2 GPa while keeping a decent tensile elongation above 10% and a reduction of area as high as 40%. Besides, through a careful control of strength contributions from multiple strengthening mechanisms, the nanostructured steels with superior strengths and low-temperature impact toughness can be obtained by avoiding the temper embrittlement regime. With appropriate Mn additions, these nanostructured steels can achieve a triple enhancement in ductility (total tensile elongation, TE of ∼30%) at no expense of strengths (yield strength, YS of ∼1100 to 1300 MPa, ultimate tensile strength, UTS of ∼1300 to 1400 MPa). More importantly, these steels demonstrate good fabricability and weldability. In this paper, the microstructure-property relationships of these advanced nanostructured steels are comprehensively reviewed. In addition, the current limitations and future development of these nanostructured steels are carefully discussed and outlined.

Translated title of the contribution新型低碳纳米钢: 微观组织、机械性能与应用
Original languageChinese (Simplified)
JournalScience China Materials
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • dislocation interactions
  • embrittlement
  • heterogeneous
  • nano-precipitates
  • strength-ductility paradox

ASJC Scopus subject areas

  • Materials Science(all)

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