TY - JOUR
T1 - Low-carbon advanced nanostructured steels Microstructure, mechanical properties, and applications
AU - Kong, Haojie
AU - Jiao, Zengbao
AU - Lu, Jian
AU - Liu, Chain Tsuan
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (51801169), Hong Kong Research Grant Council (CityU Grant 9360161, 9042635, 9042879), and the internal funding from the City University of Hong Kong (CityU 9380060).
Publisher Copyright:
© 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2021/7
Y1 - 2021/7
N2 - 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.[Figure not available: see fulltext.]
AB - 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.[Figure not available: see fulltext.]
KW - dislocation interactions
KW - embrittlement
KW - heterogeneous
KW - nano-precipitates
KW - strength-ductility paradox
UR - http://www.scopus.com/inward/record.url?scp=85103183865&partnerID=8YFLogxK
U2 - 10.1007/s40843-020-1595-2
DO - 10.1007/s40843-020-1595-2
M3 - Review article
AN - SCOPUS:85103183865
SN - 2095-8226
VL - 64
SP - 1580
EP - 1597
JO - Science China Materials
JF - Science China Materials
IS - 7
ER -