Effect of nickel on hardening behavior and mechanical properties of nanostructured bainite-austenite steels

Dong, Hangyu; Hu, Chengyang; Wu, Guanghui; Wu, Kaiming; Misra, R.D.K.

doi:10.1016/j.msea.2021.141410

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…Their compositions in the welds are Fe-0.08C-0.72Si-1.83Mn-1.44Ni-0.010Nb-0.34Cr-Ti-Mo (wt%) (1.0 GPa H-Ni steel weld, see Table 1 ) and Fe-0.11C-0.37Si-2.2Mn-1.13Ni-0.016Nb-0.34Cr-Ti-Mo (wt%) (1.2 GPa H-Ni steel weld, see Table 1 ), respectively. Ni increases the hardenability, promoting the formation of bainite in the welds 24 , 25 . Additionally, Ni, as a strong austenite stabilizing element, aids the formation of retained austenite, improving ductility 25 , 26 .…”

Section: Resultsmentioning

confidence: 99%

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Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite

Moon,

Bae,

Jeong

et al. 2024

Nat Commun

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The degradation of mechanical properties caused by grain coarsening or the formation of brittle phases during welding reduces the longevity of products. Here, we report advances in the weld quality of ultra-high strength steels by utilizing Nb and Cr instead of Ni. Sole addition of Cr, as an alternative to Ni, has limitations in developing fine weld microstructure, while it is revealed that the coupling effects of Nb and Cr additions make a finer interlocking weld microstructures with a higher fraction of retained austenite due to the decrease in austenite to acicular ferrite and bainite transformation temperature and carbon activity. As a result, an alloying design with Nb and Cr creates ultrastrong and ductile steel welds with enhanced tensile properties, impact toughness, and fatigue strength, at 45% lower material costs and lower environmental impact by removing Ni.

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Section: Resultsmentioning

confidence: 99%

“…Ni increases the hardenability, promoting the formation of bainite in the welds 24 , 25 . Additionally, Ni, as a strong austenite stabilizing element, aids the formation of retained austenite, improving ductility 25 , 26 . However, excessive use of Ni increases product costs and is considered an environmental burden 27 .…”

Section: Resultsmentioning

confidence: 99%

Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite

Moon,

Bae,

Jeong

et al. 2024

Nat Commun

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On the continuous cooling transformation of deformed austenite and relationship to properties in medium-Mn steel

Dong

Tao²,

Sun³

et al. 2022

J Mater Sci

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Tailoring the Microstructure using Quenching and Partitioning Processing in a Commercial Mn-Si-Cr Spring Steel to Improve Tensile Properties

Masoumi,

Centeno,

Echeverri

2024

Arab J Sci Eng

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This study explores a novel approach to quenching and partitioning (Q&P) heat treatment applied to AISI 9260 spring steel, comprising Fe-0.65C-1.58Mn-1.05Si-0.41Cr (wt.%). Our research focuses on balancing strength and ductility through optimized Q&P pathways, leading to a diverse microstructure that includes martensite, bainite, carbide, and retained austenite. Advanced X-ray diffraction and scanning electron microscopy techniques were employed to analyze the complexities of this microstructure. A key aspect of this study is the precise control of partitioning temperature and time, crucial for modulating lattice distortion and dislocation density within martensitic and bainitic structures. Optimal partitioning temperature promotes carbon distribution into austenite, tempering lattice distortions, and dislocation densities. Concurrently, carbide precipitation and segregation contribute to the refinement of the bainite phase. The sample quenched at 125 °C and partitioned at 350 °C (Q&P-125/350) demonstrates notable mechanical properties: a yield strength of 950 ± 15 MPa, an ultimate tensile strength of 1710 ± 15 MPa, and an elongation of approximately 9.7%. These results are partly attributed to the effect of silicon in preventing cementite coarsening and the effective distribution of carbide. Our findings highlight the potential of Q&P heat treatment in developing tailored microstructures with enhanced mechanical properties in steel, without relying on costly alloying elements. This approach presents new avenues for the design and application of high-performance materials.

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Effect of nickel on hardening behavior and mechanical properties of nanostructured bainite-austenite steels

Cited by 8 publications

References 34 publications

Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite

Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite

On the continuous cooling transformation of deformed austenite and relationship to properties in medium-Mn steel

Tailoring the Microstructure using Quenching and Partitioning Processing in a Commercial Mn-Si-Cr Spring Steel to Improve Tensile Properties

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