Microstructure and mechanical properties of ultralow carbon high-strength steel weld metals with or without Cu-Nb addition

Yang, Xinghai; Chen, Xiaohua; Pan, Shiwei; Wang, Zidong; Chen, Kaixuan; Li, Dayong; Qin, Junwei

doi:10.1007/s12613-020-2159-0

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…3d. In addition, the coupling effect demonstrated by a solid solution of Nb and Cr atoms is more greater than the effect of a solid solution of Ni atoms in increasing hardenability [18][19][20][21][22] , indicating that Nb and Cr additions instead of Ni lead to decrease in the transformation temperature of austenite to acicular ferrite and bainite. From these facts, the finer interlocking microstructure in the H-Nb steel welds compared to the H-Ni steel welds, as shown in Fig.…”

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%

“…The grain refinement and the formation of bainitic structure by Nb addition instead of Ni can improve both strength and ductility. However, the effect of Nb alloying in welds is controversial [19][20][21] . Nb addition can also lead to grain refinement in the welds, improving mechanical properties.…”

mentioning

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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show abstract

“…This leads to a significant reduction in the mechanical properties of the welded joint, as mentioned in references [12][13][14][15]. In addition, for steel with ultrafine-grained reinforcement, the welding heat input is bound to cause grain growth [16][17][18]. Moreover, because ultra-high-strength steel is highly durable and has a distinct grain structure, it can be challenging to control welding deformation, resulting in significant stress after the welding [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Treatment on Microstructure and Properties of 2000 MPa Ultra-High-Strength Steel-Welded Joints

Chu,

Wang,

Yuan

et al. 2023

Coatings

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The microstructure and mechanical properties of ultra-high-strength steel weld joints were examined for the effect of ultrasonic treatment. ER120S-G welding wire is necessary for welding 4 mm thick ultra-high-strength steel. After that, the weld toe region underwent different parameters of the ultrasonic stress relief process. As a means of surface treatment for weld seams, noticeable grain refinement and the formation of a fine-grained layer were observed in the weld toe region after ultrasonic treatment. The blind hole method was used to measure residual stresses in the weld seam, which indicated a transition from tensile stress to compressive stress in the treated portion of the joint. Different ultrasonic treatment processes resulted in a significant increase in hardness values near the weld toe region during hardness testing. The hardness of the weld joint that was treated with ultrasound increased initially but then stabilized after increasing the frequency. The ultrasound-treated joints showed a significant improvement in both tensile strength and fracture elongation, as demonstrated in the tensile tests.

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“…Under the condition of high wear resistance, the impact toughness of steels is generally poor [21][22][23][24]. Therefore, it is necessary to balance the impact toughness and wear resistance in order to improve the service life of the tools [25][26][27]. Generally speaking, there are many methods to improve the contradictory mechanical properties of steel, such as ultra-pure purification, heat treatment, large forging ratio and so on [21,[28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles

Kou

Dai

Wang

et al. 2022

Metals

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In order to improve the impact toughness and wear resistance of the tool and die steels, this study innovatively prepared strengthened H13 steels with different contents of single-phase TiC and dual-phase TiC + TiB2 through in situ nanoparticle/Al master alloys at room temperature. The microstructure evolution and mechanical properties as well as wear resistance were investigated. Results indicate that the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles has a more uniform and finer microstructure, and the mechanical properties and wear resistance are significantly improved. The yield strength, maximum tensile strength, breaking strain, uniform elongation, product of strength plasticity, and unnotched and U-notched impact toughness of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 are higher than that of H13 steel. In addition, the volume wear rate, maximum scratch depth and width reach 7.1 × 10−11 m3/m, 6050 nm and 90 μm, respectively, which are reduced by 44.5%, 30.1% and 45.5% compared with that of H13 steel. Refining the microstructure and improving impact toughness and wear resistance of H13 tool steel through trace nanoparticles can provide important inspiration for industrial applications.

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Microstructure and mechanical properties of ultralow carbon high-strength steel weld metals with or without Cu-Nb addition

Cited by 7 publications

References 39 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

Effect of Ultrasonic Treatment on Microstructure and Properties of 2000 MPa Ultra-High-Strength Steel-Welded Joints

Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles

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