Effect of Nb addition on microstructure and mechanical properties of 25CrNiMoV (DZ2) steel for high-speed railway axles

Zhang, Jin-wen; Cao, Yan-guang; Zhang, Cheng-guo; Li, Zhaodong; Wang, Wenxian

doi:10.1007/s42243-021-00613-2

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…In addition to the above alloying elements, many elements, such as Si, Mn, Nb, etc., can be alloyed for hot-working die steel to keep the content within the range of optimal steel performance [ 73 , 74 ]. Through continual exploration of alloy composition in hot-working die steel, the performance of die steel has been continuously enhanced, resulting in the development in successive series of hot-working die steel.…”

Section: Development In Microstructure Manipulation and Strengthening...mentioning

confidence: 99%

Development Trend in Composition Optimization, Microstructure Manipulation, and Strengthening Methods of Die Steels under Lightweight and Integrated Die Casting

Bao,

Yang,

Dong

et al. 2023

Materials

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In the general environment of lightweight automobiles, the integrated die-casting technology proposed by Tesla has become the general mode to better achieve weight reduction in automobiles. The die-casting mold required by integrated die-casting technology has the characteristics of large scale and complexity. Hence, higher requirements are put forward for the comprehensive performance of the die steel. Despite the stagnation in the progress of conventional strengthening methods, enhancing the performance of die steel has become increasingly challenging. Indeed, it necessitates exploring novel die steel and optimizing heat treatment and reinforcement technologies. This article summarizes and analyzes the development status of die steel and corresponding heat treatment and microstructure manipulation as well as strengthening methods and elaborates on an excellent nano-strengthening technology. Furthermore, this review will aid researchers in establishing a comprehensive understanding of the development status of die steel and the processes utilized for its strengthening. It will also assist them in developing die steel with improved comprehensive performance to meet the high demand for mold steel in the integrated die-casting technology of the new era.

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Section: Development In Microstructure Manipulation and Strengthening...mentioning

confidence: 99%

Development Trend in Composition Optimization, Microstructure Manipulation, and Strengthening Methods of Die Steels under Lightweight and Integrated Die Casting

Bao,

Yang,

Dong

et al. 2023

Materials

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“…Although many scholars have studied the growth behavior of the austenite grains of 22MnB5 in the hot stamping process, there are few reports on the selection of the hot stamping parameters, microstructure evolution, austenite grain distribution and mechanical properties of UHSHSS after alloying with Nb and V elements. Generally, during the solidification of steel, Nb, V, and other microalloying elements form second-phase particles during the solidification and cooling of steel, which have the effect of pinning grain boundaries and dispersion strengthening [19][20][21][22][23][24]. Liang et al [25] found that the addition of Nb element can promote the refinement of austenite grains, which has a significant advantage in improving the tensile strength and yield strength of UHSHSS.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

Liu

Long

et al. 2022

Materials

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Clarifying the influence of Nb and V microalloying on the ultra-high strength hot stamping steel (UHSHSS) and exploring appropriate process parameters are the basis for effectively regulating properties of the final product. In this study, the effects of different austenitizing temperatures and holding times on the phase transitions, grain sizes and mechanical properties of 22MnB5NbV with Nb and V alloyed are studied by using JMatPro thermodynamic calculations and experiments. By comparing with 22MnB5 without Nb and V alloyed, the effects of Nb and V elements on quenching microstructures, grain sizes and mechanical properties of UHSHSS are analyzed. The suitable austenitizing process parameters of 22MnB5NbV have been obtained. The results show that the grain size of Nb-V-alloyed UHSHSS grows with the increase in the austenitizing temperature and holding time. The 22MnB5NbV steel can be completely austenitized while the austenitizing temperatures ≥870 °C and holding time ≥3 min. Combined with the actual production process, the best austenitizing temperature and holding time are 930 °C and 3 min. Under these conditions, the average grain size is 7.7 μm, the tensile strength, elongation and strength-ductility product are 1570.8 MPa, 6.6% and 10.4 GPa·%, respectively. With the addition of Nb and V elements, the nanoscale precipitates lead to the refinement of the quenched structure and grain size, and the comprehensive properties of UHSHSS have been effectively promoted, in which the elongation and strong-plastic products are increased by ~0.6% and ~1.2 GPa·%, respectively.

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“…Nanoparticles have a strong effect of microstructure refinement [44][45][46]. Nanoparticles not only can refine the microstructure and control the growth size and morphology of grains [47][48][49][50][51], but also greatly improve the comprehensive mechanical properties of the alloys, especially, high-temperature strength, high-temperature creep, high-temperature wear resistance, impact toughness and fatigue [52][53][54][55][56][57]. Compared with traditional strengthening and toughening technology, the effective control technology by nanoparticles has significant advantages such as not changing the existing casting process and equipment, green and environmental protection [58][59][60].…”

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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Effect of Nb addition on microstructure and mechanical properties of 25CrNiMoV (DZ2) steel for high-speed railway axles

Cited by 9 publications

References 21 publications

Development Trend in Composition Optimization, Microstructure Manipulation, and Strengthening Methods of Die Steels under Lightweight and Integrated Die Casting

Development Trend in Composition Optimization, Microstructure Manipulation, and Strengthening Methods of Die Steels under Lightweight and Integrated Die Casting

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

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

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