Microstructure and mechanical properties of Nb microalloyed high‑carbon pearlitic steels subjected to isothermal transformation

Su, Xue; Zhou, Mingxing; Zhu, Min; Wang, Houxin; Zhang, Qi; Tian, Junyu; Xu, Guang

doi:10.1016/j.matchar.2023.113013

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…The temperature of austenitization was shown to be associated with the strengthening mechanism of Nb in high-carbon pearlitic steels. Nb's strength increased at a lower austenitization temperature (900 • C) as a result of precipitation and grain refinement strengthening [24]. The microstructure and mechanical characteristics of medium carbon bainitic steel with a weight percentage of 0.018 Nb microalloying element were examined by Zhanf et al The greater yield strength and work hardening capacity of Nb steel may be attributed to the finer bainitic ferrite plates and the higher average carbon concentration of residual austenite [25].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Niobium Addition and Pre-Annealing on the Tensile Properties of 52CrMoV4 Spring Steel

Ozuyagli,

Barlas,

Ozsarac

et al. 2024

Materials

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In this study, the effect of niobium addition and a specific preheating process on the microstructure and tensile properties of 52CrMoV4 steel used in leaf springs was investigated. Flat and leaf spring materials were used to accomplish this aim. The flat materials under investigation were kept in a furnace for 90 min at 900 °C. A homogeneous microstructure was aimed for with the use of this pre-annealing heat treatment in addition to the standard process before rolling used to create NbC. Leaf spring production was carried out with flat materials that possessed various Nb contents, with or without pre-heating. Grain size measurement and tensile tests were performed on the flat and leaf springs. Additionally, scanning electron microscopy images were captured from the fractured surfaces after the tensile tests were carried out. The current study highlights the importance of Nb addition as an alloying element and the effect of the selected pre-annealing process in optimizing the grain structure and enhancing the tensile properties of leaf springs. The leaf spring with a Nb ratio of 0.0376 that was pre-annealed exhibited a finer grain structure (G = 11.3), greater tensile properties (YS = 1550 N/mm2 and UTS = 1688.6 N/mm2), and deeper tear valleys and larger dimples, indicating higher energy consumption during fracturing, according to the SEM images produced, in contrast with the other materials studied.

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Section: Resultsmentioning

confidence: 99%

The Effect of Niobium Addition and Pre-Annealing on the Tensile Properties of 52CrMoV4 Spring Steel

Ozuyagli,

Barlas,

Ozsarac

et al. 2024

Materials

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“…Si 含量普遍控制在 0.5-0.8wt.%之间 [67] 。另外，以 V 或者 V+Nb 析出强化和细晶强化作用提升珠光体钢的强度也是目前珠光体钢微合金化的主要策略之一，如国内广泛使用的 U75V 珠光体钢轨。在奥氏体向珠光体转变过程中，钒在铁素体中以纳米级碳化物形式析出，对珠光体钢起到显著的强化作用，但若在高温奥氏体相中析出较大尺寸的碳化钒，其强化效果则会明显降低 [78,81,82] 。与含钒珠光体钢相比， V+Nb 合金化能够更有效细化珠光体团尺寸，降低碳的扩散系数，进一步细化珠光体片间距，因此， V+Nb 合金化后珠光体钢可以在保持原有强度的同时，获得更高的韧性 [81] [71] 。同时，详细研究了钢轨热加工过程中各工艺参数对 80CrSiV 珠光体钢轨钢组织及性能的影响，明确了冷却速度和终冷温度对钢轨钢内珠光体片间距的影响规律，如图 18 所示 [72]…”

Section: %后会恶化钢轨的焊接性能。因此，珠光体钢轨钢中的unclassified

铁路轨道用钢研究进展

Chen,

Kang,

Feng

et al. 2024

Sci. Sin.-Tech.

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“…Some researches indicate that the grain refinement effect of Nb is greater than that of coarsening interlamellar spacing during hot rolling deformation [17]. The effects of strong carbide formers on the mechanical properties of pearlitic steels can summarized as follows [17][18][19][20][21]: increase the strength by decreasing the lamellar spacing and the smaller nodule size and more uniform grain size distribution; decrease the reduction in area by increments in austenite grain size and carbide plate thickness.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Alloying on the Strength and Ductility of High Carbon Pearlitic Steel

Min,

Zhu,

Fan

et al. 2023

Metals

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In this work, the effects of the micro-alloying of Mn, Ni, and Si on the microstructure and mechanical properties of high-carbon pearlite steels were investigated. The results indicated that the addition of solely Ni to high-carbon pearlitic steel can enhance the strength through the refinement of interlamellar spacing, but work-hardening in the ferrite of the pearlite colony may be delayed, leading to a reduction in area. The multiple additions of Ni and the increase in Mn and Si contents in high-carbon pearlitic steel were beneficial to obtaining a balance between ultimate tensile strength and reduction in area. Three-dimensional atom probe tomography results showed Si partitioning into ferrite and Mn and Ni elements partitioning into cementite. The addition of Si inhibited the formation of a continuous network of grain-boundary cementite, leading to high strength and high ductility through optimization of the microstructure.

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Microstructure and mechanical properties of Nb microalloyed high‑carbon pearlitic steels subjected to isothermal transformation

Cited by 9 publications

References 38 publications

The Effect of Niobium Addition and Pre-Annealing on the Tensile Properties of 52CrMoV4 Spring Steel

The Effect of Niobium Addition and Pre-Annealing on the Tensile Properties of 52CrMoV4 Spring Steel

铁路轨道用钢研究进展

Synergistic Effect of Alloying on the Strength and Ductility of High Carbon Pearlitic Steel

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