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Investigation of the impact of process parameters and thermal treatments on mechanical properties and microstructure of ScanCromAl ® manufactured via powder bed fusion laser beam process 研究工艺参数和热处理对通过粉末床熔融激光束工艺制造的 ScanCromAl ® 的机械性能和微观结构的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-24 DOI: 10.1016/j.jmrt.2024.09.189
Raúl Gómez, Jon Aranzabe, Fermin Garciandia, Ane Miren Mancisidor, Maria San Sebastian
This study explores the processability window of a newly developed aluminium alloy for laser beam powder bed fusion (PBF-LB/M). The impact of the volumetric energy density on the melt pool shape, microstructure, and mechanical properties of manufactured parts are evaluated. Additionally, thermal treatments are optimized to tailor precipitation hardening mechanisms. The results demonstrate the promising potential of this material, exhibiting high relative density (>99.90%) and competitive mechanical properties for the thermally treated samples (UTS ranging from 486 MPa to 514 MPa with elongation of 11–30%). EBSD analysis reveals a characteristic bimodal microstructure of fine equiaxed grains at grain boundaries and elongated coarse grains aligned along the melt pool direction. This work provides valuable insights for tailoring the processing parameters and optimizing the performance of this novel material for diverse applications.
本研究探讨了一种新开发的用于激光束粉末床熔化(PBF-LB/M)的铝合金的加工性窗口。研究评估了体积能量密度对熔池形状、微观结构和制件机械性能的影响。此外,还对热处理进行了优化,以定制沉淀硬化机制。结果表明,这种材料潜力巨大,热处理后的样品具有较高的相对密度(99.90%)和良好的机械性能(UTS 从 486 兆帕到 514 兆帕不等,伸长率为 11-30%)。EBSD 分析揭示了一种特征性的双峰微观结构,即晶界处的细小等轴晶和沿熔池方向排列的细长粗粒。这项研究为定制加工参数和优化这种新型材料的性能提供了有价值的见解,可用于多种应用。
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引用次数: 0
A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility 具有高屈服强度和大延展性的新型高锰双相孪生诱导塑性轻质钢
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-24 DOI: 10.1016/j.jmrt.2024.09.198
Huihui Zhi , Jinshan Li , Lulu Li , Yihua Luo , Yanjing Su , Minjie Lai
In this study, we report a novel high-Mn Fe–21Mn–6Al–4Si–1C (wt.%) duplex lightweight steel with concurrent chemical ordering and twinning-induced plasticity effects. This steel is capable of achieving an exceptional combination of strength and ductility following either cold-rolling and annealing at 1000 °C or subsequent short-term aging at 550 °C. In its as-annealed state, this steel primarily consists of γ-austenite and α-ferrite, with α-ferrite appearing as dispersed particles within fully recrystallized γ grains. Furthermore, L′12- and D03-type ordered nanodomains exist within these two phases, respectively. The aging treatment negligibly affects the size and volume fraction of both the γ-austenite and α-ferrite, yet it enhances the degree of ordering as well as the size and volume fraction of their ordered nanodomains, leading to a rise in yield strength from ∼800 to ∼1062 MPa and a decline in total elongation from ∼60.4% to ∼44.4%. The high yield strength of this steel originates from multiple strengthening mechanisms involving dislocation interactions with solute atoms, ordered nanodomains, γ grain boundaries and γ/α phase boundaries. This steel plastically deforms via planar slip during the initial stages. The rather small γ grain size, coupled with the presence of hard α-ferrite particles, fosters the dynamic slip band refinement (DSBR) effect, thereby enhancing the flow stress sufficiently to trigger deformation twinning in the steel during the later stages. The DSBR effect, combined with the progressive formation of deformation twins, stacking faults and Lomer-Cottrell locks, imparts pronounced strain hardenability to this steel, leading to its outstanding ductility.
在本研究中,我们报告了一种新型高锰 Fe-21Mn-6Al-4Si-1C(重量百分比)双相轻质钢,它同时具有化学有序和孪生诱导塑性效应。这种钢在经过 1000 °C 的冷轧和退火或随后在 550 °C 的短期时效处理后,能够获得优异的强度和延展性组合。在退火状态下,这种钢主要由γ-奥氏体和α-铁素体组成,α-铁素体以分散颗粒的形式出现在完全再结晶的γ晶粒中。此外,在这两种相中分别存在 L′12 型和 D03 型有序纳米域。时效处理对γ-奥氏体和α-铁素体的尺寸和体积分数的影响微乎其微,但却提高了有序化程度及其有序纳米域的尺寸和体积分数,从而使屈服强度从 800 MPa 上升到 1062 MPa,总伸长率从 60.4% 下降到 44.4%。这种钢的高屈服强度源于多种强化机制,包括位错与溶质原子的相互作用、有序纳米域、γ 晶界和 γ/α 相界。这种钢在初始阶段通过平面滑移产生塑性变形。γ晶粒尺寸相当小,加上存在坚硬的α铁氧体颗粒,促进了动态滑移带细化(DSBR)效应,从而充分提高了流动应力,在后期阶段引发了钢的变形孪生。DSBR 效应与变形孪晶、堆叠断层和 Lomer-Cottrell 锁的逐渐形成相结合,赋予了这种钢明显的应变硬化性,从而使其具有出色的延展性。
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引用次数: 0
Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track CuCr0.8 基质表面状态的激光吸收率对激光定向能沉积镍铬合金 718 单通道特性的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-23 DOI: 10.1016/j.jmrt.2024.09.178
Baopeng Zhang , Haifeng Xiao , Weicheng Wang , Feiyang Li , Yun Wang , Haihong Zhu
An effective method for fabricating copper-nickel bimetallic liquid rocket engine thrust chambers involves utilizing laser directed energy deposition (LDED) technology. However, the state of the substrate surface significantly impacts the LDED process. This study investigates the effects of various substrate treatments on LDED single tracks, using CuCr0.8 high-copper alloy as the substrate and Inconel 718 as the deposition material. The treatments include polishing, sandblasting, laser etching, and cold spraying. Substrate surface roughness, laser absorptivity, molten pool morphology, and microstructure were characterized, and the mechanisms of laser absorptivity change and the different LDED processes were analyzed. The results indicate that the laser-etched surface exhibits the worst surface roughness (Ra 15.20 ± 0.60 μm), the highest laser absorptivity(80.70% at 1080 nm wavelength), the largest deposition width (947.33 ± 29.85 μm), and the maximum number of fine grains among the four substrates. Additionally, the cold-sprayed surface shows the largest deposition depth (237.33 ± 39.04 μm), the minimum number of fine grains and a higher laser absorptivity (66.20% at 1080 nm wavelength). In situ observations of molten pool formation and flow during LDED was conducted using an in situ high-speed high-resolution imaging system. The mechanisms underlying the alteration in laser absorptivity primarily involve the "trapped light" effect and modifications to the surface material. This research is significant as it provides foundational insights for laser processing of highly reflective materials, offering important theoretical and practical implications for engineering applications.
利用激光定向能沉积(LDED)技术是制造铜镍双金属液体火箭发动机推力室的有效方法。然而,基底表面的状态会对 LDED 过程产生重大影响。本研究以 CuCr0.8 高铜合金为基底,Inconel 718 为沉积材料,研究了各种基底处理对 LDED 单轨的影响。处理方法包括抛光、喷砂、激光蚀刻和冷喷涂。对基底表面粗糙度、激光吸收率、熔池形态和微观结构进行了表征,并分析了激光吸收率变化和不同 LDED 过程的机理。结果表明,在四种基底中,激光蚀刻表面的表面粗糙度最差(Ra 15.20 ± 0.60 μm),激光吸收率最高(1080 nm 波长下为 80.70%),沉积宽度最大(947.33 ± 29.85 μm),细晶粒数量最多。此外,冷喷表面显示出最大的沉积深度(237.33 ± 39.04 μm)、最少的细粒数量和更高的激光吸收率(1080 nm 波长下为 66.20%)。利用原位高速高分辨率成像系统对 LDED 过程中熔池的形成和流动进行了原位观测。激光吸收率的变化机制主要涉及 "困光 "效应和表面材料的改变。这项研究意义重大,因为它为高反射材料的激光加工提供了基础性见解,为工程应用提供了重要的理论和实践意义。
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引用次数: 0
Experimental study on the ballistic performance of CFRP/AFB sandwich plate CFRP/AFB 夹层板弹道性能实验研究
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-21 DOI: 10.1016/j.jmrt.2024.09.163
Yanyan Chu , Xian Zhao , Jingyu Xu , Xucai Wang , Baokun Zhu , Yue Zhang , Weihan Huang , Chunxiao Chen , Tao Peng
Lightweight bulletproof plate is highly demanded in the field of security field. A novel plate of carbon fiber reinforced plate (CFRP)/aramid filament bundles (AFB) sandwich plate is manufactured through winding methods in this paper. The ballistic performance is evaluated and failure mechanism is explored on the designed six CFRP/AFB sandwich plates. It is found that the sandwich structure of 3-4 × 16 is the best structure by comprehensively considering the energy absorption, Coefficient of Variation(CV) and shaping difficulty, of which the v50 and the average energy absorption are 225.26 m/s and 150.60 J, respectively. In addition, for the case that the number of filaments in the first entanglement is more and the number of first entanglement in the secondary entanglement is less, the ballistic performance would be better. To the failure mechanism, the upper CFRP is damaged by shear failure and the bottom CFRP shows delamination and separation in the impact process. The filament bundle plate in the core layer is benefit in resistance to projectile impact and it fails mainly by the disintegration and bending. This novel CFRP/AFB sandwich plate is a new direction for producing ballistic proof plate.
轻质防弹板在安全领域的需求量很大。本文通过缠绕方法制造了一种新型碳纤维增强板(CFRP)/芳纶丝束(AFB)夹层板。对所设计的六块 CFRP/AFB 夹层板的弹道性能进行了评估,并探讨了其失效机理。综合考虑能量吸收、变异系数(CV)和成型难度,发现 3-4 × 16 的夹层结构为最佳结构,其中 v50 和平均能量吸收分别为 225.26 m/s 和 150.60 J。此外,在第一缠结丝数较多、第二缠结丝数较少的情况下,弹道性能会更好。从破坏机理来看,上层 CFRP 因剪切破坏而损坏,下层 CFRP 在撞击过程中出现分层和分离。芯层中的丝束板在抗弹丸冲击方面具有优势,主要以解体和弯曲的方式失效。这种新型 CFRP/AFB 夹层板是生产防弹板的一个新方向。
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引用次数: 0
Additively manufactured FeCoNiSi0.2 alloy with excellent soft magnetic and mechanical properties through texture engineering 通过质构工程快速制造出具有优异软磁和机械性能的 FeCoNiSi0.2 合金
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-21 DOI: 10.1016/j.jmrt.2024.09.171
Yang Yang , Tianhai Liao , Yiwang Jia , Guodong Ding , Jiangping Cao , Xiaojuan Shang , Yaxiong Guo , Qibin Liu
High-entropy alloys are widely used as structural materials and hold potential as functional materials. This study aims to develop a soft magnetic medium entropy alloy FeCoNiSi0.2 (Si0.2 MEA) with excellent soft magnetic properties and higher ductility using additive manufacturing technology. The microstructure of Si0.2 MEA is characterized by texture and large grains, with a single FCC phase structure. The texture strength of MEA initially increases and then decreases with the addition of Si, with Si0.1 MEA exhibiting the strongest fiber texture. Among the four FeCoNiSix MEAs, Si0.2 MEA demonstrates the best tensile properties (i.e. δ ∼39 %, σ0.2–287 MPA, σb∼551 MPa). The correlation generalized stacking fault energy calculation model indicates that Si0.2 MEA has the lowest generalized stacking fault energy (∼7 mJ/m2), suggesting superior ductility. The synergistic effect of texture and large grains promotes the formation of a magnetization “easy axis”, which makes Si0.2 MEA exhibit the best soft magnetic properties (Ms:150emu/g, Hc:1.04Oe). These results provide a new paradigm for developing laser additively manufactured soft magnetic medium entropy alloy.
高熵合金被广泛用作结构材料,并具有作为功能材料的潜力。本研究旨在利用快速成型技术开发一种具有优异软磁性能和更高延展性的软磁中熵合金 FeCoNiSi0.2 (Si0.2 MEA)。Si0.2 MEA 的微观结构以纹理和大晶粒为特征,具有单 FCC 相结构。MEA 的纹理强度最初随着 Si 的添加而增加,然后降低,其中 Si0.1 MEA 的纤维纹理强度最高。在四种 FeCoNiSix MEA 中,Si0.2 MEA 的拉伸性能最好(即 δ∼39 %,σ0.2-287 MPA,σb∼551 MPa)。相关的广义堆积断层能计算模型表明,Si0.2 MEA 的广义堆积断层能最低(∼7 mJ/m2),这表明其延展性更好。纹理和大晶粒的协同作用促进了磁化 "易轴 "的形成,从而使 Si0.2 MEA 表现出最佳的软磁特性(Ms:150emu/g,Hc:1.04Oe)。这些结果为开发激光添加制造的软磁中熵合金提供了新的范例。
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引用次数: 0
Effect of temperature on the microstructure and mechanical properties of TiC/Fe matrix composites fabricated by spark plasma sintering 温度对火花等离子烧结制造的 TiC/Fe 基复合材料微观结构和机械性能的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-18 DOI: 10.1016/j.jmrt.2024.09.121
Chuan Wang , Yong Li , Wanpeng Zhang , Tianwen Zhao , Huiqiao Du

The effects of sintering temperatures on the microstructures and mechanical properties of titanium carbide particles reinforced iron matrix composites (TiC/Fe MCs) fabricated by the spark plasma sintering (SPS) process with pure element powders have been systematically investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back scattering diffractometer (EBSD), and energy dispersive spectroscopy (EDS) have been conducted for microstructural analysis. The results show that with increasing sintering temperatures, the porosity of the composites initially decreases and then increases. Simultaneously, the grain size gradually diminishes while element diffusion becomes more uniform. Upon reaching a critical sintering temperature (1120 °C), the original grain size disappears and carbides undergo decomposition and reprecipitation to reach an equilibrium state, with which optimal comprehensive properties can be achieved (porosity decreases to a minimum of 3.85%, grain size of 2.69 μm, Vickers hardness reaches 595 HV0.5, bending strength is at 662 MPa, coefficient of friction is at 0.74, and wear loss to 0.21 mg). These property enhancements have been attributed to reduced porosity in the composites, decreased grain size, and improved anchoring effect of carbides within the matrix. Additionally, the primary fracture mechanisms and wear mechanisms of TiC/Fe MCs with different process parameters have been analyzed. When the temperature is below 1080 °C, intergranular fracture predominates, whereas transgranular and ductile fractures become predominant above this threshold. When the temperature is below 1120 °C, fatigue wear, oxidation wear, and abrasive wear are predominantly observed. Conversely, when the temperature exceeds 1120 °C, oxidation wear and abrasive wear become the primary mechanisms.

我们系统地研究了烧结温度对碳化钛颗粒增强铁基复合材料(TiC/Fe MCs)微观结构和机械性能的影响。扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、电子背散射衍射仪 (EBSD) 和能量色散光谱仪 (EDS) 对微观结构进行了分析。结果表明,随着烧结温度的升高,复合材料的孔隙率先减小后增大。同时,晶粒尺寸逐渐减小,元素扩散变得更加均匀。当达到临界烧结温度(1120 °C)时,原始晶粒尺寸消失,碳化物经过分解和再沉淀达到平衡状态,从而实现最佳的综合性能(孔隙率降至最低 3.85%,晶粒尺寸为 2.69 μm,维氏硬度达到 595 HV0.5,抗弯强度为 662 MPa,摩擦系数为 0.74,磨损失效为 0.21 mg)。这些性能的提高归因于复合材料中孔隙率的降低、晶粒尺寸的减小以及碳化物在基体中锚定效果的改善。此外,还分析了不同工艺参数下 TiC/Fe MCs 的主要断裂机制和磨损机制。当温度低于 1080 ℃ 时,晶间断裂占主导地位,而当温度高于这一临界值时,跨晶断裂和韧性断裂占主导地位。当温度低于 1120 ℃ 时,主要观察到疲劳磨损、氧化磨损和磨料磨损。相反,当温度超过 1120 ℃ 时,氧化磨损和磨料磨损成为主要机理。
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引用次数: 0
A comparative study on nanoscale mechanical properties of CrMnFeCoNi high-entropy alloys fabricated by casting and additive manufacturing 通过铸造和增材制造获得的铬锰铁钴镍高熵合金纳米级力学性能对比研究
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-18 DOI: 10.1016/j.jmrt.2024.09.146
Siqi Liu , Di Wan , Shuai Guan , Yuequn Fu , Zhiliang Zhang , Jianying He

Additive manufacturing (AM) has emerged as a pioneering method for fabricating high entropy alloys (HEAs), yet a comprehensive comparison of their nanoscale mechanical properties with those produced by the conventional casting method remains unexplored. In this study, the nanoindentation was utilized to investigate the nanoscale elastic and plastic characteristics in both additive-manufactured (AM-ed) and as-casted single-phase face-centered cubic (FCC) equiatomic CrMnFeCoNi HEAs. Herein, the hardness, reduced modulus, indentation size effect (ISE), yield strength, fracture toughness, and strain rate sensitivity were comprehensively investigated. The results indicated that the hardness of AM-ed HEA was higher than the as-casted HEA, and the reduced modulus values showed no notable distinction between the two samples. The AM-ed HEA demonstrated simultaneous enhancements in yield strength and fracture toughness compared to the as-casted HEA. The as-casted HEA possessed a more distinct indentation size effect (ISE) than the AM-ed HEA. It was observed that the AM-ed HEA exhibited relatively lower strain rate sensitivity and a larger activation volume. This direct comparison of the mechanical properties and deformation mechanisms from a nanoscale view offers unique insights for optimizing and advancing AM techniques in the fabrication of HEAs.

增材制造(AM)已成为制造高熵合金(HEAs)的一种开创性方法,但其纳米级机械性能与传统铸造方法所产生的纳米级机械性能的全面比较仍有待探索。本研究利用纳米压痕法研究了添加剂制造(AM-ed)和铸造单相面心立方(FCC)等原子铬锰铁钴镍(CrMnFeCoNi)高熵合金的纳米级弹性和塑性特征。在此,对硬度、还原模量、压痕尺寸效应(ISE)、屈服强度、断裂韧性和应变速率敏感性进行了全面研究。结果表明,AM-ed HEA 的硬度高于原铸 HEA,而还原模量值在两种样品之间没有明显差别。与原样浇铸的 HEA 相比,AM-ed HEA 同时提高了屈服强度和断裂韧性。与 AM-ed HEA 相比,原样铸造的 HEA 具有更明显的压痕尺寸效应 (ISE)。据观察,AM-ed HEA 的应变速率敏感性相对较低,活化体积较大。这种从纳米尺度直接比较机械性能和变形机制的方法为优化和推进 HEA 制造中的 AM 技术提供了独特的见解。
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引用次数: 0
Review on hard particle reinforced laser cladding high-entropy alloy coatings 硬质颗粒强化激光熔覆高熵合金涂层综述
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-18 DOI: 10.1016/j.jmrt.2024.09.143
Guofu Lian , Weibo Gao , Changrong Chen , Xu Huang , Meiyan Feng

Since their advent in 2004, high-entropy alloys have allured the field of materials science and engineering. Laser cladding technology, with its advantages of a small heat-affected zone and rapid heating and cooling, has become a popular technique for preparing high-entropy alloy coatings. Traditional high-entropy alloys have the problem of strength-plasticity mismatch, which limits the further application of laser cladding high-entropy alloys in industry. As a method to solve these challenges, hard particle reinforced alloy coating technology can effectively control the comprehensive properties of high-entropy alloy coatings. This paper first explores and analyzes the five strengthening mechanisms and four main influencing factors of hard particle reinforced laser cladding alloy coatings. Then, from the perspective of introducing particle types, the research status of ceramic particles, rare earth particles and other types of hard particle reinforced laser cladding high entropy alloy coatings is introduced. Finally, the characteristics of hard particle reinforced laser cladding high-entropy alloy coatings are summarized, and future recommendations for hard particle reinforced alloy coatings technology and its application in laser cladding high-entropy alloys are proposed, which will be helpful for researchers and producers in this field.

自 2004 年问世以来,高熵合金一直吸引着材料科学与工程领域的目光。激光熔覆技术具有热影响区小、加热和冷却速度快等优点,已成为制备高熵合金涂层的热门技术。传统的高熵合金存在强度-塑性不匹配的问题,这限制了激光熔覆高熵合金在工业中的进一步应用。作为解决这些难题的一种方法,硬质颗粒强化合金涂层技术可以有效控制高熵合金涂层的综合性能。本文首先探讨和分析了硬质颗粒强化激光熔覆合金涂层的五种强化机理和四种主要影响因素。然后,从介绍颗粒类型的角度,介绍了陶瓷颗粒、稀土颗粒等类型硬颗粒强化激光熔覆高熵合金涂层的研究现状。最后,总结了硬质颗粒强化激光熔覆高熵合金涂层的特点,并对硬质颗粒强化合金涂层技术及其在激光熔覆高熵合金中的应用提出了未来的建议,希望对该领域的研究者和生产者有所帮助。
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引用次数: 0
Dissimilar joining of aluminum alloy and low-alloy carbon steel by resistance spot welding 通过电阻点焊实现铝合金和低合金碳钢的异种连接
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-18 DOI: 10.1016/j.jmrt.2024.09.133
Yong Xu , Qianwei Chen , Bingxu Wang , Feng Qiu , Baixin Dong , Hongjun Li , Zude Feng , Gary C. Barber

In this work, the resistance spot welding (RSW) process was performed to join aluminum alloy and low-alloy carbon steel plates. The macro characteristics including nugget diameters and indentation rates, microstructure and tensile-shear strength of RSW joints were investigated. The results showed that the nugget of the RSW joints comprises a ‘bowl’ shape nugget on the aluminum side and an elliptical shape nugget on the steel side. Also, the intermetallic compound (IMC) layers containing Fe4Al13 and Fe2Al5 were formed around the aluminum/steel interface with the steel side having a tongue-shape and the aluminum side having a needle-shape. According to metallurgical evaluation and temperature distribution of RSW joints analyzed by the finite element method, the nugget on the aluminum side contained the dendritic grains and equiaxed dendritic grains. The nugget on the steel side consisted of a large amount of bainite and a small amount of coarse lath martensite. The nugget diameters and the indentations rates of RSW joints increased when increasing either welding current or welding time, and decreased when increasing the electrode pressure. The maximum values of nugget diameter and indentation rate of RSW joints were 9.076 mm and 4.144% when using the welding current of 16 kA, welding time of 450 ms and electrode force of 3 kN. In tensile-shear tests, the RSW joints showed a shear-off fracture mode. When increasing the welding current, welding time or electrode force, the tensile-shear strength of RSW joints increased first, and then reached a maximum, and finally decreased. The welding current of 16 kA, the welding time of 300 ms, and the electrode pressure of 3 kN were considered as the optimal welding parameters in the present study which resulted in the maximum tensile-shear strength of 2.24 kN. In addition, the IMC layers of the RSW joints exhibited a uniform and continuous appearance with a thickness of approximately 1.9 μm, and the IMC layer in the central area was thicker than that in the edge area.

本研究采用电阻点焊(RSW)工艺连接铝合金和低合金碳钢板。研究了 RSW 接头的宏观特征(包括焊块直径和压痕率)、微观结构和拉伸剪切强度。结果表明,RSW 接头的铝侧金块呈 "碗 "形,钢侧金块呈椭圆形。此外,在铝/钢界面周围形成了含有 Fe4Al13 和 Fe2Al5 的金属间化合物(IMC)层,钢侧呈舌状,铝侧呈针状。根据有限元法分析的 RSW 接头的金相评价和温度分布,铝侧的金块包含树枝状晶粒和等轴树枝状晶粒。钢侧的金块由大量贝氏体和少量粗板条马氏体组成。RSW 接头的金块直径和压痕率随焊接电流或焊接时间的增加而增加,随电极压力的增加而减小。当焊接电流为 16 kA、焊接时间为 450 ms、电极压力为 3 kN 时,RSW 接头的金块直径和压痕率的最大值分别为 9.076 mm 和 4.144%。在拉伸剪切试验中,RSW 接头呈现剪切断裂模式。当增加焊接电流、焊接时间或电极力时,RSW 接头的拉伸剪切强度先增加,然后达到最大值,最后降低。本研究将 16 kA 的焊接电流、300 ms 的焊接时间和 3 kN 的电极压力作为最佳焊接参数,从而获得了 2.24 kN 的最大拉伸剪切强度。此外,RSW 接头的 IMC 层呈现均匀连续的外观,厚度约为 1.9 μm,中心区域的 IMC 层比边缘区域的 IMC 层厚。
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引用次数: 0
Effect of trace niobium on the microstructure and properties of full-pearlite steel used in the high-strength hypereutectoid wire rods 微量铌对高强度过共晶线材所用全珠光体钢微观结构和性能的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-18 DOI: 10.1016/j.jmrt.2024.09.145
Xiaokun Pan , Jincheng Li , Chaolei Zhang , Xinping Mao , Wenjun Wang , Shuize Wang , Guilin Wu , Junheng Gao , Honghui Wu , Haitao Zhao

The present study investigated the impact of 20–80 ppm Nb on the microstructure and properties of hypereutectoid pearlite steel. Remarkably, even trace amounts of Nb exhibited a favorable effect on the refinement of austenite grain. The addition of the Nb element resulted in a reduction of pearlite transition temperature, leading to a decrease of approximately 13% in lamellar spacing and 11% in the size of pearlite colonies. Furthermore, the dragging effect of the Nb element on the carbon atoms in hypereutectoid steel facilitated the control and refinement of network carbides. These findings offer valuable theoretical guidance for the production of ultra-high-strength wire rods. When the Nb content reached 80 ppm, it promoted the precipitation of (Ti, V)C, while simultaneously improving the morphology of square carbides. The grain refining strengthening mechanism accounted for about 70% of the overall strengthening effect observed in high carbon wire rods, with the influence of the Nb element primarily targeting grain refinement. Consequently, the incorporation of minute quantities of Nb presents a promising avenue for the development of ultra-high-strength hypereutectoid wire rods, offering significant potential for enhancing their strength properties.

本研究探讨了 20-80 ppm Nb 对超共晶珠光体钢微观结构和性能的影响。值得注意的是,即使是微量的铌元素也会对奥氏体晶粒的细化产生有利影响。铌元素的加入降低了珠光体转变温度,使片层间距减少了约 13%,珠光体菌落大小减少了 11%。此外,铌元素对超共析钢中碳原子的拖曳作用促进了网络碳化物的控制和细化。这些发现为生产超高强度线材提供了宝贵的理论指导。当 Nb 含量达到 80 ppm 时,它促进了 (Ti, V)C 的析出,同时改善了方形碳化物的形态。晶粒细化强化机制约占高碳线材整体强化效果的 70%,Nb 元素的影响主要针对晶粒细化。因此,掺入微量的铌元素为开发超高强度过共晶线材提供了一条前景广阔的途径,为提高线材的强度性能提供了巨大的潜力。
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Journal of Materials Research and Technology-Jmr&t
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