IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206468

Jinbo Liu , Zhigang Dong , Yan Bao , Renke Kang , Yintian Xing , Sen Yin

Tungsten alloys have two-phase structure, high heterogeneity and hard and brittle characteristics, and the combination of single crystal diamond (SCD) tool and ultrasonic elliptical vibration cutting (UEVC) has become critical for UPM of tungsten alloys. However, SCD tool costs and severe UEVC speed limitations constrain mass production. Therefore, UEVC with polycrystalline diamond (PCD) tools was proposed for efficient precision machining. UEVC experiments establish distinct wear mechanisms: PCD tools exhibit gradual wear through grain detachment, yielding a characteristic “honeycomb” morphology, whereas SCD tools undergo abrupt failure via edge chipping. Critically, PCD tools demonstrate superior cutting performance stability at elevated cutting speeds. Furthermore, while the surface roughness values are comparable (PCD: Sa≈65 nm, SCD: Sa≈26 nm), the evolution mechanism of surface morphology and subsurface microstructure differ significantly: PCD tools generate a 1.5 μm thick subsurface layer characterized by fine grains and extensive dislocation entanglements, forming a fine-grain reinforced zone. Conversely, SCD tools generate a fragmented-grain zone of similar thickness but containing localized banded dislocations. The refined microstructure induced by PCD tools is potentially more advantageous for enhancing the irradiation resistance of tungsten alloys. This work validates the feasibility of substituting PCD for SCD tools in UEVC of tungsten alloys, which approach offers a promising route towards the high-efficiency, low-cost and UPM for tungsten alloy components, significantly advancing the potential for industrial adoption of UEVC technology.

钨合金具有两相组织、高非均质性和硬脆特性，单晶金刚石刀具与超声椭圆振动切削（UEVC）相结合已成为钨合金UPM加工的关键。然而，SCD工具的成本和严重的UEVC速度限制限制了大规模生产。为此，提出了利用聚晶金刚石（PCD）刀具进行UEVC的高效精密加工。UEVC实验建立了不同的磨损机制：PCD工具通过颗粒脱落逐渐磨损，产生典型的“蜂窝”形态，而SCD工具则通过边缘切屑突然失效。关键是，PCD刀具在高切削速度下表现出卓越的切削性能稳定性。此外，虽然表面粗糙度值相当（PCD: Sa≈65 nm, SCD: Sa≈26 nm），但表面形貌和亚表面微观结构的演化机制存在显著差异：PCD工具产生1.5 μm厚的亚表层，其特征是细晶粒和广泛的位错纠缠，形成细晶粒增强区。相反，SCD工具产生的颗粒破碎区厚度相似，但包含局部带状位错。PCD刀具诱导的精细组织更有利于提高钨合金的耐辐照性。本研究验证了在钨合金UEVC中用PCD代替SCD工具的可行性，为实现钨合金组件的高效、低成本和UPM提供了一条有前途的途径，显著提高了UEVC技术的工业应用潜力。

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引用次数: 0

Fretting wear and fatigue behavior evaluation of aluminum alloy–steel connections fasten by type II ring groove rivet under tension loading 张拉载荷下II型环槽铆钉紧固铝合金钢连接的微动磨损及疲劳性能评价

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206472

Dongfang Zeng , Yongjie Su , Yan Xu , Zhisheng Liu , Tian Xu , Chaotao Liu , Liantao Lu

This study investigates the fretting wear and fatigue behavior of aluminum alloy–steel connections fastened using type II ring groove rivets under tension loading. It includes fatigue testing, fretting wear and fatigue analysis, and subsequent fatigue strength prediction. Experimental results reveal that fatigue cracks initiate at the edge of the prefabricated hole in the aluminum alloy plate, accompanied by severe fretting wear at the interface between the rivet and the aluminum alloy plate. A finite element model was developed to analyze the contact status and stress distribution within the riveted structure. The actual clamping force was determined by comparing the contact status of the clamped plates observed experimentally and in simulations. Results indicate that the clamping force significantly decreases from its initial value during the test, leading to a reduction in the fatigue strength of the riveted structure. Additionally, the fatigue crack initiation location shifts from the length to the width direction of the aluminum plate, and from a location distant from the prefabricated hole to the hole edge. As tensile stresses govern the crack initiation, the SWT criterion, when accounting for clamping force loss, accurately identifies fatigue crack initiation sites in riveted connection, with a fatigue strength prediction error of 15 %.

本文研究了II型环槽铆钉固定的铝合金-钢连接在拉伸载荷下的微动磨损和疲劳行为。它包括疲劳试验、微动磨损和疲劳分析，以及随后的疲劳强度预测。试验结果表明：铝合金板预制孔边缘处产生疲劳裂纹，铆钉与铝合金板界面处出现严重的微动磨损；建立了有限元模型，分析了铆接结构内部的接触状态和应力分布。实际夹紧力是通过对比实验和模拟观察到的夹紧板的接触状态来确定的。结果表明，在试验过程中，夹紧力较初始值明显减小，导致铆接结构的疲劳强度降低。疲劳裂纹起裂位置由铝板的长度方向向宽度方向偏移，由预制孔向孔边缘偏移。由于拉伸应力控制裂纹起裂，当考虑夹紧力损失时，SWT准则可以准确识别铆接连接的疲劳裂纹起裂位置，疲劳强度预测误差为15%。

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引用次数: 0

Effect of pearlite and proeutectoid ferrite on crack propagation in hypoeutectoid rails considering microstructural deformation 珠光体和原共析铁素体对考虑显微组织变形的亚共析钢轨裂纹扩展的影响

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206474

Honghao Wang , Wenjian Wang , Shuyue Zhang , Hudong Xue , Haohao Ding , Zhiyong Shi , Enrico Meli , Roger Lewis , Qiyue Liu , Andrea Rindi , Zhongrong Zhou

The evolution of microstructure influences rolling contact fatigue (RCF) crack propagation behavior. This study aims to investigate the effect of pearlite and proeutectoid ferrite on crack propagation in hypoeutectoid rails. The dry-wet alternation RCF tests were conducted using different hypoeutectoid rail steels to simulate crack propagation within the deformation and matrix layers. Subsequently, the relationship between microstructure characteristics (proeutectoid ferrite content (PF%) and pearlite interlamellar spacing (ILS)) and crack propagation behaviors (crack characteristics and propagation modes) was explored using statistical analysis. The results indicated that proeutectoid ferrite played a crucial role in determining crack propagation paths. Specifically, a higher PF% facilitated crack propagation at a smaller angle within the deformation layer, while also promoting more pronounced branching in the matrix layer. Crack propagation along proeutectoid ferrite exhibited a greater tendency, as evidenced by its proportion being approximately four times that of PF%. Moreover, in the deformation layer, proeutectoid ferrite was stretched into plastic flow lines that served as grain boundaries, which can suppress the upward crack propagation. The reduction of ILS would decrease the degree of deformation, crack depth, and the proportion of transgranular propagation. Within the matrix layer, the rail steels with a lower ILS exhibited a notable reduction in the proportion of transgranular propagation, causing the crack propagation along pearlite lamellae with lower energy dissipation.

微观组织的演变影响着滚动接触疲劳裂纹扩展行为。本研究旨在探讨珠光体和原共析铁素体对亚共析钢轨裂纹扩展的影响。采用不同的亚共析钢轨钢进行干湿交替RCF试验，模拟变形层和基体层内裂纹扩展。随后，利用统计分析方法探讨了微观组织特征（原共析铁素体含量（PF%）和珠光体层间间距（ILS））与裂纹扩展行为（裂纹特征和扩展模式）之间的关系。结果表明，原共析铁素体对裂纹扩展路径起决定性作用。具体而言，较高的PF%有利于裂纹在变形层内以较小的角度扩展，同时也促进了基体层中更明显的分支。裂纹沿预共析铁素体扩展的趋势更大，裂纹沿预共析铁素体扩展的比例约为PF%的4倍。在变形层中，原共析铁素体被拉伸成充当晶界的塑性流线，可以抑制裂纹向上扩展。ls的减小会降低变形程度、裂纹深度和穿晶扩展比例。在基体层内，低ILS的钢轨钢穿晶扩展比例显著降低，导致裂纹沿珠光体片扩展，能量耗散较低。

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引用次数: 0

Influence of lubrication state on the fretting wear behavior and mechanism of steel wire in the internal spiral contact of wire rope 润滑状态对钢丝绳内螺旋接触中钢丝微动磨损行为及机理的影响

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206469

Kun Huang , Xiangdong Chang , Yuxing Peng , Wei Tang , Zhou Zhou , Hao Lu , Xiuheng Zhang , Gushuo Jiang , Ran Deng

Fretting wear in mine hoisting rope is a key factor affecting its service reliability, and lubrication state plays a decisive role in this process. In this study, the fretting wear characteristics of wires under six working conditions of dry friction, oil/grease lubrication, water lubrication, oil-starved and grease-starved lubrication were systematically studied by a specialized fretting device. The results show that different lubrication states significantly affect the evolution law and steady-state value of coefficient of friction (COF). The dry friction is the highest, the full oil/grease lubrication is lower, the water lubrication is in the middle and fluctuates significantly, and the COF is close to dry friction at the end of starved lubrication. In addition, the fretting regime between wires is also closely related to the lubrication state between wires. Furthermore, sufficient oil/grease lubrication significantly reduces wear, while poor lubrication (dry friction, oil-starved, grease-starved, water) aggravates wear. The wear mechanisms of dry friction and oil/grease-deficient lubrication are mainly characterized by abrasive, surface fatigue and adhesion. Dry friction and oil/grease-deficient lubrication also involve tribochemical reaction. The wear mechanisms of water lubrication is mainly abrasive and surface fatigue. The wear mechanism of oil/grease lubrication is mainly abrasive.

矿井提升绳的微动磨损是影响其使用可靠性的关键因素，而润滑状态在此过程中起着决定性的作用。利用专用微动装置，系统研究了干摩擦、油/脂润滑、水润滑、缺油和缺脂润滑6种工况下钢丝的微动磨损特性。结果表明，不同的润滑状态对摩擦系数的演化规律和稳态值有显著影响。干摩擦最高，满油/脂润滑较低，水润滑居中且波动较大，无油润滑末COF接近干摩擦。此外，丝间的微动状态也与丝间的润滑状态密切相关。此外，充分的油/脂润滑可显著减少磨损，而润滑不良（干摩擦、缺油、缺脂、缺水）会加剧磨损。干摩擦和无油/无脂润滑的磨损机制主要表现为磨粒性、表面疲劳和粘附性。干摩擦和无油/无脂润滑也涉及摩擦化学反应。水润滑的磨损机制主要是磨粒和表面疲劳。油/脂润滑的磨损机制主要是磨料磨损。

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引用次数: 0

Experimental study of impregnated diamond bit part 2: Effect of the bit wear state on the drilling response 浸渍金刚石钻头试验研究第二部分：钻头磨损状态对钻进响应的影响

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206466

Rui Huang, Thomas Richard, Masood Mostofi

Impregnated diamond bits are widely used in hard rock drilling due to their robust structure and self-sharpening nature. In the companion study, we showed how the depth of cut and the rock properties (Mohs hardness) control the dominant wear mechanisms and proposed a method to select operating parameters that balance productivity with bit wear. This sequel paper develops quantitative relationships between the bit wear state and the drilling response — that is, the relationship between the bit kinematics (feed rate and angular velocity) and the forces acting on the bit (axial thrust and torque). These relations yield a relation between the performance (feed rate) and the energy or power required to achieve the performance, which is essential to improve drilling efficiency. These relations provide also the framework to analyse drilling data in real time to assess the bit state of wear and identify optimum drilling parameters.

A laboratory experimental methodology was developed to (i) measure the bit wear state and (ii) construct the drilling response. Controlled drilling experiments were conducted on a high-precision rig using three sizes of impregnated diamond tools across a wide range of wear states, characterized by diamond wear flats, matrix wear flats, and average diamond protrusion. Bit wear was measured before and after each test using an optical microscope. Experiments were performed under varying operating conditions, including different rock types, drilling fluids, flow rates, and rotation speeds.

浸渍金刚石钻头因其坚固的结构和自锐性被广泛应用于硬岩钻井。在相关研究中，我们展示了切割深度和岩石性质（莫氏硬度）如何控制主要磨损机制，并提出了一种选择作业参数的方法，以平衡生产率和钻头磨损。这篇后续论文发展了钻头磨损状态与钻井响应之间的定量关系，即钻头运动学（进给速率和角速度）与作用在钻头上的力（轴向推力和扭矩）之间的关系。这些关系产生了性能（进给速率）与实现性能所需的能量或功率之间的关系，这对于提高钻井效率至关重要。这些关系还为实时分析钻井数据、评估钻头磨损状态和确定最佳钻井参数提供了框架。开发了一种实验室实验方法来(i)测量钻头磨损状态和（ii）构建钻井响应。在高精度钻井平台上，使用三种尺寸的浸渍金刚石工具进行了控制钻井实验，这些工具的磨损状态包括金刚石磨损平面、基体磨损平面和平均金刚石突出度。在每次测试前后使用光学显微镜测量钻头磨损。实验是在不同的操作条件下进行的，包括不同的岩石类型、钻井液、流速和旋转速度。

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引用次数: 0

Enhancing the wear resistance of a light-weight TiAlCrNb-based medium-entropy alloy by matrix strengthening and hard Ti3Al precipitates 通过基体强化和硬Ti3Al析出提高轻量化tialcrnb基中熵合金的耐磨性

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206470

Xia Li , Jiang Ju , Bo Xiao , Weicheng Xiao , Jixun Zhang , Jie Gan , Tzuhsiu Chou , Junhua Luan , Haibo Ke , Weihua Wang , Tao Yang

Achieving enhanced wear resistance in light-weight alloys is crucial for aerospace and automotive applications. Simultaneously strengthening the matrix and introducing hard precipitates is fundamentally required. Here, we have designed an innovative strategy to enhance the wear resistance of the light-weight TiAlCrNb-based medium-entropy alloy (MEA) through strengthened matrix and hard Ti₃Al precipitates synergistically. Compared with the TiAlCrNb, the TiAlCrNb-1.5(ZrO₂) MEA exhibits a 39 % reduction in wear volume to

{2.02 \times 10}^{‐ 2}

mm³, a 16 % reduction in the maximum wear depth to 2.0 μm, and a 39 % reduction in wear rate to

{2.02 \times 10}^{‐ 3}

mm³/(N·m), which is primarily attributed to the hardness increment of the β matrix and the formation of the hard Ti₃Al precipitates. Our quantitative analyses indicate that the hardness increment mainly comes from grain refinement strengthening, solid-solution strengthening facilitated by integrating dissolved oxygen in the β phase, and the dislocation strengthening from the substructures and unrecrystallized structures. Additionally, introducing Ti₃Al precipitates into the TiAlCrNb matrix shows a 78 % reduction in the thickness of the deformation layer. Then, it impedes the dislocation movement, which significantly improves the wear resistance of the TiAlCrNb-1.5(ZrO₂) MEA. Our research presents novel findings on the engineering of advanced wear-resistant alloys, highlighting innovative design strategies that enhance their performance and durability.

提高轻质合金的耐磨性对于航空航天和汽车应用至关重要。同时强化基体和引入硬相是基本要求。在此，我们设计了一种创新的策略，通过强化基体和硬Ti3Al相的协同作用来提高轻质tialcrnb基中熵合金（MEA）的耐磨性。与TiAlCrNb相比，TiAlCrNb-1.5(ZrO2) MEA的磨损体积减小39%至2.02×10‐2 mm3，最大磨损深度减小16%至2.0 μm，磨损速率减小39%至2.02×10‐3 mm3/(N·m)，这主要归因于β基体硬度的增加和硬Ti3Al析出相的形成。定量分析表明，硬度的增加主要来自晶粒细化强化、溶解氧融入β相促进的固溶强化以及亚组织和非再结晶组织的位错强化。此外，在TiAlCrNb基体中引入Ti3Al析出物可使变形层厚度减小78%。阻碍位错运动，显著提高了TiAlCrNb-1.5(ZrO2) MEA的耐磨性。我们的研究展示了先进耐磨合金工程的新发现，突出了提高其性能和耐久性的创新设计策略。

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引用次数: 0

Enhancing the tribological behavior of high-speed train braking interfaces and suppressing stick-slip vibration via the stacking of disc springs 通过盘式弹簧叠加提高高速列车制动界面的摩擦学性能，抑制粘滑振动

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206475

Jin Peng , Zaiyu Xiang , Jiakun Zhang , Shaohao Deng , Xiaoqin Liu

During low-speed braking of high-speed trains, the frictional interaction at the braking interface often triggers severe stick-slip instability, manifesting as friction-induced stick-slip vibration (FISSV). This generates sharp frictional noise and accelerates wear, causes block detachment, and compromises system stability, posing risks to operational safety. Thus, effective strategies are urgently needed to improve tribological behavior and suppress FISSV. Floating brake blocks based on disc spring structures have shown promise; however, the theoretical basis for optimizing spring number and stiffness remains insufficient. In this work, a floating friction block design with stacked disc springs is proposed to enhance tribological performance and vibration suppression. Comparative experiments were performed on a multifunctional friction test rig, evaluating a fixed connection and three disc spring configurations (2, 4, and 6 springs). Surface morphology characterization and finite element simulations were conducted to further reveal suppression mechanisms. Results show that floating structures consistently outperform fixed ones, yet suppression exhibits a nonlinear dependence on spring number. Among the tested configurations, the four-spring (SPR4) design delivered the most favorable performance: displacement, acceleration, and noise RMS values decreased by 35.68 %, 54.37 %, and 49.14 %, respectively, while friction force RMS increased by 41.5 %. SPR2 generated unstable adhesion-slip cycles, whereas SPR6 showed noise amplification at later stages. Mechanistic analysis demonstrated that suppression is achieved through a cooperative “moderate - compliance - hysteresis - uniform - redistribution” effect, with SPR4 forming stable contact plateaus and uniform stress distribution. These findings identify medium-stiffness floating structures as the optimal solution, offering theoretical and engineering guidance for the design of high-speed train brake pads.

在高速列车低速制动过程中，制动界面处的摩擦相互作用往往会引发严重的粘滑失稳，表现为摩擦诱发的粘滑振动（FISSV）。这会产生剧烈的摩擦噪声，加速磨损，导致滑块脱落，影响系统稳定性，给操作安全带来风险。因此，迫切需要有效的策略来改善摩擦学行为并抑制FISSV。基于盘式弹簧结构的浮动制动块已经显示出了前景；然而，优化弹簧数量和刚度的理论依据仍然不足。为了提高摩擦块的摩擦学性能和抑制振动，提出了一种带有叠放盘式弹簧的浮动摩擦块设计。在多功能摩擦试验台上进行了对比实验，评估了固定连接和三种碟形弹簧配置（2、4和6个弹簧）。表面形貌表征和有限元模拟进一步揭示了抑制机制。结果表明，浮动结构始终优于固定结构，但抑制表现出非线性依赖于弹簧数。在测试配置中，四弹簧（SPR4）设计的性能最优：位移、加速度和噪声的均方根值分别下降了35.68%、54.37%和49.14%，而摩擦力的均方根值增加了41.5%。SPR2产生了不稳定的黏附-滑移循环，而SPR6在后期表现出噪声放大。机理分析表明，抑制是通过“适度-顺性-滞后-均匀-再分布”的协同效应实现的，SPR4形成稳定的接触高原和均匀的应力分布。研究结果确定了中等刚度浮动结构为最佳方案，为高速列车刹车片的设计提供了理论和工程指导。

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引用次数: 0

Effects of Al-Si coating quantity on the wear behavior of 22MnB5 steel in hot stamping Al-Si涂层量对22MnB5钢热冲压磨损性能的影响

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206471

Hee Geon Lee , Min-Ki Ji , Hyun-Hak Kang , Hyun-sung Son , Tea-Sung Jun

This study investigates the wear behavior of Al-Si-coated 22MnB5 steel, with respect to coating quantity, during a simulated hot-stamping process. A strip-drawing tribometer was used to replicate the process. Specimens were prepared with three distinct coating quantities (AS40, AS80, and AS140) and were subjected to an identical heat treatment at 900 °C for 5 min. Under the specific contact pressure and sliding velocity conditions tested in this study, tribological tests revealed that specimens with higher coating quantities exhibited lower friction coefficients and increased tool weight. In contrast, specimens with lower coating quantities exhibited the opposite trend. The level of oxidation varied inversely with coating quantity, with lower coating quantities promoting greater iron oxide formation. As the coating quantity increased, the amount of residual aluminum (Al) available for alloying also increased. This variation in residual Al was a critical factor that dictated the reaction pathways of the diffused iron (Fe), which either formed intermetallic compounds or oxides. Our findings demonstrate that variations in the Al-Si coating quantity, followed by heat treatment, significantly influence the friction behavior, tool wear, Fe reaction pathways, and oxidation characteristics during the hot-stamping process.

本文研究了al - si涂层22MnB5钢在模拟热冲压过程中的磨损行为，以及涂层量。用拉丝摩擦计复制了这一过程。用三种不同的涂层量（AS40、AS80和AS140）制备样品，并在900°C下进行相同的热处理5分钟。在本研究测试的比接触压力和滑动速度条件下，摩擦学测试表明，涂层量越大，试样的摩擦系数越低，刀具重量越大。相比之下，较低涂层量的试样表现出相反的趋势。氧化水平与涂敷量成反比，涂敷量越低，氧化铁生成越多。随着涂层量的增加，可合金化的残余铝（Al）量也增加。残余Al的这种变化是决定扩散铁（Fe）反应途径的关键因素，Fe要么形成金属间化合物，要么形成氧化物。我们的研究结果表明，Al-Si涂层量的变化以及热处理对热冲压过程中的摩擦行为、刀具磨损、铁反应路径和氧化特性有显著影响。

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引用次数: 0

Experimental study of impregnated diamond bit, Part 1: Bit wear 浸渍金刚石钻头的试验研究，第一部分：钻头磨损

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-13 DOI: 10.1016/j.wear.2025.206467

Rui Huang, Thomas Richard, Masood Mostofi

Impregnated diamond bits are designed with segments containing multiple layers of embedded diamonds. As the outermost layer of diamonds wears out, the next layer of sharp diamonds is exposed, sustaining performance in drilling hard and abrasive formations. Although allowing diamonds to wear fully before renewal may seem optimal for bit life, industry practices often prioritize maintaining sharp diamonds. This raises a key question: which approach delivers greater efficiency? Answering this question requires a clear understanding of bit wear mechanisms, the variables governing their occurrence, and associated wear rates. Previous studies have described different wear mechanisms, but most have been qualitative and lacked methods to quantify the bit wear state and wear rate. This research addresses these gaps by: (i) developing a systematic experimental methodology to track bit wear while drilling, and (ii) conducting a comprehensive study to identify dominant wear mechanisms and quantify wear rates under various drilling conditions.

With the proposed methodology, bit wear was investigated across seven rock types, five depths of cut (thickness of rock removed per bit revolution), and three angular velocities. The results led to the development of a conceptual wear model governed by depth of cut, identifying three distinct wear regimes and two critical depths of cut. Wear rates for each regime were quantified for rock types studied. The model provides a practical framework to select the optimum depth of cut based on rock properties. A sequel to this paper will explore the relationship between bit wear state and drilling response, which is defined as the relation between depth of cut and forces (axial thrust and torque) acting on the bit.

浸渍金刚石钻头设计成含有多层嵌钻的分段。随着最外层钻石的磨损，下一层锋利的钻石暴露出来，在坚硬和磨蚀性地层中保持性能。虽然在更新之前让钻石完全磨损似乎是钻头寿命的最佳选择，但行业惯例通常优先考虑保持锋利的钻石。这就提出了一个关键问题：哪种方法效率更高？回答这个问题需要清楚地了解钻头磨损机制、控制其发生的变量以及相关的磨损率。之前的研究描述了不同的磨损机制，但大多数都是定性的，缺乏量化钻头磨损状态和磨损率的方法。本研究通过以下方法解决了这些问题：(i)开发了一种系统的实验方法来跟踪钻井过程中的钻头磨损，（ii）进行了全面的研究，以确定主要磨损机制并量化各种钻井条件下的磨损率。采用所提出的方法，研究了7种岩石类型、5种切削深度（每钻头旋转所去除的岩石厚度）和3种角速度下的钻头磨损情况。结果导致了由切削深度控制的概念磨损模型的发展，确定了三种不同的磨损状态和两个临界切削深度。根据所研究的岩石类型，对每种状态下的磨损率进行了量化。该模型为根据岩石性质选择最佳切割深度提供了一个实用的框架。本文的后续将探讨钻头磨损状态与钻井响应之间的关系，钻井响应被定义为切削深度与作用在钻头上的力（轴向推力和扭矩）之间的关系。

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引用次数: 0

Amorphous CaSO4 nanocrystal deposits for friction and wear reduction at silicon interfaces 非晶CaSO4纳米晶沉积在硅界面的摩擦和磨损减少

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-12-12 DOI: 10.1016/j.wear.2025.206457

Tijn Vernooij , H. Tunç Çiftçi , Noushine Shahidzadeh , Bart Weber

When an object is placed on a surface, friction and wear cause uncertainty in its exact position, and thus challenge precision manufacturing. Here, we explore the development of a sacrificial nanocrystal deposit that can suppress friction and wear. Amorphous CaSO₄ nanocrystals are deposited through salt solution droplet deposition followed by evaporation. During droplet drying, a precursor film of the aqueous CaSO₄ solution spreads onto a hydrophilic silicon wafer, thus nucleating evenly spread unfaceted amorphous nanocrystals of CaSO₄ on the wafer surface. We used atomic force microscopy to study the extent, topography, and friction and wear behavior of the deposited nanocrystals. We find that the sacrificial layer of nanocrystals is easy to apply and remove, spreads over large (few cm) areas with a constant thickness of about 8 nm, and has favorable friction and wear behavior.

当一个物体被放置在表面上时，摩擦和磨损会导致其精确位置的不确定性，从而给精密制造带来挑战。在这里，我们探索了一种可以抑制摩擦和磨损的牺牲纳米晶体沉积的发展。采用盐溶液液滴沉积-蒸发法制备无定形CaSO4纳米晶。在液滴干燥过程中，含水CaSO4溶液的前驱体膜扩散到亲水硅片上，从而在硅片表面形成均匀分布的无面无定形CaSO4纳米晶体。我们使用原子力显微镜研究了沉积纳米晶体的范围、形貌和摩擦磨损行为。我们发现纳米晶体牺牲层易于涂抹和去除，分布在大（几厘米）的区域，厚度约为8 nm，并且具有良好的摩擦和磨损性能。

引用次数: 0

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