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Stress-controlled fatigue of HfNbTaTiZr high-entropy alloy and associated deformation and fracture mechanisms

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Journal of Materials Science & Technology 2022年第19期114卷 191-205页

作者： Shuying Chen Weidong Li Ling Wang Tao Yuan Yang Tong Ko-Kai Tseng Jien-Wei Yeh qingang xiong Zhenggang Wu Fan Zhang Tingkun Liu Kun Li Peter KLiaw Institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Department of Industrial and Systems Engineering Ohio UniversityAthensOH 45701USA Department of Materials Science and Engineering High Entropy Materials CenterNational Tsing Hua UniversityHsinchu30013TaiwanChina State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510640China College of Materials Science and Engineering Hunan UniversityChangsha 410082China WPI Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China

The stress-controlled fatigue tests are carried out at a stress ratio of 0.1 and a frequency of 10 Hz,and span both low-cycle and high-cycle regimes by varying the applied stress amplitudes.The high-cycle fa-tigue regime gives a fatigue strength of 497 MPa and a fatigue ratio of 0.44.At equivalent conditions,the alloy’s fatigue strength is greater than all other high-entropy alloys(HEAs)with reported high-cycle fatigue data,dilute body-centered cubic alloys,and many structural alloys such as steels,titanium al-loys,and aluminum alloys.Through in-depth analyses of crack-propagation trajectories,fracture-surface morphologies and deformation plasticity by means of various microstructural analysis techniques and theoretical frameworks,the alloy’s remarkable fatigue resistance is attributed to delayed crack initiation in the high-cycle regime,which is achieved by retarding the formation of localized persistent slip bands,and its good resistance to crack propagation in the low-cycle regime,which is accomplished by intrin-sic toughening backed up by extrinsic toughening.Moreover,the stochastic nature of the fatigue data is neatly captured with a 2-parameter Weibull model.

关键词： Fatigue mechanisms Intrinsic toughening Extrinsic toughening Probabilistic modeling

Direct numerical simulation of particle-fluid systems by combining time-driven hard-sphere model and lattice Boltzmann method

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Particuology 2010年第4期8卷 379-382页

作者： Limin Wang Guofeng Zhou Xiaowei Wang qingang xiong Wei Ge State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

A coupled numerical method for the direct numerical simulation of particle-fluid systems is formulated and implemented, resolving an order of magnitude smaller than particle size. The particle motion is described by the time-driven hard-sphere model, while the hydrodynamic equations governing fluid flow are solved by the lattice Boltzmann method （LBM）, Particle-fluid coupling is realized by an immersed boundary method （IBM）, which considers the effect of boundary on surrounding fluid as a restoring force added to the governing equations of the fluid. The proposed scheme is validated in the classical flow-around-cylinder simulations, and preliminary application of this scheme to fluidization is reported, demonstrating it to be a promising computational strategy for better understanding complex behavior in particle-fluid systems.

关键词： Direct numerical simulation Immersed boundary method Lattice Boltzmann methodParticle-fluid systems Time-driven hard-sphere model

制浆造纸厂污泥热分解特性及其动力学、热力学分析

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能源环境保护 2024年第2期38卷 180-189页

作者：丁蕾陈方军任冠龙熊勤钢华南理工大学制浆造纸工程国家重点实验室广东广州510640

热解技术在制浆造纸厂污泥的无害化、资源化、减量化处置方面具有很大的应用潜力。目前对制浆造纸厂污泥在热解过程的热解行为、热动力学特性和产品组成情况了解仍不全面。采用热重红外联用(TG-FTIR)、快速热解-气质联用(Py-GC/MS)技术... 详细信息

热解技术在制浆造纸厂污泥的无害化、资源化、减量化处置方面具有很大的应用潜力。目前对制浆造纸厂污泥在热解过程的热解行为、热动力学特性和产品组成情况了解仍不全面。采用热重红外联用(TG-FTIR)、快速热解-气质联用(Py-GC/MS)技术,研究了制浆造纸厂污泥在不同加热速率下的热分解行为以及挥发性产物的释放特性,并采用多组分平行反应动力学模型、动力学补偿法以及主图法探究了有机物热解动力学。研究结果表明,制浆造纸污泥中的有机物质主要集中在温度范围为140℃至600℃之间进行热解,热解产物主要包括H_(2)O、CH_(4)、CO_(2)、CO、NH_(3)、酮、醛、羧酸、酚、芳烃、醚和醇类等物质。随着热解温度升高至600~900℃时,制浆造纸污泥中的CaCO_(3)将会分解,产生大量CO_(2),同时CO_(2)会与热解炭反应生成CO。研究采用的4组分的平行反应动力学模型可以较好地描述制浆造纸污泥中的有机物分解过程。4个假组分的平均表观活化能分别为171.54、179.50、192.05、200.86 kJ/mol;指前因子分别为1.74×10^(11)~8.34×10^(16)、1.47×10^(11)~5.55×10^(13)、1.40×10^(11)~1.55×10^(12)、1.67×10^(10)~1.34×10^(13)s^(-1)。不同组分之间遵循不同的反应机理模型,随着转化分数增加反应机理模型也会逐渐发生变化。

关键词：制浆造纸污泥热解动力学热力学热重红外

Corrigendum to“Stress-controlled fatigue of HfNbTaTiZr high-entropy alloy and associated deformation and fracture mechanisms”[Journal of Materials Science&Technology,114(2022)191-205]

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Journal of Materials Science & Technology 2022年第27期122卷 255-255页

作者： Shuying Chen Weidong Li Ling Wang Tao Yuan Yang Tong Ko-Kai Tseng Jien-Wei Yeh qingang xiong Zhenggang Wu Fan Zhang Tingkun Liu Kun Li Peter K.Liaw Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Institute for Advanced Studies in Precision Materials Yantai UniversityYantai264005China Department of Industrial and Systems Engineering Ohio UniversityAthensOH 45701USA Division of Materials Science and Technology Oak Ridge National LaboratoryOak RidgeTN 37831USA High Entropy Materials Center Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchu 30013Taiwan State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510640China College of Materials Science and Engineering Hunan UniversityChangsha 410082China WPI Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA

The authors regret.The authors would like to apologise for any inconvenience caused.

关键词： fatigue alloy deformation

Efficient parallel implementation of the lattice Boltzmann method on large clusters of graphic processing units

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Chinese Science Bulletin 2012年第7期57卷 707-715页

作者： xiong qingang LI Bo XU Ji FANG XiaoJian WANG XiaoWei WANG LiMin HE XianFeng GE Wei State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China

Many-core processors, such as graphic processing units (GPUs), are promising platforms for intrinsic parallel algorithms such as the lattice Boltzmann method (LBM). Although tremendous speedup has been obtained on a single GPU compared with mainstream CPUs, the performance of the LBM for multiple GPUs has not been studied extensively and systematically. In this article, we carry out LBM simulation on a GPU cluster with many nodes, each having multiple Fermi GPUs. Asynchronous execution with CUDA stream functions, OpenMP and non-blocking MPI communication are incorporated to improve efficiency. The algorithm is tested for two-dimensional Couette flow and the results are in good agreement with the analytical solution. For both the oneand two-dimensional decomposition of space, the algorithm performs well as most of the communication time is hidden. Direct numerical simulation of a two-dimensional gas-solid suspension containing more than one million solid particles and one billion gas lattice cells demonstrates the potential of this algorithm in large-scale engineering applications. The algorithm can be directly extended to the three-dimensional decomposition of space and other modeling methods including explicit grid-based methods.

关键词：格子Boltzmann方法图形处理单元并行算法集群 Couette流 LBM模拟 OpenMP 直接数值模拟

基于MP-PIC的鼓泡流化床内煤气化过程数值模拟

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工程热物理学报 2023年第8期44卷 2161-2166页

作者：刘晓环杨世亮熊勤钢胡建杭昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室昆明650093 华南理工大学轻工科学与工程学院广州510640

本文采用多相流体网格质点方法探讨了流化床煤气化系统中颗粒尺度行为及不同操作参数(床层温度、气化剂流率)对气化特性的影响。研究结果表明:气化系统床层底部及稠密区处传热系数较大;煤和惰性床料的传热系数轴向分布不均匀且具有不同... 详细信息

本文采用多相流体网格质点方法探讨了流化床煤气化系统中颗粒尺度行为及不同操作参数(床层温度、气化剂流率)对气化特性的影响。研究结果表明:气化系统床层底部及稠密区处传热系数较大;煤和惰性床料的传热系数轴向分布不均匀且具有不同的分布特征;随着床层温度的升高,煤和床料的传热系数均增加;提高气化炉内床层温度、空气流率、氧气流率和蒸气流率,碳转化率分别提高了16.3%、2.8%、4.1%和2.8%;与其他操作条件相比,床层温度对提高碳转化率的效果最显著。

关键词：煤气化鼓泡流化床多相流体网格质点碳转化率洁净煤技术

压力脉冲强化过滤实验及计算流体力学模拟研究

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中国造纸 2023年第9期42卷 125-135页

作者：汤超莫立焕李军熊勤钢华南理工大学制浆造纸工程国家重点实验室广东广州510640

为研究管状陶瓷膜过滤器过滤流场和压力脉冲强化过滤的机理,采用计算流体力学(CFD)模拟和实验相结合的办法,依据达西定律分析过滤器内多孔介质过滤性能,然后进行CFD模拟,分析不同工况下实验与模拟结果的差距,最后分析压力脉冲强化过滤... 详细信息

为研究管状陶瓷膜过滤器过滤流场和压力脉冲强化过滤的机理,采用计算流体力学(CFD)模拟和实验相结合的办法,依据达西定律分析过滤器内多孔介质过滤性能,然后进行CFD模拟,分析不同工况下实验与模拟结果的差距,最后分析压力脉冲强化过滤效果和机理。结果表明,部分工况的参数与实验结果相近,然而部分工况有较大差距,但总体显示规律与实验结果相同;由于旋转增加了流体径向速度,使得过滤通量增加。随着转子转速提高,多孔介质过滤流量均有不同程度提高,相较于尾水口阀门关闭的过滤方式,保持尾水口阀门一定开度的方案更有利于增加过滤通量。

关键词：膜过滤 CFD 达西定律

应用显色萃取法测定塔里木油田采出液中残余缓蚀剂的浓度

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油气田地面工程 2019年第2期38卷 12-14,21页

作者：熊新民南楠石鑫董琴刚柳楠中国石油天然气股份有限公司塔里木油田分公司中国石油化工股份有限公司中原油田分公司石油工程技术研究院

油气开采及输送过程中常伴有CO_2、H_2S等气体的腐蚀,为保证油气田安全运营,通过投加缓蚀剂来减缓腐蚀速率。随着时间的增加,投加的缓蚀剂有效质量浓度无法确定,为了建立合理的集输管线缓蚀剂加药制度,需要对采出液中缓蚀剂的残余浓度... 详细信息

油气开采及输送过程中常伴有CO_2、H_2S等气体的腐蚀,为保证油气田安全运营,通过投加缓蚀剂来减缓腐蚀速率。随着时间的增加,投加的缓蚀剂有效质量浓度无法确定,为了建立合理的集输管线缓蚀剂加药制度,需要对采出液中缓蚀剂的残余浓度进行测定。利用显色萃取法测定塔里木油田采出液中的缓蚀剂残余浓度,可以消除采出液中大量干扰离子的影响,且缓蚀剂质量浓度与吸光度成正比,线性关系较好,因此使用显色萃取法对塔里木油田采出液中的缓蚀剂残余浓度进行日常检测准确、简单、可行。

关键词：塔里木油田采出液缓蚀剂残余浓度显色萃取法