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Statistical Analyses of the Strengths of Particulate Reinforced Metal Matrix Composites(PRMMCs)Subjected to Multiple Tensile and Shear Stresses

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 39-50页

作者： Geng Chen Shengzhen Xin Lele Zhang christoph broeckmann School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National International Science and Technology Cooperation Base on Railway Vehicle Operation of Beijing Jiaotong University Beijing 100044China Chair and Institute for Materials Applications in Mechanical Engineering RWTH Aachen UniversityAachen 52062Germany

For design and application of particulate reinforced metal matrix composites(PRMMCs),it is essential to predict the material strengths and understand how do they relate to constituents and microstructural *** this end,a computational approach consists of the direct methods,homogenization,and statistical analyses is introduced in our previous *** failure of PRMMC materials are often caused by time-varied combinations of tensile and shear stresses,the established approach is extended in the present work to take into account of these *** this paper,ultimate strengths and endurance limits of an exemplary PRMMC material,WC-Co,are predicted under three independently varied tensile and shear *** order to cover the entire load space with least amount of weight factors,a new method for generating optimally distributed weight factors in an n dimensional space is *** weight factors determined by this algorithm,direct method calculations were performed on many statistically equivalent representative volume elements(SERVE)*** analyzing statistical characteristics associated with results the study suggests a simplified approach to estimate the material strength under superposed stresses without solving the difficult high dimensional shakedown problem.

关键词： Direct methods(DM) Particulate reinforce metal matrix composites(PRMMCs) Random heterogeneous materials

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Quenching Simulation of PM Coated Tools

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材料热处理学报 2004年第05B期25卷 752-757页

作者： Axel Htter Werner Theisen christoph broeckmann Chair of Materials Technology Ruhr University Bochum GermanyChair of Materials Technology Ruhr University Bochum GermanyKoppern Entwicklungs-GmbH Hattingen Germany

HIP cladding is a powder metallurgical coating technique used in the production of wear parts and tools. In many cases the composite components consist of carbide-free hot-work steel as base material and wear resistant carbide-rich PM cold-work steel as coating material. To ensure operativeness a heat treatment matched to the substrate and coating material is required. Dissimilar phase transformation behaviour and different thermal expansion coefficients of layer and substrate entail inner stresses affecting the transformation kinetics in turn. In order to get a deeper insight into these effects Finite Element simulation tools are used. On the one hand, the transient heat conduction problem of the quenching process has to be solved. Non-linear boundary conditions and phase transformation of both, substrate and layer are considered. On the other hand, the mechanical response is calculated. The overall aim of the investigation is an improvement of common heat treatment techniques used for HIP cladded wear parts.

关键词：数值模拟淬火 HIP包覆磨损工具钢

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Numerical Modelling of the Powder Metallurgical Manufacturing Chain of High Strength Sintered Gears

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 3-20页

作者： Ali Rajaei Yuanbin Deng Oliver Schenk Soheil Rooein Alexander Bezold christoph broeckmann Institute for Materials Applications in Mechanical Engineering(IWM)of RWTH Aachen University Augustinerbach 452062 AachenGermany

This paper presents a digital model for the powder metallurgical(PM)production chain of high-performance sintered gears based on an integrated computational materials engineering(ICME)*** and finite element methods(DEM and FEM)were combined to describe the macroscopic material response to the thermomechanical loads and process conditions during the entire production *** microstructural evolution during the sintering process was predicted on the meso-scale using a Monte-Carlo *** effective elastic properties were determined by a homogenization method based on modelling a representative volume element(RVE).The results were subsequently used for the FE modelling of the heat treatment *** the development of multi-scale models,it was possible obtain characteristics of the microstructural *** predicted hardness and residual stress distributions allowed the calculation of the tooth root load bearing capacity of the heat-treated sintered gears.

关键词： ICME Process chain Powder metallurgy Multiscale modelling and simulation Digital model Sintered gear

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耦合材料-结构的设计与评估方法

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机械工程学报 2021年第22期57卷 1-2页

作者：张乐乐陈耕 broeckmann christoph 常超北京交通大学机械与电子控制工程学院北京100044 北京交通大学轨道车辆运用工程国家国际科技合作基地北京100044 德国亚琛工业大学机械工程材料应用研究所亚琛52062德国太原科技大学应用理学院太原030024

材料和结构形式是影响机械结构设计的两个主要因素,随着新型复合材料、新型制造工艺以及新型结构模式的不断出现,尤其是机械结构在复杂载荷条件下可能表现出的塑性、蠕变、损伤累积、疲劳等非线性行为对于结构承载性能的影响,使得设计... 详细信息

材料和结构形式是影响机械结构设计的两个主要因素,随着新型复合材料、新型制造工艺以及新型结构模式的不断出现,尤其是机械结构在复杂载荷条件下可能表现出的塑性、蠕变、损伤累积、疲劳等非线性行为对于结构承载性能的影响,使得设计与评估方面的工程问题尤为显著。传统的材料选择与结构设计相对无关、顺序评估方法不再能完全满足现有需求,因此在结构设计中不应将材料简化为给定的性能和参数。

关键词：机械结构设计新型制造工艺损伤累积非线性行为复杂载荷设计与评估承载性能新型复合材料

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A high-throughput strategy for rapid synthesis and characterization of Ni-based superalloys

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Rare Metals 2022年第8期41卷 2693-2700页

作者： Lei Zhao Su-Ran Liu Liang Jiang Li-Xia Yang Li-Long Zhu Hui Wang Wen-Yu Zhang Zai-Wang Huang Yuan-Bin Deng christoph broeckmann Hai-Liang Huang Hai-Zhou Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Metal Materials CharacterizationCentral Iron and Steel Research InstituteBeijing100081China National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Institute for Advanced Studies in Precision Materials Yantai UniversityYantai264005China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China Institute for Materials Applications in Mechanical Engineering RWTH Aachen UniversityAachen52062Germany

This study developed a new high-throughput strategy,designated as hot-isostatic-pres sing-based microsynthesis approach(HIP-MSA),to optimize high-performance nickel-based superalloys in a rapid,efficient,and cost-effective manner.A specific honeycomb-array structure containing 106 discrete cells was designed and optimized using finite element analysis(FEA)and then applied to create a combinatorial library consisting of 106 Ni-based superalloys with various Co,Nb and Ta *** integration with high-throughput characterization tools,extensive composition and phase structure data were collected quickly and *** the superalloys with higher amounts of Nb and Ta,the detrimentalηphase displaying needle-like morphology was observed,and its content(wt%)increased drastically with Ta and Nb contents ***,the increase of Co addition in those alloys was confirmed to be surprisingly beneficial by significantly suppressing the formation ofηphase that was induced by high Nb and Ta *** zero-phasefraction(ZPF)line ofηphase was established,which is critical to design superalloy chemistry for superior micros tructural stability at high-temperature service conditions.

关键词： Bulk combinatorial synthesis Honeycombarray structure Finite element analysis(FEA) Superalloy Zero-phase-fraction(ZPF)line

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