EngRN: Metals & Alloys (Topic)最新文献_第5页

Enhanced Fatigue Characteristics of Topologically Optimized Biomedical Titanium Porous Structure by Selective Laser Melting 拓扑优化医用钛多孔结构的选择性激光熔化增强疲劳特性

EngRN: Metals & Alloys (Topic) Pub Date : 2019-03-23 DOI: 10.2139/ssrn.3358886

Y.J. Liu, D. Ren, S. Li, H. Wang, L.C. Zhang, T. Sercombe

{"title":"Enhanced Fatigue Characteristics of Topologically Optimized Biomedical Titanium Porous Structure by Selective Laser Melting","authors":"Y.J. Liu, D. Ren, S. Li, H. Wang, L.C. Zhang, T. Sercombe","doi":"10.2139/ssrn.3358886","DOIUrl":"https://doi.org/10.2139/ssrn.3358886","url":null,"abstract":"Fatigue property is a critical consideration in the porous structures and most existing porous samples have unsatisfactory performance due to lack of structural optimization. This work finds that a topologically optimized structure of α-type commercial-purity titanium (CP-Ti) produced by selective laser melting presents excellent fatigue properties with an ultra-high normalized fatigue life of ~0.65 at 10<sup>6</sup> cycles at a low density of 1.3 g/cm<sup>3</sup>. All factors affecting fatigue have been studied, including material microstructure and porous structure stress analysis. The topologically optimized structure can effectively increase the fatigue life by reducing stress concentrations. The cyclic ratcheting effect plays a dominant role in fatigue crack initiation for the topologically optimized structure. As a results of twinning occurred during the fatigue process, the porous CP-Ti sample exhibits a higher ductility than the Ti-6Al-4V sample with the same structure, which delayed the fatigue crack initiation and therefore produced a higher fatigue life. In addition, the fatigue crack propagation rate was reduced significantly because of the large plastic zone ahead of the fatigue crack tip and the effect of fatigue crack deflection and bifurcation.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132456772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Sn and In on the Natural Ageing Kinetics of Al-Mg-Si Alloys Sn和In对Al-Mg-Si合金自然时效动力学的影响

EngRN: Metals & Alloys (Topic) Pub Date : 2019-01-10 DOI: 10.2139/ssrn.3313261

Meng Liu, Xingpu Zhang, Benedikt Körner, Z. Liang, David Leyvraz, J. Banhart

引用次数: 1

Doping Effects of Point Defects in Shape Memory Alloys 形状记忆合金中点缺陷的掺杂效应

EngRN: Metals & Alloys (Topic) Pub Date : 2018-12-12 DOI: 10.2139/ssrn.3300054

Yuanchao Yang, D. Xue, Ruihao Yuan, Yumei Zhou, T. Lookman, Xiangdong Ding, X. Ren, Jun Sun

{"title":"Doping Effects of Point Defects in Shape Memory Alloys","authors":"Yuanchao Yang, D. Xue, Ruihao Yuan, Yumei Zhou, T. Lookman, Xiangdong Ding, X. Ren, Jun Sun","doi":"10.2139/ssrn.3300054","DOIUrl":"https://doi.org/10.2139/ssrn.3300054","url":null,"abstract":"Abstract Doping point defects into shape memory alloys (SMAs) influences their transformation behavior and mechanical properties. We propose a general Landau free energy model to study doping effects, which only assume that point defects produce local dilatational stresses coupled to the non-order parameter volumetric strain. Different dopants can be represented by their range of interaction and potency of dilatational stress. Time-dependent simulations based on our model successfully reproduce experimentally observed doping effects in SMAs, including the elevation or suppression of the transformation temperature, the modification of mechanical properties, the appearance of a cross-hatched tweed structure and the emergence of a frozen glassy state with local strain order. We predict that the temperature range for superelasticity will be enhanced in the crossover regime between martensite and strain glass. In addition, an Elinvar effect appears most likely in alloys with dopants tending to increase the transformation temperature, which needs to be verified experimentally. Moreover, the two dopant parameters in the Landau model, the interaction range and potency of the dilatational stress, inspire us to identify three material descriptors with which we can construct an empirical machine learning model. The model predicts the transformation temperature, and the slope of the change in transformation temperature as a function of doping composition, enabling an effective search for doped SMAs with targeted properties via machine learning.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130217591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Effects of Dopants on the Glass Forming Ability in Al-Based Metallic Alloy 掺杂剂对铝基金属合金玻璃化形成能力的影响

EngRN: Metals & Alloys (Topic) Pub Date : 2018-11-07 DOI: 10.1103/PhysRevMaterials.3.023404

Yang Sun, Ph.D., Feng Zhang, Lin Yang, Huajing Song, M. Mendelev, Caizhuang Wang, K. Ho

引用次数: 9

A Comparative Study of MO Films Deposited on AISI 310 and Alumina Surface Using Anodic Vacuum Arc 用阳极真空电弧在aisi310和氧化铝表面沉积MO膜的比较研究

EngRN: Metals & Alloys (Topic) Pub Date : 2018-06-14 DOI: 10.2139/ssrn.3198526

S. Choudhury, Sanjay Kumar Sinha

引用次数: 1

Investigation of Structural Cast Iron Hardness for Castings of Automobile Industry on the Basis of Construction and Analysis of Regression Equation in the Factor Space «carbon (C) – Carbon Equivalent (C eq)» 基于因子空间“碳(C) -碳当量(C eq)”回归方程的构建与分析的汽车铸件结构铸铁硬度研究

EngRN: Metals & Alloys (Topic) Pub Date : 2018-01-23 DOI: 10.15587/2312-8372.2018.109097

D. Demin

{"title":"Investigation of Structural Cast Iron Hardness for Castings of Automobile Industry on the Basis of Construction and Analysis of Regression Equation in the Factor Space «carbon (C) – Carbon Equivalent (C eq)»","authors":"D. Demin","doi":"10.15587/2312-8372.2018.109097","DOIUrl":"https://doi.org/10.15587/2312-8372.2018.109097","url":null,"abstract":"The object of research is structural iron with lamellar graphite, in which the carbon equivalent (Ceq) is in the range (4.2–4.4) %, and the carbon content (C) in the range (3.42–3.57) %. The aim of research is description of the distribution of the hardness value of structural cast iron of serial meltings in the C–Ceq factor space at fixed values of the Cr–Ni–Cu–Ti alloy content in narrow intervals. It is shown that a polynomial regression equation of the form HB=HB(C, Ceq) can be used to obtain a workable analytical description. It is shown that such structure of the equation and those obtained by the method of least squares corresponding coefficient estimates provide 92 % accuracy of the forecast even with a small sample of data.On the basis of the canonical transformation of the response surface and its ridge analysis, it is established that it is possible in principle to satisfy different requirements for hardness. So, if the range of the planning area C=(3.42–3.57) % and Ceq=(4.2–4.4) % is chosen as the imposed constraint, then several suboptimal solutions are possible. This is the case if the task of minimizing hardness is not set and the range HB=180–250 satisfies the quality requirements specified by the production conditions. If the priority is hardness minimization, then the suboptimal solution is one and it is like the point of intersection of the constraint line (r=1.414) and the lower ridge line y=y(r). On the basis of this, it is concluded that the suboptimal solutions are multivariant, depending on the requirements of production. A nomogram has been constructed, which makes it possible to select in a rational way the technological regimes of out-of-furnace treatment in the part concerning the adjustment of the chemical composition of the alloy.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131047682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Property Optimization of Impeller Casting Using GRA 利用GRA优化叶轮铸件性能

EngRN: Metals & Alloys (Topic) Pub Date : 2017-12-21 DOI: 10.2139/ssrn.3101589

B. Kabnure, Prof. V. D. Shinde, R. Kolhapure

{"title":"Property Optimization of Impeller Casting Using GRA","authors":"B. Kabnure, Prof. V. D. Shinde, R. Kolhapure","doi":"10.2139/ssrn.3101589","DOIUrl":"https://doi.org/10.2139/ssrn.3101589","url":null,"abstract":"Ductile irons are important engineering materials because of its high strength to weight ratio and castability. The ductile iron castings are used widely for automobile applications due to its wide spectrum of property range. Weight reduction is important in automobile to improve its fuel efficiency which can be achieved by thinning down the casting sections without altering its functionality. Generally automobile castings are having varying section thickness. Varying thickness castings offers different cooling rates while solidification of the casting. The solidification cooling rate decides the final microstructure in cast components. Cooling rate was found to be affect directly the amount of pearlite and ultimately as cast properties in varying thickness ductile iron castings. In view of this, the automobile impeller casting is selected as it consists of varying section thickness in which small sections are connected to central hub. The casting solidification simulations were performed and analyzed. The solidification cooling rates were analyzed further to correlate the experimental processing parameters. The samples from poured castings were analyzed for microstructure and hardness at different section thickness. Multiple response optimization of microstructure and hardness is carried out by combined taguchi and Grey Relational Analysis (GRA). Contribution of input variables on the output variables is attained using ANOVA.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131463722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle Tracing for Metal Transfer in Hybrid TIG MAG Arc Welding Process of Interacting Heat Sources 相互热源TIG - MAG复合弧焊中金属转移的粒子示踪

EngRN: Metals & Alloys (Topic) Pub Date : 2017-12-21 DOI: 10.2139/ssrn.3101593

Onkar S. Sahasrabudhe, D. Raut, Dattaji K. Shinde

{"title":"Particle Tracing for Metal Transfer in Hybrid TIG MAG Arc Welding Process of Interacting Heat Sources","authors":"Onkar S. Sahasrabudhe, D. Raut, Dattaji K. Shinde","doi":"10.2139/ssrn.3101593","DOIUrl":"https://doi.org/10.2139/ssrn.3101593","url":null,"abstract":"Hybridization implies combination of two conventional technologies for the more improved process outcome. Constituents of the participating processes are supposed to interact in a synergistic manner to support the cause. Hybrid TIG-MAG arc welding on the similar lines is based on the synergy in heat source interactions i.e. of the two participating electric arcs. The synergy if achieved enhances the mode of metal transfer the metal joining with higher deposition rates by hybridization. This study is an attempt to investigate the arc synergies by mathematically modelling their interaction for the metal transfer in Hybrid TIG-MAG arc welding by tracing the path of the charged particle in a fluid flow. The study elaborates the devised hybridization technology with the introduction of an indigenous welding fixture. The study also presents a designed experiment for optimizing the arc current balance for maintaining the synergy in arc interactions in terms of the achieved depth of weld penetration. High speed imaging evidences have been collected which vindicate the experimental findings and as well express congruence with the process modelling.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114482787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Processability of Bulk Metallic Glasses 大块金属玻璃的加工性

EngRN: Metals & Alloys (Topic) Pub Date : 2017-02-15 DOI: 10.3844/AJASSP.2017.294.301

R. Aversa, Daniela Parcesepe, R. Petrescu, F. Berto, Guanying Chen, F. Petrescu, F. Tamburrino, A. Apicella

引用次数: 43

Casting and Casting Processes 铸造及铸造工艺

EngRN: Metals & Alloys (Topic) Pub Date : 2015-03-10 DOI: 10.2139/ssrn.2776565

D. Mahto

{"title":"Casting and Casting Processes","authors":"D. Mahto","doi":"10.2139/ssrn.2776565","DOIUrl":"https://doi.org/10.2139/ssrn.2776565","url":null,"abstract":"The casting process was discovered probably around 3500 BC in Mesopotamia. Casting is unique manufacturing processes for a variety of reasons. Perhaps the most obvious is the array of molding and casting processes available that are capable of producing complex components in any metal, ranging in weight from less than an ounce to single parts weighing several hundred tons. Foundry processes are available and in use that are economically viable for producing a single prototype part, while others achieve their economies in creating millions of the same part. Virtually any metal that can be melted can and is being cast. Many parts and components are made by casting, including automotive components such as carburettors, engine blocks, crankshafts, agricultural and rail road equipments, pipe and pumping fixtures, power tools, gun barrels and large components of hydraulic turbines etc. \u0000Since 1950, partially automated casting processes have been developed for production lines.It is estimated that castings are used in 90% or more of all manufactured goods and in all capital goods machinery used in manufacturing. The diversity in the end use of metal castings is a direct result of the many functional advantages and economic benefits that castings offer compared to other metal forming methods. The beneficial characteristics of a cast component are directly attributable to the inherent versatility of the casting process.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"918 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116181244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2