METAL 2021 Conference Proeedings最新文献_第3页

The effect of oxygen on fatigue resistance coefficient of high-grade medium-carbon steel manufactured in electric process and desulfurized with argon-refined 氧对电法脱硫中碳钢抗疲劳系数的影响

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4163

T. Lipiński, A. Wach, D. Karpisz

引用次数: 0

Thermal coatings properties by duplex technology 双相热涂层性能研究

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4128

František Vysoudil, V. Ochodek, Jiří Bílek

引用次数: 0

Investigation of Pressing and Ejection Performance of Friction-Reducing Powder-Compaction Tool Coatings 减摩粉末压实工具涂层的压出性能研究

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4179

B. Behrens, K. Brunotte, T. Petersen, D. Bohr

{"title":"Investigation of Pressing and Ejection Performance of Friction-Reducing Powder-Compaction Tool Coatings","authors":"B. Behrens, K. Brunotte, T. Petersen, D. Bohr","doi":"10.37904/metal.2021.4179","DOIUrl":"https://doi.org/10.37904/metal.2021.4179","url":null,"abstract":"Pressing in dies followed by sintering is the most commonly used process for shaping metal powders into components. The mechanical properties (e.g. tensile and fatigue strength) of the final sintered component depend on the green-compact properties resulting from the compaction process. Apart from the powder material used, process-specific factors, such as geometry complexity, compaction pressure and lubrication strategy, have a major impact on the properties of the green compact. The lubrication strategy is also decisive for the economic efficiency of the process as it influences the service life of the tools. Friction-reducing powder-compaction tool coatings (e.g. diamond-like-carbon-based / DLC) provide the potential to positively influence the lubrication conditions during compaction and ejection, thus simultaneously improving product quality and service life. In this study, experimental investigations on the performance of friction-reducing coatings in the die pressing of steel powder (Fe + 0.6 wt% C) with and without admixed lubricant (AncorLube, GKN Hoeganaes) are presented. The results are evaluated by force-displacement measurements, which allows for a more profound analysis of compaction and ejection behaviour. It is shown that the application of the coatings reduces the ejection loads significantly when no admixed lubricant is used, and moderately when lubricant is admixed. However, without lubricant, wear still occurs after a few pressing cycles, so it cannot be completely avoided.","PeriodicalId":266696,"journal":{"name":"METAL 2021 Conference Proeedings","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124300401","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

FORMATION AND CHARACTERISATION OF CHROMATE-FREE CONVERSION LAYERS ON 5556 ALUMINUM ALLOY 5556铝合金无铬转化层的形成与表征

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4173

A. Kolesnikova, A. Abrashov, N. Grigoryan, T. Vagramyan

引用次数: 0

INFLUENCE OF THE annealing TEMPERATURE ON THE HARDNESS of the built-up edge of medium carbon steel 退火温度对中碳钢积边硬度的影响

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4143

W. Presz

{"title":"INFLUENCE OF THE annealing TEMPERATURE ON THE HARDNESS of the built-up edge of medium carbon steel","authors":"W. Presz","doi":"10.37904/metal.2021.4143","DOIUrl":"https://doi.org/10.37904/metal.2021.4143","url":null,"abstract":"In metal forming processes, in some cases, galling occurs, which results in the formation of built-up edges on the surface of the tool. They usually damage the outer layer of the workpiece. The aim of the work is to broaden the knowledge about the structure and mechanisms of the formation of the build-ups structure. In this case, it concerns the build-up produced on the NC6 steel tool in the process of drawing the steel 30 strip at an elevated temperature. At a special stand enabling the process temperature change, the temperature of the greatest tendency to galling in dry friction conditions was determined at 620 °C. As a result of the research, the annealing temperature of the built-up material was determined at 500 °C. It was noted that the build-up formed at 620 °C has a hardness more than twice as high as the same build-up annealed for 1h at approximately similar temperature, 600 °C. The difference is due to the differences in the dynamics of the processes. The process of the build-up leads to the formation of a highly deformed supercooled structure which reaches the state of equilibrium during quasi-static annealing. The energy stored in the supercooled structure of the buildup during annealing at a relatively low temperature of 400 °C activates the recovery process, reducing the hardness by 30 %. Structural investigations have shown that the resulting build-up has a streak structure, probably created in the process of shearing successive layers of material. In build-up edge, the more strengthened layers alternate between layers with a lower degree of deformation.","PeriodicalId":266696,"journal":{"name":"METAL 2021 Conference Proeedings","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125728300","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

Mechanical properties according to special alloys used to casting 根据特殊合金的机械性能来铸造

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4265

M. Hugo, Milan Luňák, J. Svobodová

引用次数: 0

EFFECT OF FIBRE INCLINATION ANGLES ON THE SUPERELASTIC BEHAVIOUR OF ANNEALED NiTi FIBRES 纤维倾角对退火镍钛纤维超弹性性能的影响

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4223

Aravi Muzaffar, R. Prasad, S. Neelakantan

{"title":"EFFECT OF FIBRE INCLINATION ANGLES ON THE SUPERELASTIC BEHAVIOUR OF ANNEALED NiTi FIBRES","authors":"Aravi Muzaffar, R. Prasad, S. Neelakantan","doi":"10.37904/metal.2021.4223","DOIUrl":"https://doi.org/10.37904/metal.2021.4223","url":null,"abstract":"Metallic networks are promising candidates for new age porous materials wherein porosity is induced by manoeuvring network architecture. Their properties are thus highly dependent on architectural parameters like fibre segment length, orientation of fibres, porosity etc., apart from being dependent on the nature of material and processing conditions. As such, varied networks having diverse properties can be constructed depending on the choice of architectural or structural parameters and fibre material. Shape memory alloys (SMAs), when used to make the network, can bring about additional properties like superelasticity and shape memory effect in network that can be beneficial for increasing the recoverable strain of SMAs. In the current study, the as-received cold worked Nitinol wire of 0.125 mm diameter has been considered. In order to achieve the required SMA properties for manifesting the characteristic behaviour of Nitinol, an annealing treatment is needed. The specimens were subjected to heat treatment at 400°C for 5, 15 and 30 minutes and evolution of transformation temperatures was measured by differential scanning calorimetry (DSC). Further, the effect of fibre orientation– a critical structural parameter of the networks – on the shape memory properties of SMAs in the porous network form has been considered. For this, SMA fibre specimens annealed at 400 °C for 30 min were inclined at different orientations and loaded in tension till fracture. It was observed that with the increase in inclination angle from the loading axis, the plateau and fracture load decreases, whereas the superelastic strain range increases. The SMA deformation characteristics were then modelled in ANSYS software to determine the effect of inclination angles and further validated.","PeriodicalId":266696,"journal":{"name":"METAL 2021 Conference Proeedings","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132077244","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

FEA analysis of thin steel sheet with different locations of reinforcing ribs created by local laser treatment 局部激光处理不同补筋位置薄钢板的有限元分析

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4153

Oleksandr Kapustynskyi

引用次数: 0

effects of heat treatment and hot isostaTic pressing on microstructure and mechanical properties of ti2alnb-based alloy fabricated by slm 热处理和热等静压对slm法制备ti2alnb基合金组织和力学性能的影响

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4239

I. Polozov, A. Popovich, V. Sufiiarov

引用次数: 1

Fatigue properties of Ti6Al4V prepared by selective laser melting 选择性激光熔化制备Ti6Al4V合金的疲劳性能

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI: 10.37904/metal.2021.4269

M. Losertová, V. Kubeš, Z. Čejka, F. Fojtík, K. Konečná, M. Kraus, T. Čegan

{"title":"Fatigue properties of Ti6Al4V prepared by selective laser melting","authors":"M. Losertová, V. Kubeš, Z. Čejka, F. Fojtík, K. Konečná, M. Kraus, T. Čegan","doi":"10.37904/metal.2021.4269","DOIUrl":"https://doi.org/10.37904/metal.2021.4269","url":null,"abstract":"The microstructure and fatigue properties of specimens prepared using the selective laser melting technology were analyzed and compared to specimens produced of Ti6Al4V alloy by a conventional way, it means by the casting and forging. The forged samples were studied in both as-received and annealed + hot isostatic pressed conditions; the selective laser melted samples were tested after annealing + hot isostatic pressing. It was proved that the forged specimens showed better fatigue properties than the selective laser melted samples, according to defects formed during the powder-bed-based additive manufacturing process. Small differences in fatigue life were observed for both heat treatment conditions of the forged samples. Despite certain porosity, the selective laser melted samples showed high endurance limit at stress level of 320 MPa. Nevertheless, the limit strength value was lower by 26% and 36% comparing forged specimens in as-received and heat treated + hot isostatic pressed conditions, respectively. The microstructure of all tested samples was formed of α+β phases depending on heat treatment condition. The differences in fatigue fracture features of the forged or selective laser melted specimens corresponded to the microstructure, defects and porosity presence.","PeriodicalId":266696,"journal":{"name":"METAL 2021 Conference Proeedings","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127819032","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