Revue De Metallurgie-cahiers D Informations Techniques最新文献_第5页

Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life 焊接工艺对S460MC细晶钢接头疲劳寿命变化的影响

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3501

J. Moravec, Jan Novák, J. Sobotka, I. Nováková

引用次数: 0

THERMAL CHARACTERISTICS AND ELECTRICAL PROPERTIES OF HOT DEFORMED AA7075 ALLOYS WITH AND WITHOUT Sc, Zr ADDITIONS 添加或不添加Sc、Zr的热变形AA7075合金的热特性和电性能

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3601

V. Kodetová, M. Vlach, M. Leibner, H. Kudrnová, P. Harcuba, L. Bajtošová, M. Cieslar

{"title":"THERMAL CHARACTERISTICS AND ELECTRICAL PROPERTIES OF HOT DEFORMED AA7075 ALLOYS WITH AND WITHOUT Sc, Zr ADDITIONS","authors":"V. Kodetová, M. Vlach, M. Leibner, H. Kudrnová, P. Harcuba, L. Bajtošová, M. Cieslar","doi":"10.37904/metal.2020.3601","DOIUrl":"https://doi.org/10.37904/metal.2020.3601","url":null,"abstract":"In the present work AA7075 alloys with and without Sc, Zr addition after hot deformation were studied. Thermal responses of precipitation reactions of hot deformed alloys were studied by differential scanning calorimetry, the relative electrical resistivity changes were determined by DC four-point method. The interconnections of these two materials characteristics were presented. Thermal and electrical measurements were compared to microstructure development that was observed by scanning and transmission electron microscope. Two types of eutectic phase were proved at (sub)grain boundaries. In the AA7075-Sc,Zr alloy primary multilayer Al3(Sc,Zr) particles precipitated during casting and subsequent cooling. In the thermal curves one exothermic process at ~ 200 °C and the decrease of relative resistivity changes were observed. Apparent activation energy of this process was calculated using by Kissinger method as ~ 100 kJ/mol regardless Sc, Zr addition. Schematic timetemperature-transformation diagram of the exothermic process was done on the base of calorimetric measurements at different heating rates.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79568092","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

Sustainability Development Goals Preferences in Metallurgical and Mining Industry 冶金和矿业的可持续发展目标偏好

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3643

R. Lenort, F. Zapletal, P. Wicher, N. Shmeleva

引用次数: 4

THE application of the OEE method for THE assessment OF BLAST FURNACE EFFECTIVENESS OEE法在高炉效能评价中的应用

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3653

E. Kardas

引用次数: 2

newly developed Al-Si based alloy for high temperature processes in automotive 新开发的汽车用高温铝硅基合金

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3582

J. Cais, Klara Caisova

引用次数: 0

THERMAL ANNEALING OF WWER – 440 NUCLEAR REACTOR PRESSURE VESSEL INTERNALS MATERIAL wwer - 440型核反应堆压力容器内部材料的热退火

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3497

Ivana Schnablová, R. Kopřiva, Ondřej Buršík, K. Rusňáková, A. Materna

{"title":"THERMAL ANNEALING OF WWER – 440 NUCLEAR REACTOR PRESSURE VESSEL INTERNALS MATERIAL","authors":"Ivana Schnablová, R. Kopřiva, Ondřej Buršík, K. Rusňáková, A. Materna","doi":"10.37904/metal.2020.3497","DOIUrl":"https://doi.org/10.37904/metal.2020.3497","url":null,"abstract":"Current trend of long-term operation of NPP’s for more than 60 years requires assurance of its safety and reliability. One of the solutions how to extend service life of reactor pressure vessel (RPV) is thermal annealing, which became a verified technology and its application in nuclear industry was prompted mainly due to an inability of RPV exchange. At present time, there is no comparable method for RPV internals that are not monitored by surveillance program and their material is exposed to significantly more intense neutron flux than the RPV. Paper presents the thermal annealing as one of the possible solutions to provide and re-establish sufficient mechanical properties of RPV internals during the operation. According to previously obtained results of unirradiated material, two thermal annealing regimes for irradiated experimental material were selected based on the annealing temperatures of 550 and 600 °C. The possibility of recovery of mechanical properties to the level almost corresponding to the initial state by the thermal annealing was studied by hardness testing and static fracture toughness tests before and after the thermal annealing of irradiated material.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85852433","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

Effect of the weir structure in the tundish on the cleanliness of IF steels and elimination of spot-like defects in deep drawing automobile steel sheets 中间包堰组织对中频钢洁净度及汽车钢板深拉深缺陷消除的影响

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020061

Xiaoxuan Deng, Guoliang Liu, Qiangqiang Wang, Baisong Liu, C. Ji, Haibo Li, Xiao-jing Shao, Guo-sen Zhu

{"title":"Effect of the weir structure in the tundish on the cleanliness of IF steels and elimination of spot-like defects in deep drawing automobile steel sheets","authors":"Xiaoxuan Deng, Guoliang Liu, Qiangqiang Wang, Baisong Liu, C. Ji, Haibo Li, Xiao-jing Shao, Guo-sen Zhu","doi":"10.1051/metal/2020061","DOIUrl":"https://doi.org/10.1051/metal/2020061","url":null,"abstract":"The flow control devices (FCDs) in the tundish play an important role in steel cleanliness and removal of macro-inclusions. To eliminate the spot-like defects during deep-drawing process, the liquid steel samples were taken from tundish in three industrial IF steel heats, and the effect of weir structure in the tundish on the steel cleanliness were evaluated and compared with the aid of ASPEX with the total detection area of over 54 000 mm2 . The results showed that non-metallic inclusions over 5 µm observed in the liquid tundish samples were categorized into two types: type 1: alumina based inclusions and type 2: calcium aluminates. Compared to the tundish without weir, the number density of macro-inclusions reduces by half when furnished with weir. In addition, several large sized calcium aluminates were occasionally found without weir whereas no calcium aluminates were detected with the weir. The mechanism of the inclusion distributions with the weir was proposed based on the experimental results, which shows that the weir act as a baffle that block the large sized inclusions from moving toward the mould. After using the weir in the actual casting practice, the occurrence ratio of spot-like defects was decreased by about 25%.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84261012","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: 3

STUDY OF AUSTEMPERED DUCTILE CAST IRON ENRICHED BY PARTICULAR RATIO OF Nickel, mOLYBDENUM AND COPPER 特定富集镍、钼、铜比例的等温球墨铸铁的研究

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3444

R. Bendikiene, A. Ciuplys, R. Česnavičius, V. Grigas, A. Jutas, A. Bahdanovich, D. N. Marmysh, A. Nasan, Liudmila Shemet, S. Sherbakov

{"title":"STUDY OF AUSTEMPERED DUCTILE CAST IRON ENRICHED BY PARTICULAR RATIO OF Nickel, mOLYBDENUM AND COPPER","authors":"R. Bendikiene, A. Ciuplys, R. Česnavičius, V. Grigas, A. Jutas, A. Bahdanovich, D. N. Marmysh, A. Nasan, Liudmila Shemet, S. Sherbakov","doi":"10.37904/metal.2020.3444","DOIUrl":"https://doi.org/10.37904/metal.2020.3444","url":null,"abstract":"This research paper combines investigation of mechanical properties of austempered ductile cast iron (ADI) and comparison with standard grades of steel and cast iron. Due to the special features of both materials – catsability from cast iron, and toughness from steel, ADI attracts an attention of industry and science because of economic benefits and high performance at the different application areas. Austempered ductile iron was tested on tension where unconventional behaviour was observed: with the increase of tensile strength almost to 1600 MPa the metal became less brittle. Hardness test revealed absence of linear relation between strength and hardness, different hardness values ~ 40 HRC or ~ 55 HRC can be reached with the same tensile strength 1000 – 1200 MPa. After successful tensile tests the main direction of further studies was solving relevant practical wear and fatigue problems in rail-wheel system. The complex practical studies demonstrated that ADI is consistent with heat treated steels including the rail steels: required tensile strength of rail steel ranges from 1180 MPa to 1280 MPa when rolling surface hardness is expected to be in the range of 38 HRC – 44 HRC, whereas tensile strength of ADI was higher, up to 1400 MPa, and hardness slightly higher than of steel, 50 HRC. Herewith the workability of frictional couple cast iron/steel 20MnCr5G exceeded work performance of steel/steel system by 14 %. Specific properties emerged from successful ratio of three elements Mo, Ni, and Cu, and properly chosen austenitization schedule.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84328182","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

THE APPLICATION OF ENA FOR COMPARISON OF PROTECTIVE PERFORMANCE OF ZRP MODIFIED BY COMBINATION OF Zn DUST WITH ALUMINIUM OR CARBON TYPE FILLERS 摘要应用ENA对锌粉与铝、碳型填料复合改性ZRP的防护性能进行了比较

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3543

B. Eremiáš, L. Mindos, L. Turek

引用次数: 1

QUality CONTROL BASE ON surface roughness CHARACTERISTIC – OXIDE layer on PURE titanium 基于表面粗糙度特征的质量控制-纯钛表面氧化层

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3659

D. Klimecka-Tatar

引用次数: 2