Revue De Metallurgie-cahiers D Informations Techniques最新文献_第6页

CRACKs FORMATION IN Nickel-based single crystal alloy manufactured by SELECTIVE LASER MELTING 选择性激光熔化制备镍基单晶合金裂纹的形成

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3625

E. Borisov, K. Starikov, A. Popovich, V. Popovich

引用次数: 2

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":"78 1","pages":"609"},"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

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":"26 1","pages":""},"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

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

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":"8 1","pages":""},"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

Study on the transformation and microstructure evolution during hot-charging rolling process of a weathering steel 某耐候钢热装轧制过程相变及组织演变研究

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020027

Man Liu, Guang Xu, Guanghui Chen, Zhoutou Wang

{"title":"Study on the transformation and microstructure evolution during hot-charging rolling process of a weathering steel","authors":"Man Liu, Guang Xu, Guanghui Chen, Zhoutou Wang","doi":"10.1051/metal/2020027","DOIUrl":"https://doi.org/10.1051/metal/2020027","url":null,"abstract":"The effect of hot-charging temperature (HCT) on the transformation and microstructure evolution of a weathering steel was investigated by metallography and dilatometry. The results show that the microstructure consisted of ferrite and pearlite in all specimens when the HCT was between 500 ∼ 850 °C. The difference was that pearlite amount increased obviously at 750 °C, which is detrimental to the plasticity of steels. The reason for more pearlite is that ferrite and austenite coexisted at 750 °C, which belongs to the dual-phase region temperature. The reversed transformation of ferrite to austenite happened and the pre-existing austenite became coarse during the secondary austenization. The carbon content in fine reversed austenite was relatively low, while the coarse austenite contained higher carbon content, which decomposed into blocky pearlite in the final cooling process. Therefore, to obtain the desirable ferrite phase, the HCT of about 750 °C should be avoided. The results provide theoretical reference for optimizing hot-charging rolling process parameters.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"104 1","pages":"304"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80671105","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

Enhancement of the productivity of non-recovery stamp charge coke oven plant at JSPL Raigarh 提高拉加尔JSPL非回收印花焦炉装置生产效率

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020074

Rupak Ranjan, H. P. Tiwari, P. Srivastava, M. S. Raghuwanshi, A. K. Jaiswal, M. Borkar

引用次数: 0

Evolution of microstructure, texture and inhibitor of medium temperature grain-oriented silicon steel 中温晶粒取向硅钢组织、织构及抑制剂的演变

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020050

Fan Lifeng, Xingyuan Zhao, Li-jun Xiao, Jiao Huang, Y. Zhang

{"title":"Evolution of microstructure, texture and inhibitor of medium temperature grain-oriented silicon steel","authors":"Fan Lifeng, Xingyuan Zhao, Li-jun Xiao, Jiao Huang, Y. Zhang","doi":"10.1051/metal/2020050","DOIUrl":"https://doi.org/10.1051/metal/2020050","url":null,"abstract":"The medium temperature reheating and two-stage cold rolling process were adopted to produce industrialized Grain-oriented silicon steel. Results showed there were three sections (surface layer, transition layer and central layer) along the thickness direction on hot rolled sheets. Surface layer was occupied by complete recrystallization grains with average grain size 42.81 µm, while the central layer mainly consisted of fibrous microstructure. The Goss texture appeared only on surface layer with content 3.44%∼3.65%. After the first cold rolling with 72% reduction and decarburization annealing, the primary recrystallization occurred and average grains size reached 19.0 µm, simultaneously accompanied with texture rotated to λ, γ fiber texture and Goss texture dropped to 2.89%. Adopting the second cold rolling with 58% reduction, the cold rolled sheet consisted of deformed fiber microstructure and the texture maintained γ fiber texture with a peak at {111} . The precipitates in hot rolled sheets comprised Cu2 S and few AlN, and the average particle size was ∼14 nm. The inhibitors in the decarburization annealing sheet were mainly AlN, Cu2 S, MnS and their composite precipitation, which were spherical or massive with the average particle size ∼21 nm. The single Goss oriented grains with average grain size 9.41 mm were obtained after high temperature annealing, and the intensity reached 873.30. The final magnetic properties were: B8 = 1.865 T and P1.7/50 = 1.124 W/kg, which met the requirement of 27Q120.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"57 1","pages":"510"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78859790","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

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

ON THE METAHEURISTIC OPTIMIZATION ALGORITHMS IN THE STRUGGLE FOR THE HOT FLOW CURVE APPROXIMATION ACCURACY 热流曲线近似精度斗争中的元启发式优化算法

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3466

P. Opěla, I. Schindler, S. Rusz, V. Ševčák, I. Mamuzic

引用次数: 0