Isij International最新文献_第5页

Application of Online Automated Segmentation and Evaluation Method in Anomaly Detection at Rail Profile Based on Pattern Matching and Complex Networks 基于模式匹配和复杂网络的在线自动分割和评估方法在铁路轮廓异常检测中的应用

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-27 DOI: 10.2355/isijinternational.isijint-2024-003

Lingling Tong, Zhimin Lv, Jing Guo

{"title":"Application of Online Automated Segmentation and Evaluation Method in Anomaly Detection at Rail Profile Based on Pattern Matching and Complex Networks","authors":"Lingling Tong, Zhimin Lv, Jing Guo","doi":"10.2355/isijinternational.isijint-2024-003","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-003","url":null,"abstract":"In steel rail production, complex deformations can induce non-uniform changes in cross-sectional profiles along the rail's length, resulting in unevenness and safety implications. It is essential to perform dimensional testing to ascertain compliance with standard requirements. Currently, profile inspection results are manually evaluated, posing efficiency challenges and a lack of standardized criteria.To address this challenge, this paper proposes an online automatic steel rail segmentation and evaluation method (online-ASE) based on pattern matching and complex networks to enable automatic rail profile assessment. This method initially utilizes offline high-dimensional time series data for conducting Toeplitz Inverse Covariance-based Clustering (TICC) training and constructs a standard quality characterization pattern library through distinct inverse covariance structures between abnormal and normal high-dimensional quality characterization indicators of steel rails. When applied online, the Viterbi shortest path dynamic programming algorithm is utilized to match steel rail data with the pattern library, swiftly identifying anomalous rail segments. Additionally, the algorithm computes the contribution of steel rail quality parameters to the segmentation results using complex network betweenness centrality, thereby explaining the reasons for segment formation. These explanations provide a reference basis for subsequent steel rail repairs. Finally, the effectiveness of the proposed method is validated using real-world steel rail data from a specific steel factory in China.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance and Structural Analysis of Vanadium Composite Electrogalvanized Steel Sheets 钒复合电镀锌钢板的性能和结构分析

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-27 DOI: 10.2355/isijinternational.isijint-2024-162

Fumio Shibao, Hiromasa Shoji, Hiroaki Nakano

引用次数: 0

Chlorine-free Microwave Digestion of Stainless Steel for Inductively Coupled Plasma Mass Spectrometric Analysis 用于电感耦合等离子体质谱分析的不锈钢无氯微波消解技术

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-20 DOI: 10.2355/isijinternational.isijint-2024-050

Kenichi Nakayama

引用次数: 0

Hydrogen content dependence of the contribution of dislocation-slip stability and carbide precipitation morphology to the hydrogen embrittlement property of high-strength martensitic steels 位错滑移稳定性和碳化物析出形态对高强度马氏体钢氢脆特性贡献的氢含量依赖性

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-17 DOI: 10.2355/isijinternational.isijint-2024-156

Kei Saito, Kenichi Takai

{"title":"Hydrogen content dependence of the contribution of dislocation-slip stability and carbide precipitation morphology to the hydrogen embrittlement property of high-strength martensitic steels","authors":"Kei Saito, Kenichi Takai","doi":"10.2355/isijinternational.isijint-2024-156","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-156","url":null,"abstract":"The contribution of dislocation-slip stability and carbide precipitation morphology to the hydrogen embrittlement (HE) property of tempered martensitic steels with low and high silicon contents (L-Si and H-Si) and oil-quenched martensitic steel (As-OQ), was evaluated by conducting slow strain rate tests. The order of dislocation-slip stability was the H-Si specimen > L-Si specimen > As-OQ specimen. The H-Si and As-OQ specimens had finely dispersed carbides inside prior austenite (γ) grains, whereas the L-Si specimen had coarsely dispersed carbides inside prior γ grains and on the boundaries. Notched specimens were charged with hydrogen in a range of low (0.19-0.31 ppm), medium (1.04-1.49 ppm), and high (2.17-2.33 ppm) hydrogen contents. The H-Si specimen had the highest HE property under the three hydrogen charging conditions. With the low and medium hydrogen charging conditions, the HE property of the L-Si specimen was higher than that of the As-OQ specimen, whereas their HE properties markedly declined to a similar level under the high hydrogen charging condition. The HE property of the L-Si specimen with increased dislocation-slip stability by applying stress relaxation was equivalent to that of the L-Si specimen under the high hydrogen charging condition. These results revealed that increasing dislocation-slip stability improved the HE property in the range of low to medium hydrogen charging. Under the high hydrogen charging condition, dislocation-slip stability did not contribute to improving the HE property, but it was found that the carbide precipitation morphology, particularly coarse carbides precipitated on prior γ grain boundaries, influenced the HE property.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of precipitate phases in an 11 pct Cr ferritic and martensitic steel after thermomechanical treatment 热机械处理后 11 pct Cr 铁素体和马氏体钢中沉淀相的鉴定

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-17 DOI: 10.2355/isijinternational.isijint-2024-042

Yinzhong Shen, Yajing Guo

{"title":"Identification of precipitate phases in an 11 pct Cr ferritic and martensitic steel after thermomechanical treatment","authors":"Yinzhong Shen, Yajing Guo","doi":"10.2355/isijinternational.isijint-2024-042","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-042","url":null,"abstract":"An 11 mass% Cr ferritic/martensitic steel was subjected to a standard heat treatment consisting of normalizing and tempering and subsequently, a thermomechanical treatment (TMT) process involving austenization at 1100 °C for 1 hour, warm-rolling with 93% deformation at 650 °C and tempering at 650 °C for 1 hour. The precipitate phases of the TMT-processed steel were qualitatively analyzed using transmission electron microscopes and energy dispersive X-ray spectrometers in combination of lattice parameter calculation. Nb-rich MC carbides and Nb-rich M(C,N) carbonitrides pre-existing in the normalized-and-tempered steel were also observed in the TMT-processed steel. Eight types of precipitate phases introduced by the TMT were identified in the TMT-processed steel. They are Nd-rich MC carbide with a face-centered cubic crystal structure and lattice parameter a = 1.1408 nm, Cr-rich M2C carbides/Cr-rich M2X (Cr2C type) carbonitrides/Cr-rich M2X (Cr2N type) carbonitride with a hexagonal crystal structure, Cr-rich M7C3 carbides/Cr-rich M3C2 carbide/V-rich M2(C,N) carbonitride with a simple orthorhombic crystal structure, and Mn-rich M5C2 carbide with a base-centered monoclinic crystal structure. Among these identified precipitate phases, Nb-rich MC carbides, Nb-rich M(C,N) carbonitrides, Cr-rich M2C carbides and Cr-rich M2X (Cr2C type) carbonitrides are dominant phases, while the other six precipitate phases are minor phases, in the TMT-processed steel. The identified precipitate phases are also discussed.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-Isothermal Reduction Kinetics Model of Self-Reducing Iron Ore Pellets 自还原铁矿球团的非等温还原动力学模型

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-17 DOI: 10.2355/isijinternational.isijint-2024-107

Suporn Kittivinitchnun, Pruet Kowitwarangkul, Elsayed Mousa, Alexander Babich

{"title":"Non-Isothermal Reduction Kinetics Model of Self-Reducing Iron Ore Pellets","authors":"Suporn Kittivinitchnun, Pruet Kowitwarangkul, Elsayed Mousa, Alexander Babich","doi":"10.2355/isijinternational.isijint-2024-107","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-107","url":null,"abstract":"In this study, a non-isothermal reduction kinetics model has been developed for a single self-reducing iron ore pellet (SRP) to enhance the understanding of the reduction kinetics especially in the thermal reserve zone (TRZ) of the blast furnace (BF). The model simulates the mass changes and chemical processes during reduction, incorporating the effects of temperature, gas composition, and pellet composition on the reduction kinetics of different iron oxide phases, including Fe2O3, Fe3O4, and FeO. A mathematical model, comprising a comprehensive set of ordinary differential equations (ODEs), has been developed and solved using numerical methods and MATLAB software. The model has been rigorously validated against previous studies, specifically under non-isothermal conditions. It enables the calculation of mass loss and the reduction extent of specific phases of iron oxide, with the rate constant (k-value) curve across different temperatures. Moreover, the model adaptability is highlighted by its effective application in various BF conditions, as demonstrated by its use with data from the reference plants.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of water content on the kinetics and mechanisms of hydrogen reduction using industrial iron ore pellets at 873 K - 1173 K 含水量对在 873 K - 1173 K 下使用工业铁矿球团进行氢还原的动力学和机理的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-17 DOI: 10.2355/isijinternational.isijint-2023-443

Oscar Hessling, Julia Brännberg Fogelström, Niklas Kojola, Johan Martinsson

{"title":"The influence of water content on the kinetics and mechanisms of hydrogen reduction using industrial iron ore pellets at 873 K - 1173 K","authors":"Oscar Hessling, Julia Brännberg Fogelström, Niklas Kojola, Johan Martinsson","doi":"10.2355/isijinternational.isijint-2023-443","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-443","url":null,"abstract":"This work aims to study the effect of pH2O in the atmosphere during hydrogen reduction of iron oxide over a temperature range relevant to industrial practice. To further the industrial context, industrially produced hematite iron ore pellets are utilized. A resistance heated furnace was employed to conduct experiments, in the temperature range 873 K – 1173 K. A water vapor generator was used to control water vapor partial pressure during hydrogen reduction in the range 0-15% pH2O. The system was carefully designed to ensure precise control of the water content in the reaction gas. Thermal Gravimetric Analysis (TGA) was used to follow the reduction of the iron ore pellets. To understand the reaction mechanisms, Scanning Electron Microscopy (SEM) was used to study the microstructure of partially reduced pellets. Results suggest the reduction rate is profoundly affected by water at 873 K, less so when the temperature is increased. The microstructure is also highly affected by pH2O at 873 K, at higher temperatures the microstructure is less affected. The influences of gas dilution and chemical reaction rate on these aspects are discussed.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production and Technology of Iron and Steel in Japan during 2023 2023 年日本的钢铁生产与技术

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-15 DOI: 10.2355/isijinternational.64.8app_i

引用次数: 0

Agglomeration Force Exerted between Various Types of Solid-phase Oxides in Molten Steel 钢水中各类固相氧化物之间的聚结力

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-10 DOI: 10.2355/isijinternational.isijint-2024-135

Katsuhiro Sasai, Takashi Morohoshi

{"title":"Agglomeration Force Exerted between Various Types of Solid-phase Oxides in Molten Steel","authors":"Katsuhiro Sasai, Takashi Morohoshi","doi":"10.2355/isijinternational.isijint-2024-135","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-135","url":null,"abstract":"In this study, to elucidate the agglomeration mechanism of various inclusions in molten steel based on their interfacial chemical interactions, the agglomeration forces exerted between the solid-phase oxides of MgO, MgAl2O4, ZrO2, SiO2, and TiO2 in molten steel, in addition to those between the reference material Al2O3 have been measured directly. We experimentally verified for the first time that the agglomeration force due to the cavity bridge force in molten steel acts in a relatively stable manner between all solid-phase oxides that are difficult to wet with molten steel. Furthermore, this force decreased with increasing O concentration in molten steel, which is attributed to the interfacial activation effect caused by the adsorption of oxygen at the interface between the oxides and molten steel. The agglomeration properties of various oxide inclusions in the deoxidized molten steel were further evaluated from the perspectives of both agglomeration force and thermodynamics. Quantitative analysis indicated easy agglomeration of oxide inclusions in the order MgO < TiO2 < SiO2 < MgAl2O4 < ZrO2 < Al2O3. A comparative evaluation of the agglomeration and external forces acting on the oxide inclusions in molten steel suggests that any oxide inclusion in the deoxidized state forms cavity bridges and agglomerates and retains that state under intense molten steel flow. However, these agglomerated inclusions may separate again under a molten steel flow at a high O concentration. The extent of separation depends primarily on the type of oxide used.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feasibility of Electro-Reduction of Metals in Sulfide-Based Copper Removal Slag for Steelmaking 电还原炼钢用硫化物脱铜渣中金属的可行性

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-10 DOI: 10.2355/isijinternational.isijint-2024-035

Zhihao Lu, Xiangwei Liao, Chenglin Zhao, Deli Shang, Haiwei Wang, Chengjun Liu

{"title":"Feasibility of Electro-Reduction of Metals in Sulfide-Based Copper Removal Slag for Steelmaking","authors":"Zhihao Lu, Xiangwei Liao, Chenglin Zhao, Deli Shang, Haiwei Wang, Chengjun Liu","doi":"10.2355/isijinternational.isijint-2024-035","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-035","url":null,"abstract":"This paper proposed an innovative electrochemical method for copper recovery from spent sulfide slag (Na2S-FeS-Cu2S), generated during copper removal from iron-based melts. It aims to reduce the high decopperization agents' consumption caused by low copper distribution ratio during the copper removal process, address the cost issues by recycle of slag and recovery of copper, and expand the application potential of the emerging copper removal method using the sulfide slag systems. The feasibility of electro-recovery of copper is verified by cyclic voltammetry tests and potentiostatic electrolysis experiments. The results show that in the Na2S-FeS-Cu2S melt, although copper cannot be reduced alone without reducing iron, rough separation can be achieved by controlling the temperature. The current efficiency of Cu+ reduction in the molten sulfide is about 9.1% due to electronic conduction in the sulfide melt, which needs further improvement. The slag treated by the innovative electrochemical process can be reused, as the XRD results show that it has a similar composition to the primary slag unused.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0