Isij International最新文献_第4页

Solidification microstructure and mechanical properties of B1-type TiC in Fe-Ti-C ternary alloys 铁-钛-碳三元合金中 B1 型 TiC 的凝固微观结构和力学性能

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-19 DOI: 10.2355/isijinternational.isijint-2024-166

Shuntaro Ida, Kengo Watanabe, Kyosuke Yoshimi

{"title":"Solidification microstructure and mechanical properties of B1-type TiC in Fe-Ti-C ternary alloys","authors":"Shuntaro Ida, Kengo Watanabe, Kyosuke Yoshimi","doi":"10.2355/isijinternational.isijint-2024-166","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-166","url":null,"abstract":"The microstructure of the B1-type TiC formed during solidification and its mechanical properties were investigated using arc-melted Fe–Ti–C ternary alloys. The TiC formed at relatively high temperatures in the liquid as the primary phase exhibited a dendritic shape. With decreasing temperature and/or decreasing Ti and C content in the liquid, the morphology of the TiC changed to a cubic shape with a {001}TiC habit plane, a plate shape with a {011}TiC habit plane, and a needle shape with a preferential growth direction of <001>TiC. The morphology of the TiC was characterized by the anisotropy of its surface energy and its growth rate. The cubic shape with a {001}TiC habit plane was formed as a result of the {001}TiC surface exhibiting the lowest surface energy among the TiC surfaces. However, the plate shape with a {011}TiC habit plane and the needle shape with a <001>TiC preferential growth direction likely formed because the slowest and fastest growth rates corresponded to the <011>TiC and <001>TiC directions, respectively. At room temperature, the alloy with dendritic TiC was fractured in the elastic deformation region because TiC exhibited no plastic deformation. However, the results obtained at 800°C suggested that the TiC exhibited plastic deformability and that the alloy with the dendritic TiC was also plastically deformed.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"23 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740235","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

Rapid Identification of Liquid Steel Temperature in Tundish Based on Blackbody Cavity Sensor 基于黑体空腔传感器快速识别钢包中的液态钢温度

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-10 DOI: 10.2355/isijinternational.isijint-2023-499

Jiaocheng Ma, Linghui Meng, Zhendong Liu, Xin Zhao

{"title":"Rapid Identification of Liquid Steel Temperature in Tundish Based on Blackbody Cavity Sensor","authors":"Jiaocheng Ma, Linghui Meng, Zhendong Liu, Xin Zhao","doi":"10.2355/isijinternational.isijint-2023-499","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-499","url":null,"abstract":"In the continuous casting process, the temperature of liquid steel in tundish determines the casting speed and secondary cooling conditions, and then influences the billet quality. It's very important to measure the temperature of liquid steel in tundish quickly and accurately. However, the initial response lag of blackbody cavity sensor is inevitable since the time is required for the sensor inner wall and the liquid steel reaching thermal equilibrium by heat transfer. In this paper, in order to eliminate the initial response lag of sensor, a heat transfer model of sensor is established. The heat transfer characteristics and cavity integral emissivity of sensor with different depths immersed into liquid steel are analyzed. The analytical solution of sensor temperature is derived by separation of variables method and superposition principle, and is verified by the actual temperature measurement data. Then an innovative method of liquid steel temperature rapid identification is deduced and validated by the actual measurement data. The results show that the initial response lag of sensor is greatly shortened and the temperature measurement efficiency is improved. This study provides a theoretical method for improving the initial response speed of sensor.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"20 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567606","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

Effect of Fluoride Ions in Slag on the Dynamic Change of the Interfacial Tension between Liquid Iron and Molten Slag 炉渣中的氟离子对铁液与熔融炉渣之间界面张力动态变化的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-09 DOI: 10.2355/isijinternational.isijint-2024-134

Masanori Suzuki, Kenta Iwakura, Yuichi Tsukaguchi, Kazuaki Mishima

{"title":"Effect of Fluoride Ions in Slag on the Dynamic Change of the Interfacial Tension between Liquid Iron and Molten Slag","authors":"Masanori Suzuki, Kenta Iwakura, Yuichi Tsukaguchi, Kazuaki Mishima","doi":"10.2355/isijinternational.isijint-2024-134","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-134","url":null,"abstract":"The interfacial tension between the liquid steel and molten slag is one of the key properties to control the entrapment of mold flux in molten steel in the continuous casting process. A dynamic change of the interfacial tension is observed when deoxidized iron and silicate slag are in contact, which can be explained by the oxygen absorption and desorption at the iron/slag interface. However, the dynamic change of the interfacial tension is influenced by other surfactant components of the molten iron and slag. Fluoride ions are fundamental component of mold flux, and recognized as the surface active component of molten slag. The effect of fluoride ions in slag on the interfacial tension has not been critically evaluated. Here, the effect of fluoride ions in slag on the interfacial tension between molten iron and molten silicate slag was evaluated at 1823 K, where the fluoride-containing slag compositions were designed to exhibit the same SiO2 activity and slag viscosity as those of the fluoride-free slag. Compared with the case of molten iron and fluoride-free slag, the interfacial tension between the molten iron and fluoride-containing slag was initially lower. Except the effect of oxygen adsorption, fluoride ion was considered to directly decrease the interfacial tension. However, as the fluoride content in slag was higher, the interfacial tension tended to show the higher value at the final state. This behavior was attributed mainly to fluoride vaporization as SiF4, which reduce the SiO2 activity in slag and thus equivalent oxygen content at the iron/slag interface.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"14 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567605","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

Reduction degradation of lump, sinter, and pellets in blast furnace with hydrogen injection 高炉喷氢可降低块料、烧结矿和球团矿的降解率

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-08 DOI: 10.2355/isijinternational.isijint-2024-114

Muhammad Irfan Ahadian Barustan, Evan Copland, Thi Bang Tuyen Nguyen, Damien O’dea, Tom Honeyands

{"title":"Reduction degradation of lump, sinter, and pellets in blast furnace with hydrogen injection","authors":"Muhammad Irfan Ahadian Barustan, Evan Copland, Thi Bang Tuyen Nguyen, Damien O’dea, Tom Honeyands","doi":"10.2355/isijinternational.isijint-2024-114","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-114","url":null,"abstract":"The increase of hydrogen usage in a blast furnace is expected to affect the reduction degradation of ferrous burden materials and influence the gas permeability inside the furnace. Previous studies show a disagreement on the effect of H2 on reduction degradation, with the extent of degradation depending on the H2 content and type of ferrous burden materials. In this study, the reduction degradation of sinter, lump, and pellet was compared using the reduction degradation test under different gas mixtures containing CO and H2, covering the gas composition of conventional and H2 injection blast furnaces. Lump (Newman Blend Lump NBLL) and pellets show a lower RDI-2.8 than sinter under all the gas compositions tested. Higher RDI-2.8 values were obtained for all burden materials with a reducing gas containing both CO and H2 compared to CO or H2 only. The addition of H2 to CO increases the pore diffusion rate allowing reducing gas to reach the centre part of the particles, leading to the reduction of hematite to magnetite and subsequent crack formation across the whole particles. Compared to the conventional blast furnace case, NBLL lump and sinter show a lower degradation for the H2 injection case while it was the opposite for the pellet, suggesting the necessity of reviewing overall burden materials to optimise the hydrogen injection in the blast furnace.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"25 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567607","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

Estimation of True Hardness and Quantitative Evaluation of Auto-Tempering in As-Quenched Martensitic Steels 淬火马氏体钢的真实硬度估算和自动回火定量评估

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-05 DOI: 10.2355/isijinternational.isijint-2024-140

Osamu Idohara, Youhei Hiyama, Yoshitaka Misaka, Setsuo Takaki, Toshihiro Tsuchiyama

{"title":"Estimation of True Hardness and Quantitative Evaluation of Auto-Tempering in As-Quenched Martensitic Steels","authors":"Osamu Idohara, Youhei Hiyama, Yoshitaka Misaka, Setsuo Takaki, Toshihiro Tsuchiyama","doi":"10.2355/isijinternational.isijint-2024-140","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-140","url":null,"abstract":"The hardness of martensitic steels with high Ms temperatures is reduced by auto-tempering after transformation, therefore the true hardness of martensite with carbon in fully solid solution is not known. In this study, we investigated a method to quantitatively evaluate the true hardness of quenched martensite unaffected by auto-tempering and the effect of auto-tempering was quantitatively evaluated by the diffusion area of carbon in bcc iron at temperatures below 400°C. As a result, it was clarified that the effect of auto-tempering is more pronounced in steels with an M50 temperature higher than 300°C and that the softening behavior of martensitic steels can be uniformly evaluated regardless of the carbon content if the activation energy of carbon diffusion is known. Furthermore, it was clarified that the degree of auto-tempering can be quantitatively evaluated by calculating the integral diffusion area S (= ∑Dt) below the M50 temperature during quenching.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567609","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

Hydrogen embrittlement properties of rapid tempered high-Si steel and effects of the carbide and retained austenite on its properties 快速回火高硅钢的氢脆特性以及碳化物和残余奥氏体对其特性的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-05 DOI: 10.2355/isijinternational.isijint-2024-181

Manami Sunako, Masataka Mizumoto, Azusa Ooi, Eiji Tada

{"title":"Hydrogen embrittlement properties of rapid tempered high-Si steel and effects of the carbide and retained austenite on its properties","authors":"Manami Sunako, Masataka Mizumoto, Azusa Ooi, Eiji Tada","doi":"10.2355/isijinternational.isijint-2024-181","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-181","url":null,"abstract":"Automotive suspension springs are required to be high-strength and lightweight, and currently have a maximum strength of 2000 MPa. In addition, they must have high resistance to hydrogen embrittlement in the service environment. From previous research, Si addition or rapid tempering improves the hydrogen embrittlement resistance of low alloy steel. In this study, we investigated the hydrogen embrittlement properties of steel samples with different Si contents and tempering rates and the effects of the fine iron carbides and retained austenite on its properties for 2000 MPa suspension spring steel. JISSUP7 (2.0Si) and SAE9254 (1.4Si) spring steels were tempered at different tempering rates by induction (IH) and furnace heating (FH) methods. Four-point bending tests under corrosion cycles were performed on these steels, and the time to failure was measured. The results show that the 2.0Si-IH steel with higher Si content and higher tempering rate has the longest fracture life and highest resistance to hydrogen embrittlement, even with relatively high diffusible hydrogen content. The size and volume fraction of iron carbides and retained austenite were evaluated by TEM, EBSD, and synchrotron XRD, and the 2.0Si-IH steels were found to have the smallest size and the highest volume fraction of fine iron carbides Fe2-3C(ε) and the highest amount of retained austenite. It is considered that the fine iron carbides of Fe2-3C(ε) work as hydrogen trap sites and that their high dispersion suppresses dislocation movement. They suppress hydrogen accumulation in stress concentrated areas and are expected to improve resistance to hydrogen embrittlement.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"78 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567611","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

Effect of Deformation-induced α’-martensite and Serrated Grain Boundaries on The Deformation and Fracture Behavior of 201 Austenitic Stainless Steel at Low Temperature 变形诱导的 α'-马氏体和铁素体晶界对 201 奥氏体不锈钢低温变形和断裂行为的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-05 DOI: 10.2355/isijinternational.isijint-2024-091

Pham Mai Khanh, Hoang Thi Ngoc Quyen

{"title":"Effect of Deformation-induced α’-martensite and Serrated Grain Boundaries on The Deformation and Fracture Behavior of 201 Austenitic Stainless Steel at Low Temperature","authors":"Pham Mai Khanh, Hoang Thi Ngoc Quyen","doi":"10.2355/isijinternational.isijint-2024-091","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-091","url":null,"abstract":"This study focuses on the fracture mode of 201 austenitic steel at room temperature (RT) and at -40 °C for one hour and three hours. The results reveal that at room temperature, the fracture is dominated by ductile behavior. At - 40 °C, the fracture mode is a mix of ductile and brittle behavior. Type 201 austenitic stainless steel has a low stacking fault energy value (about 16 mJ.m-2 at RT), leading to the activation of the transformation-induced plasticity (TRIP) effect. When the sample is soaked at -40 °C for three hours, deformation-induced martensite transition (DIMT) formation with the volume fraction rises significantly to 19.9 %. At -40 °C for 3 hours, the alloy's impact energy absorption is reduced by 39%. The interaction of deformed austenite grains with previous austenite grain boundaries results in the formation of serrated grain boundaries in samples soaked at -40 °C. Serrated grain boundaries prevent crack propagation and reduce crack expansion at the grain boundary during the fracture of this alloy. The width of the crack at serrated grain boundaries is 38% less than that of the straight grain boundary.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"40 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567608","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

Investigation of the effects of mechanical properties and carbon content on cold cracking in laser welds of high-strength thin steel sheets 研究机械性能和碳含量对高强度薄钢板激光焊接冷裂纹的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-05 DOI: 10.2355/isijinternational.isijint-2024-144

Hajime Ashida, Hiroki Fujimoto

{"title":"Investigation of the effects of mechanical properties and carbon content on cold cracking in laser welds of high-strength thin steel sheets","authors":"Hajime Ashida, Hiroki Fujimoto","doi":"10.2355/isijinternational.isijint-2024-144","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-144","url":null,"abstract":"This study reports a case of cold cracking along welds, which arises from solidification cracking within the crater during the laser welding of high-strength steel sheets. In this investigation, we aimed to delineate the factors influencing cold cracking that originates from solidification cracking in the crater. This was achieved by using steel sheets whose mechanical properties (tensile strength: 0.6 to 1.5 GPa) and chemical composition (carbon content: 0.20 to 0.55%) were individually adjusted. The evaluation method involved performing laser welding in a stitch pattern on an oiled steel sheet, with variations in welding length. The evaluation focused on the maximum welding length at which cold cracking occurred (LMAX). The results indicated that while a high tensile strength of the steel sheet marginally increased the LMAX, the impact remained limited. Conversely, the carbon content of the steel sheet significantly influenced cold cracking; the LMAX for carbon contents of 0.30% and 0.45% was substantially greater than that for 0.20%. However, an unusual behavior was observed at a carbon content of 0.55%, where the LMAX was smaller than that for 0.45%, despite the significant hardening of the weld metal. This phenomenon was hypothesized to occur because the tensile residual stresses in the welds decreased as martensitic transformation starting temperature lowered and the expansion strain during the transformation increased with higher carbon content.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"2015 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567610","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

System for recognizing gas flow distribution patterns in blast furnace centre based on computer vision 基于计算机视觉的高炉中心煤气流分布模式识别系统

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-03 DOI: 10.2355/isijinternational.isijint-2023-463

Fu-min Li, Chang-hao Li, Song Liu, Xiao-jie Liu, Jun Zhao, Qing Lyu

{"title":"System for recognizing gas flow distribution patterns in blast furnace centre based on computer vision","authors":"Fu-min Li, Chang-hao Li, Song Liu, Xiao-jie Liu, Jun Zhao, Qing Lyu","doi":"10.2355/isijinternational.isijint-2023-463","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-463","url":null,"abstract":"Reasonable gas flow distribution plays a decisive role in the smooth operation of blast furnace smelting, but it is difficult to detect the gas flow distribution in blast furnace in real time. An intelligent prediction and identification system of central gas flow distribution based on infrared image of blast furnace and cross-beam temperature measurement is constructed(C-GFD). The system is mainly composed of two models, namely the image model and the prediction and recognition model. In the image model, three kinds of derived parameters, namely, central gas flow area, temperature and offset, are extracted by the image entropy and neighbourhood valley-emphasis (ENVE) Otsu, thermodynamic heat transfer and grey scale centroid algorithms, and then the statistical relationship between the change of image information and the distribution of gas flow is investigated. In the prediction and recognition model is established by the algorithms based on convolutional neural network long and short-term memory (CNN-LSTM) and Euclidean-weighted fuzzy C-mean clustering (E-FCM) to complete the prediction of the three types of derived parameters, and the prediction data is transferred to the recognition model to complete the recognition of the central gas flow distribution pattern. The test results show that the system provides real-time and reliable gas flow reference information for blast furnace operators with 95% accuracy in model prediction and more than 90% accuracy in pattern recognition of various types of central gas flow distribution.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"50 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515122","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

Effect of shape and composition of steel particles on simultaneous H2 production and CO2 fixation 钢颗粒的形状和成分对同时产生 H2 和固定 CO2 的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-27 DOI: 10.2355/isijinternational.isijint-2024-129

Hayao Yagi, Norika Nakazawa, Naoki Yamamoto, Hiromi Eba

引用次数: 0