Isij International最新文献_第3页

Alloying pre-alloyed Fe-Mo powders by silicon carbide addition 通过添加碳化硅使预合金化铁-钼粉末合金化

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-28 DOI: 10.2355/isijinternational.isijint-2024-139

Nattaya Tosangthum, Thanyaporn Yotkaew, Rungtip Krataitong, Monnapas Morakotjinda, Preeya Nakornkaew, Piyanuch Nakpong, Ruangdaj Tongsri

{"title":"Alloying pre-alloyed Fe-Mo powders by silicon carbide addition","authors":"Nattaya Tosangthum, Thanyaporn Yotkaew, Rungtip Krataitong, Monnapas Morakotjinda, Preeya Nakornkaew, Piyanuch Nakpong, Ruangdaj Tongsri","doi":"10.2355/isijinternational.isijint-2024-139","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-139","url":null,"abstract":"This work demonstrated that the silicon carbide addition to pre-alloyed Fe-Mo powder could result either in the formation of steel or iron microstructure depending on the added silicon carbide content. With 1.0 wt. % silicon carbide addition, slowly cooled sintered Fe-Mo-Si-C alloys showed steel microstructures consisting of proeutectoid ferrite and eutectoid transformation product in the form of ferrite + carbide mixture. With 2.0 wt. % silicon carbide addition, slowly cooled sintered Fe-Mo-Si-C alloys with Mo contents of ≥ 0.85 wt.% microstructures comprised ferrite + austenite constituents in the forms of either degenerate upper bainite or ausferrite. With ≥ 3.0 wt. % silicon carbide addition, ductile iron-like microstructures were developed in sintered Fe-Mo-Si-C alloys. The change of microstructures in experimental sintered alloys was attributed to the combined effect of alloying molybdenum, silicon, and carbon elements. Tensile strength and hardness increased with increasing added SiC content while ductility varied with microstructural components.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"17 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216906","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

Nucleation-controlled selection of metastable ferrite in solidification of Fe-22mass%Mn-0.7mass%C alloy 在 Fe-22mass%Mn-0.7mass%C 合金凝固过程中受成核控制的可转移铁素体选择

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-26 DOI: 10.2355/isijinternational.isijint-2024-185

Taka Narumi, Makoto Ohta, Kengo Fujita, Ryoji Katsube, Hideyuki Yasuda

{"title":"Nucleation-controlled selection of metastable ferrite in solidification of Fe-22mass%Mn-0.7mass%C alloy","authors":"Taka Narumi, Makoto Ohta, Kengo Fujita, Ryoji Katsube, Hideyuki Yasuda","doi":"10.2355/isijinternational.isijint-2024-185","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-185","url":null,"abstract":"The competition between the ferrite and austenite for nucleation in the melt can result in various solidification sequences in the Fe-based alloy. This study demonstrates that the austenite solidification was initiated by metastable ferrite nucleation followed by ferrite-austenite transformation even in Fe-22mass%Mn-0.7mass%C, where the austenite is the primary phase in equilibrium. Time-resolved X-ray diffraction measurements were performed using a time-resolved X-ray tomography apparatus to identify the metastable ferrite nucleation followed by the austenite solidification. X-ray radiography was performed to observe the microstructure evolution through the metastable ferrite nucleation followed by the austenite solidification. The metastable ferrite nucleation was preferably selected when the completely melted specimen was cooled. During subsequent cooling, the ferrite massively transformed to the austenite in the solid state, and multiple austenite grains were produced in a single ferrite grain through ferrite-austenite transformation. The ferrite-austenite transformation was immediately followed by the coarsening of multiple austenite grains. When the ferrite-austenite transformation occurred in a semisolid state consisting of the ferrite and liquid phase, the liquid phase, which isolated the austenite grains, suppressed the coarsening of austenite grain. The typical austenite grain size ranged from 100 to 500 μm. Thus, the present results suggest that the ferrite-austenite transformation following the metastable ferrite nucleation has the potential to control the austenite grain size in as-cast microstructures.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"59 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216907","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

Real-time observation of stress-strain behavior beyond necking in martensitic steel by in-situ synchrotron X-ray diffraction 通过原位同步辐射 X 射线衍射实时观测马氏体钢中超出缩颈的应力应变行为

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-26 DOI: 10.2355/isijinternational.isijint-2024-093

Avala Lavakumar, Sukyoung Hwang, Kazuho Okada, Myeong-heom Park, Atul H. Chokshi, Nobuhiro Tsuji

{"title":"Real-time observation of stress-strain behavior beyond necking in martensitic steel by in-situ synchrotron X-ray diffraction","authors":"Avala Lavakumar, Sukyoung Hwang, Kazuho Okada, Myeong-heom Park, Atul H. Chokshi, Nobuhiro Tsuji","doi":"10.2355/isijinternational.isijint-2024-093","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-093","url":null,"abstract":"In general, the stress-strain relationship of materials obtained by standard uniaxial tensile test, which can identify the hardening behavior only up to necking. Beyond necking, the material behavior is usually estimated by extrapolating or numerical modelling based on hardening behavior prior to the uniform elongation. This study investigated the post-necking hardening behavior of a fully martensitic steel by in-situ synchrotron X-ray diffraction during tensile deformation. From the in-situ results, the dislocation density, lattice strain and phase stress were calculated within the necked region and outside the necked region. A near steady-state flow with some hardening was observed within the necked region of a martensitic steel. However, beyond uniform elongation, outside the necked region the dislocation density and phase stress decreased slightly, suggesting stress relaxation. Steady-state flow and dislocation densities at large strains suggest dynamic recovery occurs in the martensitic steel at room temperature.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"8 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216910","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

Friction Stir Welding of 1.4 GPa-Grade Tempered Martensitic Steel 1.4 GPa 级回火马氏体钢的搅拌摩擦焊

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-26 DOI: 10.2355/isijinternational.isijint-2024-175

Yasuyuki Miyano, Hiroki Washiya, Hiromu Sato, Yoshihiro Aoki, Mitsuhiko Kimura, Kohsaku Ushioda, Hidetoshi Fujii

{"title":"Friction Stir Welding of 1.4 GPa-Grade Tempered Martensitic Steel","authors":"Yasuyuki Miyano, Hiroki Washiya, Hiromu Sato, Yoshihiro Aoki, Mitsuhiko Kimura, Kohsaku Ushioda, Hidetoshi Fujii","doi":"10.2355/isijinternational.isijint-2024-175","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-175","url":null,"abstract":"Thermal hysteresis in fusion welding causes significant weld deterioration in medium- and high-carbon steels. Therefore, the development of an effective alternative welding process is required. Friction stir welding (FSW) is a solid-state welding process performed in an atmosphere that reduces the risks associated with melting and solidification of metals, making it an effective alternative method. Furthermore, it facilitates a flexible in-process control of heat input, which can be achieved by controlling the welding parameters. Considering these, the authors conducted a series of studies to elucidate the characteristics of FSW for medium- and high-carbon steels, including high-strength tempered steels.This paper presents the results of applying FSW to 1.4 GPa-grade tempered JIS-S55C steel plates. Five distinct weld types were created by varying the welding parameters, including tool rotation and welding speed. The temperature of the interface between the tool and in-process material was measured using a thermal imaging camera. The microstructure of the welds was evaluated using optical microscopy and field-emission scanning electron microscopy (FE-SEM) with an electron-backscatter diffraction (EBSD) measurement system. The mechanical properties of the welds were evaluated through Vickers hardness and tensile tests. Digital image correlation analysis was employed to analyze the local deformation during the tensile test.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"459 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227006","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 intercritical annealing on microstructure and toughness of medium-Mn steel with elongated prior-austenite grains formed via two-step hot rolling process 临界退火对通过两步热轧工艺形成的具有细长先奥氏体晶粒的中锰钢显微组织和韧性的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-22 DOI: 10.2355/isijinternational.isijint-2024-180

Kyosuke Matsuda, Takuro Masumura, Toshihiro Tsuchiyama, Misa Takanashi, Takuya Maeda, Shuichi Nakamura, Ryuji Uemori

{"title":"Effect of intercritical annealing on microstructure and toughness of medium-Mn steel with elongated prior-austenite grains formed via two-step hot rolling process","authors":"Kyosuke Matsuda, Takuro Masumura, Toshihiro Tsuchiyama, Misa Takanashi, Takuya Maeda, Shuichi Nakamura, Ryuji Uemori","doi":"10.2355/isijinternational.isijint-2024-180","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-180","url":null,"abstract":"Fe-9 mass%Ni alloy is widely used as a cryogenic steel owing to its excellent low-temperature strength and toughness. However, Ni is an expensive element, with medium-Mn steel considered an inexpensive alternative. Considering the Fe-10%Mn-0.1%C alloy is brittle at low temperatures, the application of intercritical annealing with two-step hot rolling could lead to toughening. Herein, the effect of intercritical annealing on the toughness of a Fe-10%Mn-0.1%C alloy with elongated prior-austenite grains (PAGs) formed via a two-step hot-rolling process was investigated. Intercritical annealing was performed on the specimens with and without two-step hot rolling. For both specimens, intercritical annealing resulted in softening of α'-martensite and an increase in the amount of retained austenite. In the specimen not subjected to the two-step hot rolling process, the fracture morphology transitioned from ductile to intergranular with a decrease in the temperature. Intercritical annealing improved the toughness when ductile fracture occurred. In the case of intergranular fracture, the effect of intercritical annealing on the toughness was negligible. In the two-step hot-rolled specimen with elongated PAGs, the fracture morphology transitioned from ductile to separation fracture with ductile fracture, and intercritical annealing improved the toughness at all temperature ranges. The improvement in toughness during separation fracture is attributed to the expansion of the plastic zone owing to ductile crack progression and the formation of sub-cracks, which promote the strain-induced transformation of retained austenite and ε-martensite.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"20 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216908","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 Cu addition on localized corrosion originating from MnS inclusions for low-alloy steel in a 3% NaCl solution 添加铜对低合金钢在 3% 氯化钠溶液中因 MnS 包裹体引起的局部腐蚀的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-22 DOI: 10.2355/isijinternational.isijint-2024-184

Takuya Hara, Hiroyuki Fuji

{"title":"Effect of Cu addition on localized corrosion originating from MnS inclusions for low-alloy steel in a 3% NaCl solution","authors":"Takuya Hara, Hiroyuki Fuji","doi":"10.2355/isijinternational.isijint-2024-184","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-184","url":null,"abstract":"The effect of MnS inclusions on the localized corrosion of low-alloy steel in a 0.5 mol/kg (3 %) NaCl solution was investigated to propose countermeasures for inhibiting localized corrosion initiated by MnS inclusions. Low alloy steels without MnS inclusions did not corrode in a 0.5 mol/kg (3 %) NaCl solution, regardless of the addition of Cu. That is, no matrix improvement effect due to solute Cu was confirmed. Slight corrosion occurred in the Cu containing steel with MnS inclusions; however, the MnS inclusions remained. Cu7.2S4 precipitated on the MnS in contact with a 0.5 mol/kg (3 %) NaCl solution. Therefore, Cu7.2S4 precipitates on the MnS inclusions during immersion, which could suppress the localized corrosion initiated by the MnS inclusions because Cu sulfide is not dissolved based on potential-pH diagram. The addition of Cu in a 0.5 mol/kg (3 %) NaCl solution does not improve the corrosion resistance of the matrix due to solute Cu but does suppress localized corrosion initiating from MnS by precipitating Cu sulfide on MnS.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"4 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216909","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

Analysis of Generation Mechanism of Unimodal and Bimodal Waveform Detection Signals of a Whole Roll Flatness Meter 全辊平面度测量仪的单模态和双模态波形检测信号生成机制分析

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-09 DOI: 10.2355/isijinternational.isijint-2024-169

Tongyuan Zhang, Shuang Liao, Juntao Gao, Wenkai Hao, Hongmin Liu

{"title":"Analysis of Generation Mechanism of Unimodal and Bimodal Waveform Detection Signals of a Whole Roll Flatness Meter","authors":"Tongyuan Zhang, Shuang Liao, Juntao Gao, Wenkai Hao, Hongmin Liu","doi":"10.2355/isijinternational.isijint-2024-169","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-169","url":null,"abstract":"Under certain conditions, the whole roll flatness meter outputs a bimodal waveform signal, which is clearly different from the conventional unimodal waveform signal. Since detection relies on the extraction of crest values and the values of the two waveforms do not have the same linearity, the presence of the two waveforms of different channels will clearly give rise to errors in the calculated flatness distribution. To develop an effective extraction method, it is necessary to accurately analyze the evolution of the waveforms. In this paper, the finite element method is used to calculate the load of the sensor, the stress distribution of each analysis surface and the deformation of the sensor mounting hole during the real-time detection to analyze the mechanism of the waveforms. The results show that unimodal and bimodal waveforms are produced under different strip tension and wrap angle conditions. In addition, the radial stress of the roll surface always presents two stress wave distributions. With increasing strip tension or wrap angle, the phase difference between the two waves increases. The stress distribution will change the deformation trend of the mounting hole and affect the stress distribution state of the sensor. When the phase difference of the stress waves exceeds the covering range of the sensor, the output signal changes from a unimodal waveform to a bimodal waveform. Finally, by setting up an experimental platform with variable tension and wrap angle, the relationship between the output waveforms and the working conditions in the simulation is reproduced.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"84 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945049","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 MgO/CaO ratio on viscosity and phase structure of chromium-containing high-titanium blast furnace slag 氧化镁/氧化钙比例对含铬高钛高炉渣粘度和相结构的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-09 DOI: 10.2355/isijinternational.isijint-2024-148

Jiawen Chen, Weichao Zheng, Liangbin Chen, Ying Deng, Jiachang Hao, Zhenyun Tian, Guibao Qiu

引用次数: 0

Modification of Copper Slag Composite with Water-Quenched Silicon-Manganese Slag 用水淬硅锰渣改性铜渣复合材料

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-31 DOI: 10.2355/isijinternational.isijint-2023-471

Bin Zheng, Liang Jiang, Fenglan Han, Hui Su, Pengxiang Li, Xinwei Gong

{"title":"Modification of Copper Slag Composite with Water-Quenched Silicon-Manganese Slag","authors":"Bin Zheng, Liang Jiang, Fenglan Han, Hui Su, Pengxiang Li, Xinwei Gong","doi":"10.2355/isijinternational.isijint-2023-471","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-471","url":null,"abstract":"Metallurgical industries often discharge slag containing valuable elements that are poorly utilized when producing copper alloys and silicon-manganese alloys. To improve the utilization rate, in this study, a method to mix copper slag with water-quenched silicon-manganese slag and CaO for roasting and modification was proposed. In this work, FactSage 8.0, DSC-TG, and XRD were used to examine the phase change during the modification process and investigate the impacts of the CaO content, roasting temperature, and holding time on the modification effect. The results showed that the addition of water-quenched silicon-manganese slag and CaO could effectively promote the transformation of fayalite to (Mn, Mg, Fe)Fe2O4, with the highest conversion rate occurring at a 10% CaO content. An increase in the temperature and prolongation of the time facilitated fayalite transformation, but excessive temperature or time could result in iron loss. The optimal recovery rate and iron grade were achieved with roasting at 1400 °C for 60 min. This method can provide a concentrate suitable for producing copper-containing antibacterial stainless steel and wear-resistant cast iron, and the tailings can be used to produce ceramic materials.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":"2 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866376","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

Lattice Defects Present beneath Crack Initiation, Propagation, and Final Fracture Regions on the Same Hydrogen Embrittlement Fracture Surface of Martensitic Steel 马氏体钢同一氢脆断裂表面上裂纹起始、扩展和最终断裂区域下方的晶格缺陷

IF 1.8 4区材料科学

Isij International Pub Date : 2024-07-27 DOI: 10.2355/isijinternational.isijint-2024-147

Takahiro Chiba, Kenichi Takai

引用次数: 0