Isij International最新文献_第2页

Evaluation for Carbonization Rate of Porous Iron Whisker with CO 用二氧化碳评估多孔铁须的碳化率

IF 1.8 4区材料科学

Isij International Pub Date : 2024-09-11 DOI: 10.2355/isijinternational.isijint-2024-238

Ryota Higashi, Daisuke Maruoka, Yuji Iwami, Taichi Murakami

引用次数: 0

In Situ Observation of Sliding Deformation in Commercially Pure Titanium Sheet with TiO2 Film 原位观测带有二氧化钛薄膜的商用纯钛板的滑动变形

IF 1.8 4区材料科学

Isij International Pub Date : 2024-09-11 DOI: 10.2355/isijinternational.isijint-2024-090

Ryotaro Miyoshi, Genki Tsukamoto

{"title":"In Situ Observation of Sliding Deformation in Commercially Pure Titanium Sheet with TiO2 Film","authors":"Ryotaro Miyoshi, Genki Tsukamoto","doi":"10.2355/isijinternational.isijint-2024-090","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-090","url":null,"abstract":"To investigate the factors that cause variations in the friction coefficients of commercially pure titanium sheets with titanium oxide films, the sliding deformation during ball-on-block sliding tests was observed in situ and compared with electron backscatter diffraction analyses of the same regions. Under a vertical load of 0.1 N, the friction coefficient was stable at a low level of approximately 0.12. By contrast, at 0.5 N, the friction coefficient fluctuated widely between 0.20 and 0.80. At 2.0 and 4.0 N, the friction coefficient was stable again at a high level of approximately 0.30 and 0.40, respectively. The fluctuation in friction coefficient at a vertical load of 0.5 N was investigated further based on the Taylor factor for the uniaxial compression of the titanium grains directly beneath the contact point. Notably, the friction coefficient was negatively correlated with the Taylor factor of the underlying grains. Thus, it can be presumed that the plowing term of the friction coefficient increases as the compressive strain on titanium increases. At vertical loads of 2.0 and 4.0 N, the contact area is larger, so the ball is always in contact with multiple grains. Thus, the influence of the Taylor factor of individual grains can be assumed to be averaged, thereby reducing the variation in friction coefficient.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216900","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

Phonon mean free path of silicate glasses: a useful parameter to distinguish between framework and nonframework cations 硅酸盐玻璃的声子平均自由路径：区分框架阳离子和非框架阳离子的有用参数

IF 1.8 4区材料科学

Isij International Pub Date : 2024-09-11 DOI: 10.2355/isijinternational.isijint-2024-141

Sohei Sukenaga, Bunta Ozato, Yohei Onodera, Shinji Kohara, Masahiro Shimizu, Tsuyoshi Nishi, Rie Endo, Takaaki Tomai, Akira Yoko, Sakiko Kawanishi, Hiroshi Fukaya, Hiromichi Ohta, Hiroyuki Shibata

{"title":"Phonon mean free path of silicate glasses: a useful parameter to distinguish between framework and nonframework cations","authors":"Sohei Sukenaga, Bunta Ozato, Yohei Onodera, Shinji Kohara, Masahiro Shimizu, Tsuyoshi Nishi, Rie Endo, Takaaki Tomai, Akira Yoko, Sakiko Kawanishi, Hiroshi Fukaya, Hiromichi Ohta, Hiroyuki Shibata","doi":"10.2355/isijinternational.isijint-2024-141","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-141","url":null,"abstract":"Assuming that heat is transported by lattice vibrations (phonons) in silicate glasses, their thermal conductivity is correlated with the product of sound velocity, volumetric heat capacity, and phonon mean free path (MFP). The sound velocity and heat capacity have been studied extensively, but the origin of the composition-induced variation in the MFP remains unclear. The present study investigated MFP in M2/nO–SiO2 (Mn+: Li+, Na+, Ca2+, Sr2+, or Pb2+) glasses with a variation of M2/nO content. The MFP of the silica glass decreased with the addition of M2/nO. The effect of the type of metallic cation on the MFP was minimal for the selected alkali and alkaline-earth silicate glasses. By contrast, the MFP of lead silicate glasses was higher than those of alkali or alkaline-earth silicate glasses when the metallic cation contents were comparable. Previous studies have demonstrated that alkali and alkaline-earth cations act as nonframework species that break the silicate network structure, whereas lead cations have inconclusive structural roles. Our data indicate that lead cations partly act as framework cations and that phonons tend to be scattered near nonframework cations in silicate glasses. Thus, the phonon MFP is a useful parameter for determining the structural role of metallic cations in silicate glass via phonon propagation.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216901","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 P Addition on the Corrosion Resistance of Steels Before and After Rust Formation 添加 P 对生锈前后钢材耐腐蚀性的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-09-03 DOI: 10.2355/isijinternational.isijint-2024-191

Chihiro Hayama, Mariko Kadowaki, Yoshiharu Murase, Hideki Katayama, Toru Hara, Yuka Hara, Hikari Watanabe, Isao Shitanda, Masayuki Itagaki

{"title":"Effect of P Addition on the Corrosion Resistance of Steels Before and After Rust Formation","authors":"Chihiro Hayama, Mariko Kadowaki, Yoshiharu Murase, Hideki Katayama, Toru Hara, Yuka Hara, Hikari Watanabe, Isao Shitanda, Masayuki Itagaki","doi":"10.2355/isijinternational.isijint-2024-191","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-191","url":null,"abstract":"This study investigates the effect of P addition on the corrosion resistance of steels before and after rust formation. Electrochemical measurements and surface analysis of P-containing steels (Fe-0.5 mass% P, Fe-1.0 mass% P, and Fe-1.5 mass% P) were conducted to analyze the contribution of P to their initial corrosion resistance before rust formation. The results showed that the initial corrosion resistance of the steel worsened with increasing P content. According to the surface analysis conducted by SEM/EDS, more P segregations at the grain boundaries occurred with higher P content. Polarization measurements indicated that these P segregations became initiation sites for localized corrosion, resulting in a decrease in the initial corrosion resistance.Although the initial corrosion resistance was worse with higher P content, the long-term corrosion resistance showed the inverse trend, improving with increasing P content. Atmospheric exposure tests at Miyakojima and surface analysis of the rust layers showed that P was incorporated into the rust layer, and it promoted the protective ability against corrosion.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216903","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 Exit Wear Length on the Behavior of Coherent Jet 出口磨损长度对相干射流行为的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-28 DOI: 10.2355/isijinternational.isijint-2024-153

Fuhai Liu, Bin Tong, Rong Zhu, Guangsheng Wei, Kai Dong

引用次数: 0

CO Reduction Process Technology and Development of Iron Ore Sintering Process CO 还原工艺技术与铁矿烧结工艺的开发

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-28 DOI: 10.2355/isijinternational.isijint-2023-318

Tingliang Zhong, Xiaohai Li, Xuefeng She, Yanjiang Wang, Peng Liu, Haibin Zuo, Qingguo Xue

{"title":"CO Reduction Process Technology and Development of Iron Ore Sintering Process","authors":"Tingliang Zhong, Xiaohai Li, Xuefeng She, Yanjiang Wang, Peng Liu, Haibin Zuo, Qingguo Xue","doi":"10.2355/isijinternational.isijint-2023-318","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-318","url":null,"abstract":"Iron ore sintering is a high-energy-consuming industry, and its high dependence on fossil fuels and the low concentration of CO in the sintering flue gas conceal the truth of the large total amount of CO emissions, which leads to the continuous emission of CO in the sintering flue gas has been harmful to the atmosphere and human health, and it is facing the great pressure of CO emission reduction. On the basis of commercially applied sintering technologies, the mechanism and characteristics of CO emission from sintering flue gas are discussed, and feasible ways to control CO emission in multiple aspects of source control, process emission reduction and end-of-pipe treatment are summarized. The core of source abatement is to reduce the fuel ratio, process abatement is to improve the combustion conditions of fuels to enhance the conversion rate of CO to CO2, and end-of-pipe treatment is to separate or oxidize CO to CO2 by physical or chemical means. hydrogen sintering technology is the future development direction for source abatement, steam blowing sintering technology is introduced for process control, and catalytic oxidation technology has great prospects for removing CO from flue gas in end-of-pipe treatment. CO has great prospects, but efforts are needed to develop highly active catalysts with anti-poisoning and long-standing stability. Finally, feasible technical routes for sintering flue gas CO reduction and their challenges are analyzed, and a coordinated multifaceted control of source-process-end sintering technologies is proposed to achieve the goal of high-efficiency sintering flue gas CO reduction.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216904","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 Al addition on thermal fatigue deformation morphology in high heat-resistant ferritic stainless steel SUS444 添加铝对高耐热铁素体不锈钢 SUS444 热疲劳变形形态的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-08-28 DOI: 10.2355/isijinternational.isijint-2024-194

Tetsuyuki Nakamura, Kyosuke Yoshimi

引用次数: 0

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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