Pub Date : 2023-06-01DOI: 10.2355/tetsutohagane.tetsu-2022-094
Tokinaga Namba, N. Okada
{"title":"Surrogate-based Shape Optimization of Immersion Nozzle in Continuous Casting","authors":"Tokinaga Namba, N. Okada","doi":"10.2355/tetsutohagane.tetsu-2022-094","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2022-094","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"34 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81702786","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}
Pub Date : 2023-06-01DOI: 10.2355/tetsutohagane.109.463
T. Hama
{"title":"Preface to the Special Issue “Cutting Edge of Applications of Data Science in Steels”","authors":"T. Hama","doi":"10.2355/tetsutohagane.109.463","DOIUrl":"https://doi.org/10.2355/tetsutohagane.109.463","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"30 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88831288","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}
Pub Date : 2023-06-01DOI: 10.2355/tetsutohagane.tetsu-2022-099
H. Mizuyama
{"title":"人の意思決定が埋め込まれた生産システムのモデル化と分析","authors":"H. Mizuyama","doi":"10.2355/tetsutohagane.tetsu-2022-099","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2022-099","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"15 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85217867","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}
Pub Date : 2023-05-15DOI: 10.2355/tetsutohagane.tetsu-2022-049
T. Matsuno, Nanami Kinoshita, Tomoko Matsuda, Yoshiaki Honda, T. Yasutomi
{"title":"Microvoid Formation of Ferrite-martensite Dual-phase Steel via Tensile Deformation after Severe Plastic Shear-deformation","authors":"T. Matsuno, Nanami Kinoshita, Tomoko Matsuda, Yoshiaki Honda, T. Yasutomi","doi":"10.2355/tetsutohagane.tetsu-2022-049","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2022-049","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"122 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78024856","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}
Pub Date : 2023-03-15DOI: 10.2355/tetsutohagane.tetsu-2021-045
Shun Tanaka, H. Shirahata, G. Shigesato, Manabu Takahashi
: The bainitic transformation kinetics and carbon enrichment of austenite during isothermal holding at 723–923 K were investigated for an Fe-0.1mass%C-0.5mass%Si-2.0mass%Mn alloy. The transformation progressed rapidly until approximately 50 s, after which transformation stasis was observed at 823 K. The carbon concentration of austenite increased as the transformation proceeded, and showed an almost constant value during stasis. It reached approximately 0.45-0.50% at 823 K, which corresponds to the carbon concentration at the T 0 ’ composition with an additional strain energy of 100 J/mol associated with the transformation. After stasis, a slight increase in the ferrite or bainitic ferrite fraction was observed. The carbon concentration of austenite also increased and reached approximately 0.60%, clearly exceeding the carbon concentration at the T 0 composition. These results imply that at the first stage, the bainite transformation occurs and shows the incomplete transformation, following which at the second stage, diffusional ferrite transformation proceeds. The additional strain energy associated with the transformation calculat-ed from the carbon concentration at stasis due to the incomplete bainite transformation tends to decrease as the holding temperature increases. This indicates that strain relaxation due to the transformation occurred at higher holding temperatures.
{"title":"Carbon Enrichment of Austenite during Ferrite-bainite Transformation in Low-alloy-steel","authors":"Shun Tanaka, H. Shirahata, G. Shigesato, Manabu Takahashi","doi":"10.2355/tetsutohagane.tetsu-2021-045","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-045","url":null,"abstract":": The bainitic transformation kinetics and carbon enrichment of austenite during isothermal holding at 723–923 K were investigated for an Fe-0.1mass%C-0.5mass%Si-2.0mass%Mn alloy. The transformation progressed rapidly until approximately 50 s, after which transformation stasis was observed at 823 K. The carbon concentration of austenite increased as the transformation proceeded, and showed an almost constant value during stasis. It reached approximately 0.45-0.50% at 823 K, which corresponds to the carbon concentration at the T 0 ’ composition with an additional strain energy of 100 J/mol associated with the transformation. After stasis, a slight increase in the ferrite or bainitic ferrite fraction was observed. The carbon concentration of austenite also increased and reached approximately 0.60%, clearly exceeding the carbon concentration at the T 0 composition. These results imply that at the first stage, the bainite transformation occurs and shows the incomplete transformation, following which at the second stage, diffusional ferrite transformation proceeds. The additional strain energy associated with the transformation calculat-ed from the carbon concentration at stasis due to the incomplete bainite transformation tends to decrease as the holding temperature increases. This indicates that strain relaxation due to the transformation occurred at higher holding temperatures.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"258 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76218458","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}
In order to recycle iron in steelmaking slag, a new process concerning mechanical separation of iron from slag, slag reduction at high temperature, and slag recycle after iron separation has been developed. In the mechanical separation, more than 90% of metallic iron was collected from steelmaking slag by improving methods of magnetic separation and gravity separation. In the slag reduction at high temperature, 92% of FetO in separated slag was reduced by heating the slag of basicity (%CaO/%SiO2) = 2.0 at 1 643 K with rotary kiln. In the slag recycle after iron separation, alkaline elution from the slag was decreased to less than one tenth by coating slag with chitosan. Moreover, cooling conditions for direct casting of molten slag to rock shape were investigated.
{"title":"Development of Iron Recovery Technique from Steelmaking Slag by Reduction at High Temperature","authors":"Kenji Nakase, Akitoshi Matsui, Nakai Yoshie, N. Kikuchi, Kishimoto Yasuo, Isshuu Tetsuyama","doi":"10.2355/tetsutohagane.tetsu-2021-027","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-027","url":null,"abstract":"In order to recycle iron in steelmaking slag, a new process concerning mechanical separation of iron from slag, slag reduction at high temperature, and slag recycle after iron separation has been developed. In the mechanical separation, more than 90% of metallic iron was collected from steelmaking slag by improving methods of magnetic separation and gravity separation. In the slag reduction at high temperature, 92% of FetO in separated slag was reduced by heating the slag of basicity (%CaO/%SiO2) = 2.0 at 1 643 K with rotary kiln. In the slag recycle after iron separation, alkaline elution from the slag was decreased to less than one tenth by coating slag with chitosan. Moreover, cooling conditions for direct casting of molten slag to rock shape were investigated.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88348232","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}
Pub Date : 2023-03-15DOI: 10.2355/tetsutohagane.tetsu-2021-073
K. Kanetani, K. Ushioda
: The changes in the state of carbon in tempered martensite and retained austenite in carburized SAE4320 steel under the rolling contact fatigue (RCF) were investigated using atom probe tomography (APT). In the tempered martensite, the carbons in solid solution and in carbon cluster were readily transferred to the preexisting metastable ( ε ) carbide due to rolling contact, resulting in a localized change from tempered martensite to ferrite accompanied by the growth of carbides. This supports the recently proposed dislocation assisted carbon migration theory. On the other hand, retained austenite with uniformly dis-tributed enriched solute carbon was partially transformed into the very fine deformation-induced martensite due to rolling contact. Furthermore, carbon seemed to be partitioned into retained austenite from the deformation-induced martensite during further rolling contact cycles. This is a new insight into the characteristics of deformation-induced martensite and retained austenite generated by rolling contact. The present study provides a plausible explanation to the phenomenon that the deformation-induced martensitic transformation improves the RCF life.
{"title":"Carbon Migration Behavior during Rolling Contact in Tempered Martensite and Retained Austenite of Carburized SAE4320 Steel","authors":"K. Kanetani, K. Ushioda","doi":"10.2355/tetsutohagane.tetsu-2021-073","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-073","url":null,"abstract":": The changes in the state of carbon in tempered martensite and retained austenite in carburized SAE4320 steel under the rolling contact fatigue (RCF) were investigated using atom probe tomography (APT). In the tempered martensite, the carbons in solid solution and in carbon cluster were readily transferred to the preexisting metastable ( ε ) carbide due to rolling contact, resulting in a localized change from tempered martensite to ferrite accompanied by the growth of carbides. This supports the recently proposed dislocation assisted carbon migration theory. On the other hand, retained austenite with uniformly dis-tributed enriched solute carbon was partially transformed into the very fine deformation-induced martensite due to rolling contact. Furthermore, carbon seemed to be partitioned into retained austenite from the deformation-induced martensite during further rolling contact cycles. This is a new insight into the characteristics of deformation-induced martensite and retained austenite generated by rolling contact. The present study provides a plausible explanation to the phenomenon that the deformation-induced martensitic transformation improves the RCF life.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"159 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87087111","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}
Pub Date : 2023-03-15DOI: 10.2355/tetsutohagane.tetsu-2021-039
Shuhei Irie, Kenji Tsuzumi, Akitoshi Matsui, N. Kikuchi
{"title":"Estimation of Changes in Content and Characteristics of Mold Flux during Continuous Casting","authors":"Shuhei Irie, Kenji Tsuzumi, Akitoshi Matsui, N. Kikuchi","doi":"10.2355/tetsutohagane.tetsu-2021-039","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-039","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"17 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82530797","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}
Pub Date : 2023-01-15DOI: 10.2355/tetsutohagane.tetsu-2022-023
Keisuke Ando, H. Ohtsubo, T. Tagawa
: The influence of pro-eutectoid cementite on fatigue crack growth behavior was investigated using various pearlitic steels containing from 0.64 to 1.21 mass%C. The fatigue crack growth rates of the hy-po-eutectoid and eutectoid pearlitic steels hardly changed, while that of the 1.21 mass%C steel having a large amount of pro-eutectoid cementite (θ) was accelerated especially in the high stress intensity factor region. Scanning electron microscope (SEM) observation revealed that fatigue fracture surface in the 1.21 mass%C steel more frequently contained islanded brittle fracture surfaces than that in other steels. In the 1.21 mass%C steel, the total area fraction of brittle fracture surface was notably increased with an en-hancement in maximum stress intensity factor ( K max ) due to crack extension. More detailed SEM fractog-raphies were performed comparing between before and after etching in order to identify microstructures beneath the brittle fracture appearances on the fatigue fracture surface of the 1.21 mass%C steel. As a re-sults, it was suggested that the pro-eutectoid θ was involved in the formation of brittle fracture. Based on these investigations, the accelerated fatigue crack growth behavior of hyper-eutectoid steel was discussed in terms of static brittle fracture induced by pro-eutectoid θ near the crack tip.
{"title":"Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels","authors":"Keisuke Ando, H. Ohtsubo, T. Tagawa","doi":"10.2355/tetsutohagane.tetsu-2022-023","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2022-023","url":null,"abstract":": The influence of pro-eutectoid cementite on fatigue crack growth behavior was investigated using various pearlitic steels containing from 0.64 to 1.21 mass%C. The fatigue crack growth rates of the hy-po-eutectoid and eutectoid pearlitic steels hardly changed, while that of the 1.21 mass%C steel having a large amount of pro-eutectoid cementite (θ) was accelerated especially in the high stress intensity factor region. Scanning electron microscope (SEM) observation revealed that fatigue fracture surface in the 1.21 mass%C steel more frequently contained islanded brittle fracture surfaces than that in other steels. In the 1.21 mass%C steel, the total area fraction of brittle fracture surface was notably increased with an en-hancement in maximum stress intensity factor ( K max ) due to crack extension. More detailed SEM fractog-raphies were performed comparing between before and after etching in order to identify microstructures beneath the brittle fracture appearances on the fatigue fracture surface of the 1.21 mass%C steel. As a re-sults, it was suggested that the pro-eutectoid θ was involved in the formation of brittle fracture. Based on these investigations, the accelerated fatigue crack growth behavior of hyper-eutectoid steel was discussed in terms of static brittle fracture induced by pro-eutectoid θ near the crack tip.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"52 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88896697","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}
Pub Date : 2023-01-15DOI: 10.2355/tetsutohagane.tetsu-2021-084
Toshihiro Shimizu, H. Ikuta, T. Kato, Toshiharu Tanaka, Nobuyuki Oyama, Mitsuki Asahina, Y. Hasumi, Yuki Nakamura
{"title":"Comparison of Fatigue Crack Propagation Behavior of Additive Manufactured Zero Thermal Expansion Alloy with Forged and Casted Materials","authors":"Toshihiro Shimizu, H. Ikuta, T. Kato, Toshiharu Tanaka, Nobuyuki Oyama, Mitsuki Asahina, Y. Hasumi, Yuki Nakamura","doi":"10.2355/tetsutohagane.tetsu-2021-084","DOIUrl":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-084","url":null,"abstract":"","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":"12 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79480701","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：