Isij International最新文献_第6页

Influence of MC Carbides on Pitting Corrosion Resistance of Weld Metal in Austenitic Stainless Steels MC 碳化物对奥氏体不锈钢焊接金属抗点蚀性的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-10 DOI: 10.2355/isijinternational.isijint-2024-067

Kota Kadoi, Yudai Kanno, So Aoki, Hiroshige Inoue

{"title":"Influence of MC Carbides on Pitting Corrosion Resistance of Weld Metal in Austenitic Stainless Steels","authors":"Kota Kadoi, Yudai Kanno, So Aoki, Hiroshige Inoue","doi":"10.2355/isijinternational.isijint-2024-067","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-067","url":null,"abstract":"The influence of MC-type carbide formation on pitting corrosion resistance in weld metal of austenitic stainless steel was investigated. The relationship between the microstructure such as carbides and element distribution, and pitting corrosion resistance of the simulated weld metal of austenitic stainless steel was studied. The addition of molybdenum improved the pitting corrosion resistance. The effect of niobium addition on the pitting resistance was negligible. However, the addition of titanium significantly reduced the pitting corrosion resistance. The addition of niobium or titanium induced the formation of MC-type carbides, such as TiC and NbC, at the cellular boundaries. The pits were mainly initiated near or at carbides. The chromium depletion zone was formed near M23C6 coexisting with TiC only in the specimen added titanium. Thus, TiC formed during solidification accelerated the chromium diffusion-associated M23C6 precipitation on TiC. The depletion zone deteriorated the pitting corrosion resistance of the titanium-containing specimen.\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":"141515125","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

Influence of Fine Precipitates on Primary Recrystallization Mechanism and Texture Formation in Cold Rolled Fe-3%Si Alloy with Initial Coarse Goss Grains 细小沉淀物对冷轧铁-3%硅合金中初始粗晶粒的初级再结晶机制和纹理形成的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-10 DOI: 10.2355/isijinternational.isijint-2024-043

Nobusato Morishige, Kenichi Murakami, Kohsaku Ushioda

{"title":"Influence of Fine Precipitates on Primary Recrystallization Mechanism and Texture Formation in Cold Rolled Fe-3%Si Alloy with Initial Coarse Goss Grains","authors":"Nobusato Morishige, Kenichi Murakami, Kohsaku Ushioda","doi":"10.2355/isijinternational.isijint-2024-043","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-043","url":null,"abstract":"Controlling the primary recrystallization texture is important to improve the magnetic properties of grain-oriented electrical steel through secondary recrystallization. To understand the factors influencing fine precipitates on the primary recrystallization mechanism and texture formation, changes in the recrystallization behaviors with states of precipitates (extremely fine, and coarse) were investigated through cold rolling, pre-annealing, and primary recrystallization annealing in Fe-3%Si alloy with initial coarse Goss ({110}<001>) grains using EBSD and TEM. Extremely fine MnS precipitated during the recovery stage had significant effects on the suppression of further recovery and recrystallization, especially after pre-annealing at 550 °C. Recrystallized Goss grains were observed after primary recrystallization annealing by nucleation and growth irrespective of the states of precipitates; however, in the steel with extremely fine precipitates, {111}<112> grains remained through primary recrystallization annealing. It is assumed that fine precipitates would inhibit the growth of Goss grains and keep {111}<112> orientation, the main orientation in the cold rolled sheet, which would indicate occurrence of continuous recrystallization.\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":"141529638","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 Furnace Lining Structure on the Flow Field in the 35t Top-blowing Converter Steelmaking Process 炉衬结构对 35t 顶吹转炉炼钢过程流场的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-05 DOI: 10.2355/isijinternational.isijint-2023-468

Fuhai Liu, Run Mou, Rong Zhu, Chen Sun, Kai Dong, Guangsheng Wei, Xing Du, Yu Chen

{"title":"Effect of Furnace Lining Structure on the Flow Field in the 35t Top-blowing Converter Steelmaking Process","authors":"Fuhai Liu, Run Mou, Rong Zhu, Chen Sun, Kai Dong, Guangsheng Wei, Xing Du, Yu Chen","doi":"10.2355/isijinternational.isijint-2023-468","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-468","url":null,"abstract":"The main function of the converter furnace lining was to provide a durable container for the high-temperature molten bath. During the steelmaking process, the occurrence of melting corrosion led to the destruction of the furnace lining structure and a subsequent change in the shape of the furnace. Hence, the dynamic condition of the molten bath was altered. In this paper, both water experiment and numerical simulation have been adopted to analyze the flow field characteristic of molten bath by various oxygen lance parameters, in both the initial and late stages of the furnace lining structure of a top-blowing converter. The results revealed the late furnace lining structure improved the average velocity of the molten bath, thereby reducing the mixing time and volume of the low-velocity dead zone, comparing with the furnace lining structure. In the late furnace lining structure, the larger furnace diameter expanded the impaction area of the molten bath, resulting in an enhanced contact area between the liquid slag and the molten steel. Consequently, the FeO in the liquid slag rapidly reacted with the C element in the molten steel, leading to a decrease in the fluidity of the liquid slag and a decline in dephosphorization efficiency. Based on the results generated by water experiment and numerical simulation, two types of new oxygen lances were investigated in the industrial application research. Subsequently, it was determined that the new oxygen lance with an inclination angle of 12.3° was deemed suitable for the 35t top-blowing converter.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259987","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

Formation behavior of Fe–Zn intermetallic layers at the interface between Fe–Mn and pure Zn melt at 460°C 460°C 时铁-锰和纯锌熔体界面上铁-锌金属间层的形成行为

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-05 DOI: 10.2355/isijinternational.isijint-2024-096

Suzue Yoneda, Naoki Takata

{"title":"Formation behavior of Fe–Zn intermetallic layers at the interface between Fe–Mn and pure Zn melt at 460°C","authors":"Suzue Yoneda, Naoki Takata","doi":"10.2355/isijinternational.isijint-2024-096","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-096","url":null,"abstract":"The effect of Mn on the alloying reaction during hot-dip galvanization was investigated. The microstructure of the Fe–Zn intermetallic layers consisted of ζ, δ, and Γ phases for both pure Fe and Fe–2Mn (wt.%) alloy. The intermetallic layers grew thicker with increasing dipping time, and the growth rate of each layer was similar for both substrates. In the case of Fe–2Mn, the formation of the δ1p phase was observed after dipping for 2 s. However, δ1p formation was delayed for pure Fe, indicating that Mn may promote nucleation of the δ1p phase. It is known that the δ1p phase nucleates in the Fe-saturated ζ phase. The Fe content at the ζ/δ1p interface was found to be lower for the Fe–2Mn alloy by electron probe microanalysis, suggesting that the supersaturation of Fe for the nucleation of δ1p is decreased by Mn addition and Mn may stabilize the δ1p phase. Once δ1p became a continuous layer, the growth rates of the δ1p layer on pure Fe and Fe–2Mn were similar. Mn could affect only the nucleation of δ1p during the initial stage of the alloying reaction.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141258570","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 cooling rate on the inclusion precipitation behavior in unidirectionally solidified Fe-Mn-C-Al TWIP alloys 冷却速度对单向凝固的 Fe-Mn-C-Al TWIP 合金中夹杂物析出行为的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-03 DOI: 10.2355/isijinternational.isijint-2024-084

Yuewen Fan, Xiaojun Hu, Hiroyuki Matsuura

{"title":"Effect of cooling rate on the inclusion precipitation behavior in unidirectionally solidified Fe-Mn-C-Al TWIP alloys","authors":"Yuewen Fan, Xiaojun Hu, Hiroyuki Matsuura","doi":"10.2355/isijinternational.isijint-2024-084","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-084","url":null,"abstract":"During the solidification process, the precipitation of inclusions is inevitable due to micro-segregation, especially AlN and MnS in TWIP steel. In order to reasonably control the precipitation of inclusion, the cooling rate as an important factor in the casting process was studied through the unidirectional solidification experiments. The combined analyses using ASEM-EDS, EPMA and optical microscope revealed that the number density of precipitated inclusion decreased along the solidification direction with the decrease of the solid fraction. The number density of Al2O3, which existed in the liquid alloy was basically stable. On the contrary, the number density of MnS decreased and that of AlN increased with the increasing of cooling rate. Moreover, in the early stage of the solidification (fs<0.1), the order of Al concentration curve slope was 0.58 K/s >0.38 K/s >0.1 K/s due to the entrapment of precipitated AlN by the solid-liquid interface moving relatively fast. Temperature was the main factor to affect the AlN precipitation and the particles were precipitated at the early stage of the solidification process. AlN inclusions can become the core to form the composite particles and have the positive effect on fining grains.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141258740","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

Evaluation of Wettability at Interface between Molten Slag and Liquid Fe on Recovery of Metallic Fe from Lunar Regolith 评估熔融矿渣与液态铁之间界面的润湿性对从月球岩石中回收金属铁的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-03 DOI: 10.2355/isijinternational.isijint-2024-075

Sunglock Lim, Masayuki Ieuji, Masashi Nakamoto, Kiyoshi Fuji-ta, Takeshi Yoshikawa, Toshihiro Tanaka

引用次数: 0

Formation of Primary Slag and Carburizing Behavior of Metal Iron in Cohesive Zone of Hydrogen-rich Blast Furnace 富氢高炉凝聚区一次渣的形成和金属铁的渗碳行为

IF 1.8 4区材料科学

Isij International Pub Date : 2024-06-03 DOI: 10.2355/isijinternational.isijint-2023-477

Yana Qie, Duanyan Shangguan, Yuzhuang Li, Xindong Wang, Qing Lyu, Xiaoai Wang

{"title":"Formation of Primary Slag and Carburizing Behavior of Metal Iron in Cohesive Zone of Hydrogen-rich Blast Furnace","authors":"Yana Qie, Duanyan Shangguan, Yuzhuang Li, Xindong Wang, Qing Lyu, Xiaoai Wang","doi":"10.2355/isijinternational.isijint-2023-477","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2023-477","url":null,"abstract":"To obtain the formation characteristics of melting slag-iron in cohesive zone of hydrogen rich blast furnace (BF), the phase composition of primary slag, the variation of slag amount and the mechanism of metal iron carburizing under different atmosphere conditions were analyzed. The results showed that: The hydrogen-rich operation in BF changes the formation of primary slag and the carburizing behavior of metal iron in the cohesive zone. After hydrogen enrichment in gas, the amount of primary slag decreases. The wustite decreases, however, the primary slag absorbs CaO and Al2O3 to form the monticellite, hortonolite and magnesium rosaceite. With the increase of hydrogen enrichment ratio φ(H2), the high melting point material (2CaO·SiO2) began to crystallize out, and the melting point of primary slag gradually increase, coupled with the substantial reduction of slag content, which may lead to the \"Drying\" phenomenon of primary slag in hydrogen-rich blast furnace. The hydrogen-rich operation of blast furnace changes the contact mode between the iron charge and coke from surface contact to point contact in the cohesive zone, which reduces the carburizing rate of metal iron in cohesive zone so that the content of [C] and [S] in the dripping molten iron decreases accordingly. The formation of high melting point material in the primary slag and the blockage of the carburizing process of metal iron lead to the increase of the droplet temperature of slag-iron, which makes the blast furnace's cohesive zone move down and thinner.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259680","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

Three-Dimensional Evaluation of Internal Structure of Coke Made by Blending Non-coking Coal Using X-ray Computed Tomography 利用 X 射线计算机断层扫描技术对非炼焦煤混合制成的焦炭内部结构进行三维评估

IF 1.8 4区材料科学

Isij International Pub Date : 2024-05-30 DOI: 10.2355/isijinternational.isijint-2024-027

Yoshiya Matsukawa, Yusuke Nakamura, Daisuke Igawa, Takashi Matsui, Hideyuki Aoki

{"title":"Three-Dimensional Evaluation of Internal Structure of Coke Made by Blending Non-coking Coal Using X-ray Computed Tomography","authors":"Yoshiya Matsukawa, Yusuke Nakamura, Daisuke Igawa, Takashi Matsui, Hideyuki Aoki","doi":"10.2355/isijinternational.isijint-2024-027","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-027","url":null,"abstract":"Image analysis was performed on the analytical objects constructed by X-ray computed tomography images of coke with anthracite as low swelling and softening-melting coal to evaluate the pore structure three-dimensionally. The sphericity of the pores was calculated based on the volume and surface area of the pores. Tracers were inserted into all anthracite particles to distinguish coke matrices derived from anthracite from those derived from coking coal. This is the first success in identifying coke matrices derived from coking coal and those derived from other carbon source. The sphericity of pores in the surrounding area of the coke matrix derived from anthracite and the area without coke matrix derived from anthracite was extracted from the analytical object. The surrounding area of the coke matrix derived from anthracite contained more low-sphericity pores compared to the area without coke matrix derived from anthracite. This may be due to the free expansion of the coking coal in the surrounding area of the anthracite since the anthracite does not soften or expand during carbonization. The coking coal expanded excessively to fill the voids between the particles, resulting in the bubbles bursting and generating connected pores.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141188905","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

Evaluation of fatigue crack initiation and propagation properties of structural steels with different cyclic softening behavior based on local strain 基于局部应变评估具有不同循环软化行为的结构钢的疲劳裂纹萌发和扩展特性

IF 1.8 4区材料科学

Isij International Pub Date : 2024-05-29 DOI: 10.2355/isijinternational.isijint-2024-124

Takayuki Yonezawa, Pengjun Luo, Seiichiro Tsutsumi

{"title":"Evaluation of fatigue crack initiation and propagation properties of structural steels with different cyclic softening behavior based on local strain","authors":"Takayuki Yonezawa, Pengjun Luo, Seiichiro Tsutsumi","doi":"10.2355/isijinternational.isijint-2024-124","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-124","url":null,"abstract":"In this paper, fatigue crack initiation and propagation properties of three structural steels with different static strength and cyclic softening behavior were evaluated and compared with the estimation results based on the local strain response. Steel C had the highest cyclic softening rate, which was 10 times that of steel A and twice that of steel B. The relationship between strain range and fatigue life in the fatigue life region shorter than 10^5 cycles was almost the same regardless of the test steels. The fatigue crack initiation life from the notch bottom of the SENT specimen was almost the same independent of static strength and cyclic softening rate. The crack initiation life estimated from the Strain range versus fatigue life equation using the local strain response measured by DIC was roughly in agreement with the experimental results. Steel C had the highest crack opening load and the slowest fatigue crack propagation rate compared to the other two steels. The local strain range at the fatigue crack tip showed a good correlation with the fatigue crack propagation rate irrespective of the steel grade. In addition, the estimates of fatigue crack propagation rate based on the local strain response were in almost agreement with the experimental results.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189147","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

Influence of silicon and tramp elements on the high-temperature oxidation of steel in direct casting and rolling processes 硅和杂散元素对直接铸造和轧制过程中钢的高温氧化的影响

IF 1.8 4区材料科学

Isij International Pub Date : 2024-05-27 DOI: 10.2355/isijinternational.isijint-2024-072

Georg Gaiser, Peter Presoly, Christian Bernhard, Kerstin Baumgartner, Simon Grosseiber

{"title":"Influence of silicon and tramp elements on the high-temperature oxidation of steel in direct casting and rolling processes","authors":"Georg Gaiser, Peter Presoly, Christian Bernhard, Kerstin Baumgartner, Simon Grosseiber","doi":"10.2355/isijinternational.isijint-2024-072","DOIUrl":"https://doi.org/10.2355/isijinternational.isijint-2024-072","url":null,"abstract":"Oxidation processes are unavoidable in continuous casting and further hot processing of steel. A deeper understanding of the occurring phenomena such as intergranular oxidation and liquid metal infiltration of grain boundaries is essential to continuously improve the quality of the products. In this study, oxidation experiments were performed with simultaneous thermal analysis for two thin slab casting and rolling applications under near-process conditions up to the point prior to the first reduction stage. The experiments were performed for two low-carbon steels contaminated with undesirable tramp elements (Cu, Sn, …). In addition, the two steels contain Silicon at different levels. The results show that for the \"Endless Strip Production\" process (ESP), intergranular oxidation is significantly less pronounced compared to a \"Thin Slab Casting and Rolling process\" with a gas-fired tunnel furnace (TSCR TF). Due to the short process time at high temperatures in the ESP process, hardly any liquid metal infiltration by copper appears. In low silicon steel, intergranular oxidation results from various oxides, and liquid metal infiltration appears simultaneously in the TSCR TF process. Furthermore, the yield loss from oxidation is significantly higher in the TSCR TF process. The change from a natural gas combustion atmosphere to a hydrogen combustion atmosphere further increases the oxidation rate and results in a higher mass loss.\u0000","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171029","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