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Microstructure evaluation of an advanced high strength steel with superior results in terms of strength-ductility trade-off 一种高强钢的显微组织评价，在强度-塑性平衡方面取得了优异的成绩
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222617
T. B. Tavares, F. Costa, Marília Faria de Oliveira Caizer
{"title":"Microstructure evaluation of an advanced high strength steel with superior results in terms of strength-ductility trade-off","authors":"T. B. Tavares, F. Costa, Marília Faria de Oliveira Caizer","doi":"10.4322/2176-1523.20222617","DOIUrl":"https://doi.org/10.4322/2176-1523.20222617","url":null,"abstract":"Major improvements in new advanced high strength steels, especially related to microstructural features, have been made by the steel sector to access the trade-off between strength and ductility. In this context, the present study provides a detailed analysis of the microstructure of a cold rolled steel with a minimum tensile strength of 980 MPa, which possesses superior elongation when compared to other conceptions of steels from the same strength level. The annealing process was simulated in a Gleeble machine, and the microstructural characterization was done using optical and scanning electron microscopy, EBSD and XRD analysis. Austenite decomposition, using dilatometric test, and mechanical properties were also evaluated. The steel characterization revealed a microstructure consisting of ferrite matrix with martensite islands and retained austenite particles, in a fraction equivalent to that of conventional TRIP steels, dispersed throughout. The carbon content in the austenite, however, was less than 1.0% w/w, which results in a relatively low stability. Therefore, the increase in strain hardening capacity enabled by the deformation-induced transformation of austenite to martensite produces increased ductility during straining, distinguishing the analyzed material from other steels of the same strength level.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An investigation on galvanic corrosion in frictionstir-welded AA 5083 aluminum alloy 搅拌摩擦焊接AA 5083铝合金的电偶腐蚀研究
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222751
E. A. Duda, S. Soares, D. Buzzatti, G. Lemos, Tárique Hernandez Schneider, H. P. Cardoso, T. Falcade, A. Reguly
{"title":"An investigation on galvanic corrosion in frictionstir-welded AA 5083 aluminum alloy","authors":"E. A. Duda, S. Soares, D. Buzzatti, G. Lemos, Tárique Hernandez Schneider, H. P. Cardoso, T. Falcade, A. Reguly","doi":"10.4322/2176-1523.20222751","DOIUrl":"https://doi.org/10.4322/2176-1523.20222751","url":null,"abstract":"Friction-stir welding (FSW) is a well-known solid-state technology for manufacturing high-quality aluminum welds. However, corrosion may become an issue due to the changes in the microstructure within the stir zone, perhaps creating a local galvanic couple. In this work, AA 5083-O aluminum plates were joined by FSW, and corrosion analyzes were undertaken. Therefore, corrosion behavior was investigated using an immersion test, open circuit potential (OCP), and zero-resistance ammeter (ZRA) measurements. The stirred material was found to be more resistant to pitting nucleation than the AA5083-O alloy base material on immersion test and OCP analyzes. Nevertheless, deeper pits were more significant in the stirred material. The ZRA test showed similar results for both regions, indicating this system’s low galvanic couple effect.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical properties prediction of dual phase steels using machine learning 双相钢力学性能的机器学习预测
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222595
T. B. Tavares, F. P. Finamor, Julio Cezar de Sousa Zorzi
{"title":"Mechanical properties prediction of dual phase steels using machine learning","authors":"T. B. Tavares, F. P. Finamor, Julio Cezar de Sousa Zorzi","doi":"10.4322/2176-1523.20222595","DOIUrl":"https://doi.org/10.4322/2176-1523.20222595","url":null,"abstract":"The use of artificial intelligence techniques, with the increase of data generation capacity and the advancement of computational resources, has enabled the industries to develop and improve products without compromising laboratory and industrial resources. In this paper, a supervised machine learning (ML) based technique was used to predict the yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of dual phase steels with minimum tensile strengths of 590 and 780 MPa. The computational analysis was done from industrial data information containing the chemical composition and the thermomechanical processing parameters of the referred materials. The proposed ML model reached values of coefficient of determination above 0.94, with an accuracy of ±30 MPa for YS and UTS, and ±3% for EL. These results demonstrated the rationality and reliability of the tested method, allowing its application in future research works and in decision making that aim to optimize the steels industrial processing parameters.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fragility analysis under low temperature of steel alloy used in helicopter bolt 直升机螺栓用钢合金低温脆性分析
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222547
F. Schild, V. M. Costa, L. V. Biehl, P. H. C. P. Cunha
{"title":"Fragility analysis under low temperature of steel alloy used in helicopter bolt","authors":"F. Schild, V. M. Costa, L. V. Biehl, P. H. C. P. Cunha","doi":"10.4322/2176-1523.20222547","DOIUrl":"https://doi.org/10.4322/2176-1523.20222547","url":null,"abstract":"Steels parts used in helicopters are critical in terms of mechanical performance and safety issues where failure can lead to catastrophic consequences. The objective of this study was to evaluate the influence of low temperatures on toughness, through impact testing, on 45NiCrMo16 steel alloy used in the manufacture of bolts used on a helicopter rotor. The aircraft that the studied bolt is used can operate in the Antarctic environment. The temperatures used in the Charpy tests were -40 ºC, -20 ºC, 0 ºC, and 25 ºC. Besides, microstructural analysis (optical and scanning microscopy) and microhardness were done to identify the steel phases/microconstituents and any surface treatment presence. The results showed the presence of a hardened layer, a decrease in impact toughness with decreasing temperature, and a transition from ductile to brittle fracture. The conclusions indicate behavior that can restrict or limit this steel grade application in extreme temperature conditions, that is the ductile-brittle transition region begins from a decrease in temperature starting from -20 ºC.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simultaneous and sequential transformations with nucleation at preferred sites 同时和顺序转化，在首选位置成核
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222736
A. Alves, Felipe da Silva Siqueira, P. R. Rios
{"title":"Simultaneous and sequential transformations with nucleation at preferred sites","authors":"A. Alves, Felipe da Silva Siqueira, P. R. Rios","doi":"10.4322/2176-1523.20222736","DOIUrl":"https://doi.org/10.4322/2176-1523.20222736","url":null,"abstract":"The advent of new materials may increase transformations that involve two or more product phases. This transformation involving two or more product phases may occur simultaneously or sequentially. It is well-known that heterogeneous nucleation has advantages over homogeneous nucleation. Several sites may become preferred because they favor heterogeneous nucleation. The interface of precipitates and the grain boundaries are one of the preferred locations for nucleation. We model simultaneous and sequential transformations nucleated at the preferred sites. This work employs both computer simulation and exact analytical solutions. Two product phases, 1 and 2, were considered. The product phase 1 nucleated at the matrix/particle interface and the product phase 2 nucleated at the grain boundaries. The analytical model showed an excellent agreement with simulation data. For each case, computer simulation obtained the microstructural evolution. We discussed the effect of nucleation at the preferred sites on the microstructure.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Avaliação prática da efetividade da nodularização in mold e sua aplicação na definição da microestrutura e das características dos ferros fundidos nodulares 模具内球墨化的有效性及其在球墨铸铁组织和特性定义中的应用的实际评价
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222786
C. Santos, Elaine Carballo Siqueira Correa, J. Lima
{"title":"Avaliação prática da efetividade da nodularização in mold e sua aplicação na definição da microestrutura e das características dos ferros fundidos nodulares","authors":"C. Santos, Elaine Carballo Siqueira Correa, J. Lima","doi":"10.4322/2176-1523.20222786","DOIUrl":"https://doi.org/10.4322/2176-1523.20222786","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modelling non-ideal detonations in commercial explosives 模拟商业炸药的非理想爆炸
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222237
Paulo Couceiro, J. Miguel
{"title":"Modelling non-ideal detonations in commercial explosives","authors":"Paulo Couceiro, J. Miguel","doi":"10.4322/2176-1523.20222237","DOIUrl":"https://doi.org/10.4322/2176-1523.20222237","url":null,"abstract":"Highly non-ideal explosives usually react expressively below their ideal velocities of detonation. In these cases, dimensional effects and product heterogeneities become important to proper model their respective detonation state. Although Direct Numerical Simulation (DNS) techniques can provide a complete and exact solution for this problem, their actual computation cost are still not practical for industrial applications. In order to minimize these constrains, a simplified two-dimensional steady non-ideal detonation model for cylindrical stick explosives is presented. Based on an ellipsoidal shock shape approach (ESSA), the proposed model combines the quasi-one-dimensional theory for the axial flow solution with the unconfined sonic post-flow conditions at the edge of the explosive. Once calibrated, the model offers the possibility to predict the non-ideal detonation state for any charge diameter, resulting in a full mapping of the diameter-effect curve of the explosive. In addition, the effect of the inert confiner on the detonation flow is calculated by coupling a mechanistic confinement approach with the ESSA model. Thus, the proposed engineering approach is used to model the main properties of one of the most common ammonium nitrate-based explosive used in mining and quarrying industries, including the complete axial flow solution.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"120 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determinação da relação farinha/NaOH na gelatinização de depressores à luz da microscopia óptica e a sua influência nos testes de flotação mineral 光学显微镜下压榨机糊化过程中面粉/氢氧化钠比的测定及其对矿物浮选试验的影响
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222734
L. A. Silva, A. C. Silva, Elenice Maria Schons Silva, Luany Beatriz Amanajás de Oliveira
{"title":"Determinação da relação farinha/NaOH na gelatinização de depressores à luz da microscopia óptica e a sua influência nos testes de flotação mineral","authors":"L. A. Silva, A. C. Silva, Elenice Maria Schons Silva, Luany Beatriz Amanajás de Oliveira","doi":"10.4322/2176-1523.20222734","DOIUrl":"https://doi.org/10.4322/2176-1523.20222734","url":null,"abstract":"Starches are depressant reagents used in mineral flotation in order to confer selectivity to the process. For this, they need to be previously gelatinized, with the alkaline method being the most used technique in the mineral industry. In Brazil, NaOH is used as alkali and the flour/NaOH ratio is a parameter analyzed in this process. Although they are important, studies on this topic are scarce in the literature. That said, the work consisted in determining the ideal flour/ NaOH ratio for the gelatinization of depressants based on corn, sorghum and millet and in proving the effectiveness of the process under optical microscopy with polarized light. Subsequently, flotation tests with niobium ore using corn, millet and sorghum flours and their respective mixtures as depressants were carried out and the results were compared with industrial corn starch. The results showed that the new proposed depressants used smaller amounts of NaOH to be gelatinized in relation to corn starch. The optical microscopy stage confirmed the disruption of Maltese crosses for all flours, indicating complete gelatinization. The best pyrochlore depressant was sorghum flour and the results showed statistical similarity with corn starch.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
75th ABM Annual Congress 第75届ABM年会
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.202219spe02
André Silva
{"title":"75th ABM Annual Congress","authors":"André Silva","doi":"10.4322/2176-1523.202219spe02","DOIUrl":"https://doi.org/10.4322/2176-1523.202219spe02","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Análise do retorno elástico do aço ASTM A36 em processos de dobra em V em diferentes velocidades e raios de ferramental ASTM A36钢在不同工装速度和半径下V形弯曲过程中的回弹分析
Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222575
Rafael Menezes Nunes, Henrique André Heine
{"title":"Análise do retorno elástico do aço ASTM A36 em processos de dobra em V em diferentes velocidades e raios de ferramental","authors":"Rafael Menezes Nunes, Henrique André Heine","doi":"10.4322/2176-1523.20222575","DOIUrl":"https://doi.org/10.4322/2176-1523.20222575","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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