Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20212522
Carlos Eduardo Bruxel, Sandra Raquel Kunst, Luã Tainachi Mueller, Fernando Dal Pont Morisso, C. Carone, C. T. Oliveira
{"title":"Uso de resíduos de tinta em pó de pintura eletrostática para fabricação de revestimentos para piso","authors":"Carlos Eduardo Bruxel, Sandra Raquel Kunst, Luã Tainachi Mueller, Fernando Dal Pont Morisso, C. Carone, C. T. Oliveira","doi":"10.4322/2176-1523.20212522","DOIUrl":"https://doi.org/10.4322/2176-1523.20212522","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525771","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}
Zinc oxide (ZnO) is a broad bandgap semiconductor (3.37 eV) with a wide range of applications, such as catalysts, piezoelectric actuators and transducers, solar cells, microsensors, among others. One way of obtaining ZnO is through the controlled oxidation of metallic zinc, which is the third most consumed metal in the world among the non-ferrous metals with the galvanizing industry being responsible for approximately 57% of the worldwide consumption of this metal. Anodizing is a process of surface treatment consisting of creating an oxide film on the metal surface, being able to retain large amounts of dye. ZnO was obtained by anodizing the galvanized steel which was carried out in a 5mM NaHCO3 electrolytic solution at a constant voltage of 35V with an initial current of 0.2A for 8 minutes. Chemical characterization of the anodized surface, thickness of the layer and verification of the morphology obtained were verified, where it was verified the production of na-nofios with about 100nm of diameter. N479 Black Dye commercial dye was deposited. The results showed the obtaining of a homogeneous layer, with the morphology of nanowires with great layer-city of dye absorption.
{"title":"Crescimento de filme de ZnO nanoestruturado por anodização de aço galvanizado","authors":"Henrique Gonçalves Pereira, Rubens Camaratta, Cristiane Wienke Raubach Ratmann, Naiane Paiva Stochero","doi":"10.4322/2176-1523.20222141","DOIUrl":"https://doi.org/10.4322/2176-1523.20222141","url":null,"abstract":"Zinc oxide (ZnO) is a broad bandgap semiconductor (3.37 eV) with a wide range of applications, such as catalysts, piezoelectric actuators and transducers, solar cells, microsensors, among others. One way of obtaining ZnO is through the controlled oxidation of metallic zinc, which is the third most consumed metal in the world among the non-ferrous metals with the galvanizing industry being responsible for approximately 57% of the worldwide consumption of this metal. Anodizing is a process of surface treatment consisting of creating an oxide film on the metal surface, being able to retain large amounts of dye. ZnO was obtained by anodizing the galvanized steel which was carried out in a 5mM NaHCO3 electrolytic solution at a constant voltage of 35V with an initial current of 0.2A for 8 minutes. Chemical characterization of the anodized surface, thickness of the layer and verification of the morphology obtained were verified, where it was verified the production of na-nofios with about 100nm of diameter. N479 Black Dye commercial dye was deposited. The results showed the obtaining of a homogeneous layer, with the morphology of nanowires with great layer-city of dye absorption.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525946","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222423
D. Rodrigues, Francisco Yastami Nakamoto, G. Santos, F. Miranda, G. Batalha, L. Fernandes
{"title":"Carbonetos de WC com fase ligante Co-Ni, comportamento da dureza e resistência à ruptura transversal em função da adição de SiC-± e seus efeitos na temperatura de sinterização","authors":"D. Rodrigues, Francisco Yastami Nakamoto, G. Santos, F. Miranda, G. Batalha, L. Fernandes","doi":"10.4322/2176-1523.20222423","DOIUrl":"https://doi.org/10.4322/2176-1523.20222423","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526118","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222397
Abel Eduardo Netto, Almir Turazi
One way to increase the useful life of low carbon steels is the application, through welding, of surface coatings with specific chemical compositions in the desired region of the sample. As it is a fusion welding process, microstructural changes occur in the material and must be considered. This work aims to evaluate the effects of the chemical composition of the coating and the type of electrical current on the mechanical properties of low carbon steels after application of chrome-based coatings (DIN E10-UM-60GR and E6-UM-60G). For hardfacing, the SMAW process was used, with the making of overlapping strands laterally. Abrasive wear and Vickers hardness tests were performed and, after analyzing the results, it was observed that the E10-UM-60GR electrode (with higher C and Cr contents) obtained superior performance, suffering less abrasive wear and obtaining an average hardness bigger. The use of the E6-UM-60G electrode generated strands with a lower degree of dilution and greater influence on the properties of the HAZ (heat-affected zone).
{"title":"Estudo dos efeitos da aplicação de revestimentos duros em aço baixo carbono através do processo de soldagem SMAW","authors":"Abel Eduardo Netto, Almir Turazi","doi":"10.4322/2176-1523.20222397","DOIUrl":"https://doi.org/10.4322/2176-1523.20222397","url":null,"abstract":"One way to increase the useful life of low carbon steels is the application, through welding, of surface coatings with specific chemical compositions in the desired region of the sample. As it is a fusion welding process, microstructural changes occur in the material and must be considered. This work aims to evaluate the effects of the chemical composition of the coating and the type of electrical current on the mechanical properties of low carbon steels after application of chrome-based coatings (DIN E10-UM-60GR and E6-UM-60G). For hardfacing, the SMAW process was used, with the making of overlapping strands laterally. Abrasive wear and Vickers hardness tests were performed and, after analyzing the results, it was observed that the E10-UM-60GR electrode (with higher C and Cr contents) obtained superior performance, suffering less abrasive wear and obtaining an average hardness bigger. The use of the E6-UM-60G electrode generated strands with a lower degree of dilution and greater influence on the properties of the HAZ (heat-affected zone).","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526529","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222416
Mônia Aline Hunger Geiger, Luã Tainachi Mueller, Fernando Dal Pont Morisso, Sandra Raquel Kunst, C. Carone, C. T. Oliveira
The galvanic process has a high degree of pollution due to the amount of effluents generated and the toxicity of the chemicals used in the process. You know if hexavalent chromium is known as a carcinogen and the associated residues are dangerous and difficult to use. In view of this, the development of new technologies has been used to use corrosion resistant, environmentally friendly and economically viable processes. An alternative technology that can meet this need is PVD physical vapor deposition, with a spray process. In this context, this study aims to evaluate and compare the performance of aluminum coatings applied by sputtering with varnish in relation to the performance of the electrodeposited chrome coating. For that, the coatings were applied in zamak and were characterized morphologically and electrochemically. The results shown when the aluminum finishes deposited by spraying show equivalent characteristics both in electrochemical performance and in morphological tests when compared to the chrome plating in the conventional process (electroplating), being an alternative of substitution with sustainable use.
{"title":"Análise do processo de sputtering como alternativa ao processo galvânico","authors":"Mônia Aline Hunger Geiger, Luã Tainachi Mueller, Fernando Dal Pont Morisso, Sandra Raquel Kunst, C. Carone, C. T. Oliveira","doi":"10.4322/2176-1523.20222416","DOIUrl":"https://doi.org/10.4322/2176-1523.20222416","url":null,"abstract":"The galvanic process has a high degree of pollution due to the amount of effluents generated and the toxicity of the chemicals used in the process. You know if hexavalent chromium is known as a carcinogen and the associated residues are dangerous and difficult to use. In view of this, the development of new technologies has been used to use corrosion resistant, environmentally friendly and economically viable processes. An alternative technology that can meet this need is PVD physical vapor deposition, with a spray process. In this context, this study aims to evaluate and compare the performance of aluminum coatings applied by sputtering with varnish in relation to the performance of the electrodeposited chrome coating. For that, the coatings were applied in zamak and were characterized morphologically and electrochemically. The results shown when the aluminum finishes deposited by spraying show equivalent characteristics both in electrochemical performance and in morphological tests when compared to the chrome plating in the conventional process (electroplating), being an alternative of substitution with sustainable use.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526578","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222675
Mariana M. Gonçalves Santos, Luiz Rogério Pinho de Andrade Lima
The Angico dos Dias carbonate phosphate rock deposit has been exploited and treated in a dry processing plant that includes classification and low, medium and high intensity magnetic concentration. The non-magnetic fraction is used in the production of fertilizers and the fines and magnetic fractions are discarded as tailings. Previous studies indicate the relevant presence of light rare-earth elements and low concentrations of thorium and uranium in the ore. The objective of this work was to characterize the ore, the concentrate and the magnetic tailings of the plant. The results of chemical and mineralogical analyzes indicate that the ore, the product and the tailings are rich in calcium, phosphorus, iron, silicon, aluminum and magnesium. The total content of rare earths is greater than 9 g/kg in the ore and 6 g/kg in the magnetic tailings. The main constituents of the ore are: fluorapatite, hydrobiotite and vermiculite. More detailed analyzes show that cerium, lanthanum, neodymium and samarium are present in the structure of apatite and in monazite particles. Cerium is also found in another mineral without association with other rare earth elements. The results also indicate that the fertilizer production process, with acid attack, promotes the leaching of a significant portion of light rare earth elements contained in apatite and cerianite, which may allow their recovery without significant additional costs.
Angico dos Dias碳酸盐岩磷矿在干法选矿厂进行了开采和处理，包括分级和低、中、强磁富集。非磁性部分用于生产肥料，细粒和磁性部分作为尾矿丢弃。先前的研究表明，该矿石中存在轻稀土元素和低浓度的钍和铀。本工作的目的是表征该工厂的矿石、精矿和磁性尾矿。化学和矿物学分析结果表明，矿石、产品和尾矿中均含有丰富的钙、磷、铁、硅、铝和镁。矿石中稀土总含量大于9 g/kg，磁性尾矿中稀土总含量大于6 g/kg。矿石的主要成分为:氟磷灰石、水黑云母和蛭石。更详细的分析表明，铈、镧、钕和钐存在于磷灰石和独居石颗粒的结构中。铈也存在于另一种不与其他稀土元素结合的矿物中。结果还表明，有酸侵蚀的肥料生产过程促进了磷灰石和铈矿中含有的相当一部分轻稀土元素的浸出，这可能使它们的回收没有显著的额外成本。
{"title":"Caracterização da rocha fosfática de Angico dos Dias (Bahia) e identificação dos minerais portadores de terras raras","authors":"Mariana M. Gonçalves Santos, Luiz Rogério Pinho de Andrade Lima","doi":"10.4322/2176-1523.20222675","DOIUrl":"https://doi.org/10.4322/2176-1523.20222675","url":null,"abstract":"The Angico dos Dias carbonate phosphate rock deposit has been exploited and treated in a dry processing plant that includes classification and low, medium and high intensity magnetic concentration. The non-magnetic fraction is used in the production of fertilizers and the fines and magnetic fractions are discarded as tailings. Previous studies indicate the relevant presence of light rare-earth elements and low concentrations of thorium and uranium in the ore. The objective of this work was to characterize the ore, the concentrate and the magnetic tailings of the plant. The results of chemical and mineralogical analyzes indicate that the ore, the product and the tailings are rich in calcium, phosphorus, iron, silicon, aluminum and magnesium. The total content of rare earths is greater than 9 g/kg in the ore and 6 g/kg in the magnetic tailings. The main constituents of the ore are: fluorapatite, hydrobiotite and vermiculite. More detailed analyzes show that cerium, lanthanum, neodymium and samarium are present in the structure of apatite and in monazite particles. Cerium is also found in another mineral without association with other rare earth elements. The results also indicate that the fertilizer production process, with acid attack, promotes the leaching of a significant portion of light rare earth elements contained in apatite and cerianite, which may allow their recovery without significant additional costs.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526857","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222677
J. Mata, Alizeibek Saleimen Nader, D. Mazzinghy
In mining projects, it is necessary to have a wide knowledge of the main variables of the mineral deposit before strategic mine planning takes effect. In the meantime, the application of geometallurgy has allowed the modeling of parameters related to the lithologies present in the deposit, such as the specific energy in comminution. This work intends to carry out a mine planning case study with the Direct Block Scheduling (DBS) methodology implemented in the MiningMath software and using the Marvin block model. The results indicate that the processing time of each block required more complex decision-making from the DBS algorithm to fulfill the objectives of mine planning. It is also noticed that the algorithms prioritize the extraction of blocks more released in the first years of the mine, anticipating profits and leaving, for the second half of the life of the project, the intensification of development, aiming to release more blocks for mining.
{"title":"Inclusion of the geometallurgical variable specific energy in the mine planning using direct block scheduling","authors":"J. Mata, Alizeibek Saleimen Nader, D. Mazzinghy","doi":"10.4322/2176-1523.20222677","DOIUrl":"https://doi.org/10.4322/2176-1523.20222677","url":null,"abstract":"In mining projects, it is necessary to have a wide knowledge of the main variables of the mineral deposit before strategic mine planning takes effect. In the meantime, the application of geometallurgy has allowed the modeling of parameters related to the lithologies present in the deposit, such as the specific energy in comminution. This work intends to carry out a mine planning case study with the Direct Block Scheduling (DBS) methodology implemented in the MiningMath software and using the Marvin block model. The results indicate that the processing time of each block required more complex decision-making from the DBS algorithm to fulfill the objectives of mine planning. It is also noticed that the algorithms prioritize the extraction of blocks more released in the first years of the mine, anticipating profits and leaving, for the second half of the life of the project, the intensification of development, aiming to release more blocks for mining.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526919","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222637
Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima
Brazil has the second largest reserve of monazite, which is one of the three main minerals bearing of rare earth elements. In this study, a monazite concentrate, derived from the occurrence of heavy minerals in the coastal strips of the states of Bahia and Espírito Santos, was used. The best way to analyze aqueous solutions rich in rare earths by ICP-OES was also evaluated. In this work, the steps used to obtain an aqueous solution rich in rare earths from the monazite concentrate involved the following steps: addition of NaOH to the concentrate, heating at 400 ºC for 3 hours, washing with water and subsequent leaching of the remaining solid phase with HCl. Chemical and mineralogical characterizations were accomplished on the products of this process and the results indicated that the initial concentrate is rich in light rare earths, the alkaline fusion product is predominantly composed of rare earth hydroxides and free of NaOH. The acid leaching tailings showed to be rich in zirconite, indicating that the dissolution of the rare earth hydroxides formed in the previous step was complete. Spectral interferences in the lines of the predominant elements were considered in the ICP-OES analysis using individual patterns of these elements. The following lines were defined for the predominant elements: Ce 456.236 nm, Th 283.730 nm, La 384.902 nm, Nd 430.058 nm, Pr 390.844 nm, and Sm 428,079 nm. The leachate obtained after acid leaching of rare earth hydroxides was analyzed by this method and the concentrations of the predominant elements (in g/L) were: Ce 32.81, Th 14.76, La 8.58, Nd 3.35, Pr 3.02, and Sm 1.28
独居石是三种主要含稀土元素的矿物之一，巴西的独居石储量居世界第二位。在这项研究中，使用了一种从巴伊亚州和Espírito桑托斯州沿海地带的重矿物中提取的独居石精矿。对ICP-OES分析富稀土水溶液的最佳方法进行了评价。在这项工作中，从独居石精矿中获得富含稀土的水溶液的步骤包括以下步骤:向精矿中加入NaOH，在400℃下加热3小时，用水洗涤，随后用HCl浸出剩余的固相。对该工艺产物进行了化学和矿物学表征，结果表明:初始精矿富含轻稀土，碱性熔融产物以稀土氢氧化物为主，不含NaOH。酸浸尾矿中锆英石含量丰富，说明前一步形成的稀土氢氧化物溶解完成。在ICP-OES分析中，利用这些元素的单个模式考虑了主要元素谱线的光谱干扰。主要元素为Ce 456.236 nm, Th 283.730 nm, La 384.902 nm, Nd 430.058 nm, Pr 390.844 nm, Sm 428,079 nm。对稀土氢氧化物酸浸后的渗滤液进行了分析，其优势元素浓度(g/L)为:Ce 32.81, Th 14.76, La 8.58, Nd 3.35, Pr 3.02, Sm 1.28
{"title":"Tratamento térmico para desfosfatização de monazita e recuperação dos elementos das terras raras","authors":"Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima","doi":"10.4322/2176-1523.20222637","DOIUrl":"https://doi.org/10.4322/2176-1523.20222637","url":null,"abstract":"Brazil has the second largest reserve of monazite, which is one of the three main minerals bearing of rare earth elements. In this study, a monazite concentrate, derived from the occurrence of heavy minerals in the coastal strips of the states of Bahia and Espírito Santos, was used. The best way to analyze aqueous solutions rich in rare earths by ICP-OES was also evaluated. In this work, the steps used to obtain an aqueous solution rich in rare earths from the monazite concentrate involved the following steps: addition of NaOH to the concentrate, heating at 400 ºC for 3 hours, washing with water and subsequent leaching of the remaining solid phase with HCl. Chemical and mineralogical characterizations were accomplished on the products of this process and the results indicated that the initial concentrate is rich in light rare earths, the alkaline fusion product is predominantly composed of rare earth hydroxides and free of NaOH. The acid leaching tailings showed to be rich in zirconite, indicating that the dissolution of the rare earth hydroxides formed in the previous step was complete. Spectral interferences in the lines of the predominant elements were considered in the ICP-OES analysis using individual patterns of these elements. The following lines were defined for the predominant elements: Ce 456.236 nm, Th 283.730 nm, La 384.902 nm, Nd 430.058 nm, Pr 390.844 nm, and Sm 428,079 nm. The leachate obtained after acid leaching of rare earth hydroxides was analyzed by this method and the concentrations of the predominant elements (in g/L) were: Ce 32.81, Th 14.76, La 8.58, Nd 3.35, Pr 3.02, and Sm 1.28","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527011","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}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222760
Jéssica Silva Rocha Pinho, L. Campanelli, D. Reis
With a turbojet compressor that had its blades fractured during laboratory tests, this work carried out a failure analysis aiming at characterizing the problem, identifying the fracture mechanism and proposing a potential post-manufacturing improvement. Typical steps of a failure analysis were performed, including visual and fractographic analyzes via stereomicroscopy and scanning electron microscopy. The evidence indicated that the component failed due to fatigue, with the presence of very evident striations on the fracture surface, due to a high surface roughness. Therefore, it was considered suitable to propose a shot peening treatment on the product as a way of inducing residual compressive stresses and hindering the process of nucleation of a fatigue crack.
{"title":"Case study on the failure analysis of turbojet compressor blades","authors":"Jéssica Silva Rocha Pinho, L. Campanelli, D. Reis","doi":"10.4322/2176-1523.20222760","DOIUrl":"https://doi.org/10.4322/2176-1523.20222760","url":null,"abstract":"With a turbojet compressor that had its blades fractured during laboratory tests, this work carried out a failure analysis aiming at characterizing the problem, identifying the fracture mechanism and proposing a potential post-manufacturing improvement. Typical steps of a failure analysis were performed, including visual and fractographic analyzes via stereomicroscopy and scanning electron microscopy. The evidence indicated that the component failed due to fatigue, with the presence of very evident striations on the fracture surface, due to a high surface roughness. Therefore, it was considered suitable to propose a shot peening treatment on the product as a way of inducing residual compressive stresses and hindering the process of nucleation of a fatigue crack.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527382","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}
{"title":"Comportamento microestrutural e de fluência do Inconel 718 após tratamento térmico de duplo envelhecimento","authors":"Fabrícia Assis Resende Gonçalves, Renata Jesuina Takahashi, Danieli Aparecida Pereira Reis","doi":"10.4322/2176-1523.20222592","DOIUrl":"https://doi.org/10.4322/2176-1523.20222592","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526170","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}
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