Acta Metallurgica Slovaca最新文献_第5页

GRAIN SIZE EVOLUTION, MECHANICAL AND CORROSION BEHAVIOUR OF PRECIPITATE STRENGTHENED Cu-Ni ALLOY 沉淀强化Cu-Ni合金的晶粒演变、力学行为和腐蚀行为

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1609

C. Nwaeju, Amarachukwu Eboh, F.O. Edoziuno

{"title":"GRAIN SIZE EVOLUTION, MECHANICAL AND CORROSION BEHAVIOUR OF PRECIPITATE STRENGTHENED Cu-Ni ALLOY","authors":"C. Nwaeju, Amarachukwu Eboh, F.O. Edoziuno","doi":"10.36547/ams.28.4.1609","DOIUrl":"https://doi.org/10.36547/ams.28.4.1609","url":null,"abstract":"Grain size characteristics, mechanical properties, and corrosion resistance of Cu-10%Ni alloy heat treated at three different temperatures and times were investigated and compared with the synthesized alloy. Mechanical properties such as UTS, ductility, hardness, and impact strength were determined. An optical metallurgical microscope was used to examine the structural properties. ImageJ software was also used to measure the grain size distribution of the alloys. The corrosion behaviour of the produced Cu-10%Ni alloys is analyzed by potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS). After corrosion testing, the surface morphology of the exposed samples is analyzed by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy. The corrosion rate of precipitate strengthened Cu-10%Ni alloy decreases and ultimate tensile strength, ductility, and hardness increase as the average grain size distribution decreases. The non-heat treated Cu-10%Ni alloy showed a peak value of corrosion rate and average grain size, but a lower value of mechanical properties. An increase in residual stress follows an increase in grain size distribution, which lowers the strength and increases corrosion rates due to more active sites. The research outcome has enabled the improvement of the mechanical and corrosion properties of Cu-10%Ni alloys as a component for marine and automobile applications.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45985044","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: 1

HRPD and TEM Study of P/M 58Fe17Cr25Ni Austenitic Stainless Steel Synthesized by Spark Plasma Sintering 放电等离子烧结法制备P/M58Fe17Cr25Ni奥氏体不锈钢的HRPD和TEM研究

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1548

S. Mustofa, M. Dani, P. Parikin, T. Sudiro, B. Hermanto, D. R. Adhika, A. Insani, S. Syahbuddin, T. Hino, C. A. Huang

{"title":"HRPD and TEM Study of P/M 58Fe17Cr25Ni Austenitic Stainless Steel Synthesized by Spark Plasma Sintering","authors":"S. Mustofa, M. Dani, P. Parikin, T. Sudiro, B. Hermanto, D. R. Adhika, A. Insani, S. Syahbuddin, T. Hino, C. A. Huang","doi":"10.36547/ams.28.4.1548","DOIUrl":"https://doi.org/10.36547/ams.28.4.1548","url":null,"abstract":"58Fe17Cr25Ni austenite stainless steel has been fabricated using metal powder through sintering with a spark plasma at temperatures of 900 and 950°C for 5 minutes. High purity Fe, Ni and Cr powders were used as materials for this steel. Before sintering, the powder was mixed in a milling equipment which was processed for 5 hours, then it is formed into a coin by pressing it under a load of 25 tons. High resolution powder neutron diffractometer was used for identifying the crystal structure in the 58Fe17Cr25Ni austenitic stainless steel. The sintering process at temperatures of 900C and 950°C generally forms microstructure having matrix of equiaxed austenite grains, with a crystal structure of face-centered cubic which included in the Fm3m space group. Some particles with high Cr content, a'-Cr, are distributed in all austenite grains. The austenite grains seen in the 58Fe17Cr25Niaustenitic stainless steel sintered at 900°C are twin grains. Dislocations, slip planes and bands are also existed in those grains. These defects are expected to decrease with increasing sintering temperatures up to 950° C. This change was followed by the appearance of air bubbles and sub-grains as the dominant sub-structures in the 58Fe17Cr25Ni austenitic stainless steel sintered at 950°C.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46979535","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

ADDITIVE MANUFACTURING: A NEW CONCEPT FOR END USERS. THE CASE OF MAGNETIC MATERIALS 增材制造:面向终端用户的新概念。磁性材料的例子

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1648

A. Di schino, G. Stornelli

引用次数: 4

DECREASING MECHANICAL PROPERTIES OF THE SUPERHEATER STEEL GRADE P22 HEATED AT ELEVATED TEMPERATURE UNDER CONSTANT STRESS P22级过热器在恒定应力作用下的力学性能下降

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1610

A. Bui, C. Nguyen, ThuHien Nguyen

{"title":"DECREASING MECHANICAL PROPERTIES OF THE SUPERHEATER STEEL GRADE P22 HEATED AT ELEVATED TEMPERATURE UNDER CONSTANT STRESS","authors":"A. Bui, C. Nguyen, ThuHien Nguyen","doi":"10.36547/ams.28.4.1610","DOIUrl":"https://doi.org/10.36547/ams.28.4.1610","url":null,"abstract":"This paper investigated change of the mechanical properties of the superheater pipe steel grade P22 (ASTM A335) under constant stress of 9.68 MPa and various temperatures of 500-700 oC. The steel specimens were prepared from the new steel pipe taken from a coal-fired power plant in Vietnam, then heated to the given temperature and held for the predetermined time as 24, 48 and 72 hours in the atmosphere. The results showed that the mechanical properties of the steel P22 decreased with the increased temperature and time. This deterioration of the steel strength was caused by the redistribution of the carbide in the steel subjected under the elevated temperature and the constant stress. Although change in the microstructure including phase and grain size was not observed, the SEM micrographs showed that the carbide of the heated steel accumulated on the grain boundaries and the triple regions when the temperature and holding time increased. This phenomenon was attributed to reduce number of the carbide in the steel, resulting in decrease of the mechanical properties. The obtained results indicated that decrease of the mechanical properties of the steel pipe P22 can occur in the early period of working time in the practice.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44164005","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

CORROSION BEHAVIOR OF Al/SiC/PKSA HYBRID COMPOSITES IN 1.0 M H2SO4 ENVIRONMENT USING POTENTIODYNAMIC POLARIZATION TECHNIQUE Al/SiC/PKSA杂化复合材料在1.0 M H2SO4环境中的腐蚀行为

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1561

P. Ikubanni, M. Oki, A. A. Adeleke, E. Ajisegiri, M. Fajobi

引用次数: 0

VANADIUM ALLOYING IN S355 STRUCTURAL STEEL: EFFECT ON RESIDUAL AUSTENITE FORMATION IN WELDED JOINTS HEAT AFFECTED ZONE S355结构钢中钒合金化对焊接接头热影响区残余奥氏体形成的影响

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Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI: 10.36547/ams.28.3.1535

G. Stornelli, Matteo Gaggiotti, D. Gattia, R. Schmidt, Mirko Sgambetterra, Anastasiya Tselikova, G. Zucca, A. Schino

引用次数: 4

NbC TRANSFORMATION DURING AGING IN HP40-Nb HEAT RESISTANT ALLOY HP40-Nb耐热合金时效过程中的NbC相变

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Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI: 10.36547/ams.28.3.1562

M. H. Sosa Lissarrague, C. Lanz

引用次数: 0

ANALYSING EFFECT OF QUENCHING AND TEMPERING INTO MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 304-SS WELDED PLATES 调质对304-s焊接板力学性能和组织的影响分析

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Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI: 10.36547/ams.28.3.1556

Saurabh Dewangan, S. Chattopadhyaya

{"title":"ANALYSING EFFECT OF QUENCHING AND TEMPERING INTO MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 304-SS WELDED PLATES","authors":"Saurabh Dewangan, S. Chattopadhyaya","doi":"10.36547/ams.28.3.1556","DOIUrl":"https://doi.org/10.36547/ams.28.3.1556","url":null,"abstract":"The present work deals with analysis of mechanical performance and microstructural appearance of quenched and tempered SS-304 welded joints made by MIG welding technique. Since welding involves a critical solidification and thereby lots of internal stresses. Hence, heat treatment becomes important for removing stresses. In the present work, two SS-304 welded plates were heat treated. First plate was in quenched condition, and another was in tempered state. In both the plates, mechanical properties like tensile strength, impact strength, and hardness were analyzed. In addition, the microstructural attributes of base metal, heat affected zone and welded joints in both the welded plates were analyzed through optical microscope. The fractography analysis was also carried out in this study to get information about failure characteristics of samples after tensile testing. A significant change in mechanical properties, such as, 150% improvement in toughness, 7% reduction in weld-zone hardness, 3% improvement in yield strength and 6% reduction in ultimate tensile strength was obtained after tempering work. Also, the tempering process had reformed the grain structure by creating twins in base metal, and lathy δ ferrite & γ+δ lamella in HAZ. The martensite formed in quenched specimen had been completely recovered into fine γ+δ matrix. ","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42933930","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: 3

STUDY ON A TWO-PHASE LOW-TEMPERATURE MODEL OF THE FEATURES OF METAL TAPPING IN BASIC OXYGEN FURNACE 碱性氧炉金属出丝特征的两相低温模型研究

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Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI: 10.36547/ams.28.3.1566

T. Golub, L. Molchanov, A. Koveria, L. Kieush

引用次数: 0

THERMAL STABILITY AND THERMAL EXPANSION BEHAVIOR OF AlFeCoNiCu AS-CAST HIGH-ENTROPY DUAL-PHASE ALLOY 铸态高熵双相合金的热稳定性和热膨胀行为

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Acta Metallurgica Slovaca Pub Date : 2022-09-24 DOI: 10.36547/ams.28.3.1551

K. Shmakova, V. Tsepelev, O. Chikova

{"title":"THERMAL STABILITY AND THERMAL EXPANSION BEHAVIOR OF AlFeCoNiCu AS-CAST HIGH-ENTROPY DUAL-PHASE ALLOY","authors":"K. Shmakova, V. Tsepelev, O. Chikova","doi":"10.36547/ams.28.3.1551","DOIUrl":"https://doi.org/10.36547/ams.28.3.1551","url":null,"abstract":"This work is devoted to the thermal stability and thermal expansion of dual-phase AlFeCoNiCu as-cast high-entropy alloy of equiatomic composition. The mix FCC + BCC phases is in AlFeCoNiCu high entropy alloy. According to characterized by EDS-analysis, Fe and Co are almost uniformly distributed in both phases in comparison with other elements. The BCC phase is rich in Ni and Al, and the FCC phase is Cu. Our measurement results of hardness and elastic modulus values for inter dendrites (FCC phase) and dendrites (BCC phase) of as-cast AlFeCoNiCu alloy showed the difference between there. Hardness values for inter dendrites and dendrites: 3.4±0.4GPa and 4.1±0.6GPa. Elastic modulus values for inter dendrites and dendrites: 130.5±2.0GPa and 166.5±5.6GPa. The thermal stability of the phases presented in AlFeCoNiCu as-cast high-entropy alloy has been studied with dilatometry and differential scanning calorimetry (DSC). The DSC thermogram shows an endothermic peak at 1000K. The coefficient of thermal expansion (CTE) curve shows linear increment from room temperature up to 1370K from (10.6 ± 0.3)×10-6K−1 to (27.7 ± 0.3) ×10-6K−1. The CTE temperature curve also shows the peak at 1000K. The peaks in the CTE temperature and the DSC curve suggest a phase transformation with increasing temperature up to~1000K.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42645811","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