Materialwissenschaft und Werkstofftechnik最新文献

{"title":"Influence of shear cutting parameters on the edge properties and the fatigue behavior of non-oriented electrical steel sheets","authors":"A. Gottwalt-Baruth,&nbsp;P. Kubaschinski,&nbsp;M. Waltz,&nbsp;U. Tetzlaff","doi":"10.1002/mawe.202400094","DOIUrl":"https://doi.org/10.1002/mawe.202400094","url":null,"abstract":"<p>The fatigue behavior of a fully processed, non-oriented electrical steel sheet is investigated for different shear cutting parameters. Therefore, three cutting clearances (15 μm, 35 μm and 50 μm) in combination with two different punching tool wear states (sharp and worn) are compared regarding their mechanical properties. For this purpose, surface measurements, nanoindentation tests and stress-controlled fatigue tests with a positive load ratio are performed for all six parameter sets. During shear cutting the material gets locally strain-hardened and a deformed surface with micro-notches is created. Compared to a polished reference condition, the fatigue strength of the shear-cut sheets is severely deteriorated. However, the intensity of deterioration varies depending on the shear cutting parameters. For small cutting clearances, the highest fatigue life is observed for a sharp cutting tool. In contrast, for medium and high cutting clearances, samples that are cut with a worn tool achieve higher fatigue lives. Surface characteristics in the fracture zone, which act as a failure-critical crack location, are considered as the main influencing factor.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"537-548"},"PeriodicalIF":1.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mawe.202400094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the galvanic corrosion of B30 copper-nickel alloy and AISI 304 stainless steel with the effect of fluoride ions and protons using the wire beam electrode","authors":"X.-M. Wang,&nbsp;Q.-D. Zhong,&nbsp;J. Yang,&nbsp;S.-J. Zhang","doi":"10.1002/mawe.202400116","DOIUrl":"https://doi.org/10.1002/mawe.202400116","url":null,"abstract":"<p>The galvanic corrosion of AISI 304 stainless steel/B30 copper-nickel alloy (304SS/B30 Cu−Ni) was investigated in neutral and acidic solutions with and without fluoride ion (F⁻) by wire beam electrode techniques, macro-electrochemical methods and scanning electron microscope. The results show that the passivation film was eroded by the synergistic effect of the proton (H⁺) and fluoride ion on the coupled sample surfaces, leading to changes significantly in the surface electrochemical activity and corrosion rate. The surface morphology after being immersed for 48 h in different solutions was observed by scanning electron microscope. However, 304 stainless steel is used as an anode relative to B30 copper-nickel alloy, with a typical polarity reversal, when fluoride ion is added to an acidic solution with pH=2.0.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"503-516"},"PeriodicalIF":1.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888808","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}

{"title":"Ameliorating mechanical properties of treated mixed recycled aggregate concrete using a central composite design","authors":"A. Basnett,&nbsp;A. Sekar,&nbsp;Nachiar S","doi":"10.1002/mawe.202400202","DOIUrl":"https://doi.org/10.1002/mawe.202400202","url":null,"abstract":"<p>The rapid expansion of global infrastructure growth has caused a substantial rise in construction and demolition waste. This study introduces an innovative approach for investigating mixed recycled aggregate in concrete generated from construction and demolition waste by treating it with cement and nano-silica slurry wrapping techniques. A central composite design experimental methodology was used to optimise the slurry for treatment, considering cement content, nano-silica content, and water-to-aggregate ratio as independent variables. At the same time, water absorption and Los Angeles abrasion with visual inspection were response-targeted values. Multi-objective response optimisation and desirability analysis determined optimal levels. Scanning electron microscopy, x-ray diffraction, and x-ray fluorescence were used to analyse mixed recycled aggregate facade changes after treatment. In addition, concrete with untreated and optimised treated mixed recycled aggregate at 0 %, 25 %, 50 %, 75 %, and 100 % as a replacement for natural aggregate was tested for workability and mechanical properties. The findings showed that 50 % replacement improved concrete characteristics at the optimal percentage due to the coating process-filled fracture holes and densified mixed recycled material, improving concrete matrix bonding.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"517-536"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889129","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}

{"title":"A review on advances on flux cored arc welding of pipes and petrochemical pipelines","authors":"V. O. Odhiambo,&nbsp;J. M. Kihiu,&nbsp;B. R. Mose,&nbsp;J. G. Odhiambo","doi":"10.1002/mawe.202400189","DOIUrl":"https://doi.org/10.1002/mawe.202400189","url":null,"abstract":"<p>Flux cored arc welding has emerged as a vital welding technology in the realm of pipes and petrochemical pipelines, addressing the severe weld quality, material compatibility, and safety criteria in these essential applications. The paper begins with a brief description of the flux cored arc welding process, explaining its procedural complexities, the necessary tools used, and the variety of consumables used. The review then describes the complexities of flux cored arc welding's applicability in joining pipes due to the unique welding demands imposed by petrochemical pipelines. A thorough examination of flux cored arc welding characteristics and processes follows, identifying the critical welding parameters that have a significant impact on the structural strength and durability of flux cored arc welded joints. The review goes further to highlight key applications of flux cored arc welding through case studies by illustrating the adaptability of the welding procedure to different scenarios. An in-depth analysis of flux cored arc welding technological advancements that highlights the current developments in electrode composition, shielding gases, and automation is also considered. In conclusion, this study offers a thorough overview of flux cored arc welding uses in pipes and petrochemical pipelines, fusing technical clarification with real-world applications.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"549-564"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889131","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}

{"title":"Permeability, solubility and diffusivity of hydrogen in alloy 718","authors":"F. Ebling,&nbsp;T. Michler","doi":"10.1002/mawe.202400192","DOIUrl":"https://doi.org/10.1002/mawe.202400192","url":null,"abstract":"<p>The permeability, solubility, and diffusion of hydrogen in alloy 718 were examined through both, experimental results and data from existing literature. There is a notable difference between hydrogen solubilities calculated from concentration measurements and those derived from permeation measurements. Consequently, based on a synthesis of experimental and literature data, the following coefficients for hydrogen are proposed: K₀=186 mol/(m³ * MPa^0.5) and H_S=8140 J/mol for solubility, P₀=1.68 * 10⁻⁴ mol/(m³ * MPa^0,5) and H_P=57974 J/mol for permeability as well as D₀=9.01 * 10⁻⁷ m²/s and H_D=49834 J/mol for diffusivity. It is shown that these coefficients can largely be applied independently of the heat treatment of alloy 718.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"575-580"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mawe.202400192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of hot ductility behavior of micro-alloyed steel and the effect of strain rate and dynamic phase transformation on the 2nd ductility minimum","authors":"S. Bakhtiari,&nbsp;S. S. Sharifi,&nbsp;S. Ilie,&nbsp;C. Sommitsch","doi":"10.1002/mawe.202400249","DOIUrl":"https://doi.org/10.1002/mawe.202400249","url":null,"abstract":"<p>Continuous casting of steel is widely used to manufacture semi-finished long or flat products. Various stresses are present during slab casting: stresses arise from friction between the mold wall and the solidified shell, thermal stresses on the strand surface, and stresses from bending and straightening operations. Steels present a minimum ductility point during continuous casting in the solid-state condition. This work aims to answer the metallurgical reasons for the occurrence of the ductility minimum in a micro-alloyed steel by investigating the microstructural evolution. The samples are in situ melted via induction heating in the BETA250-5^® thermomechanical simulator machine, followed by hot tensile tests conducted at different temperatures and strain rates. The ductility drop is analyzed in the range of 650 °C–1100 °C at different strain rates, 10⁻² s⁻¹ to 10⁻³ s⁻¹. Furthermore, the study investigated the development of the ferrite phase at the prior austenite grain boundaries, the thickness of ferrite, dynamic phase transformation, and the influence of the test conditions on these parameters. The fracture mechanism and ferrite phase thickness are determined from metallography investigations using light optical microscopy and scanning electron microscopy. Finally, the microstructural changes are correlated to the ductility minimum using the measured results.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"601-611"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mawe.202400249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure prediction of semi-solid AZ91D magnesium alloy prepared by mechanical stirring based on regression analysis and neural network","authors":"X. Zhang,&nbsp;H. Luo,&nbsp;Y. Wang,&nbsp;B. Jiang,&nbsp;Z. Ji,&nbsp;J. Lui","doi":"10.1002/mawe.202400134","DOIUrl":"https://doi.org/10.1002/mawe.202400134","url":null,"abstract":"<p>In the present investigation two smart prediction tools, namely the multiple regression analysis and general regression neural network models were developed to predict average grain size and shape factor of the semi-solid AZ91D magnesium alloy microstructure prepared by mechanical stirring. The process parameters (stirring temperature, stirring rate, stirring time) were considered as input variables to establish predictive models. The models were developed using the multiple regression analysis was employed to determine the significance of process parameters on microstructure. In the general regression neural network models, the k-fold cross validation method is used to optimize the smoothing factor. The neural network models were trained, validated and tested. The results show the general regression neural network models achieve higher prediction accuracy for predicted error within 5 % compared with regression models within 10 %, which suggests that the model is more reliable. Finally, the accuracy of models was demonstrated based on experimental verification, asserting that they can provide a foundation for developing a comprehensive prediction system to optimize the structural and processing of semi-solid magnesium alloys.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"565-574"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889132","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}

{"title":"Experimental analysis of physico-mechanical and wear characteristics of grewia optiva fibre/walnut shell particles reinforced epoxy hybrid composites","authors":"B. Pratap,&nbsp;V. K. Patel","doi":"10.1002/mawe.202400198","DOIUrl":"https://doi.org/10.1002/mawe.202400198","url":null,"abstract":"<p>In recent years, the investigation of natural fibres as viable replacements for engineered fibres has gained significant prominence. Natural fibres come with remarkable environmental attributes, including biodegradability and renewability. This work aims to analyze the physical, mechanical, and wear behavior of grewia optiva-walnut filler-based epoxy composites. The walnut shell content varies from 0 wt.–%–12 wt.–%, whereas grewia optiva fibre is kept constant (i. e., 10 wt.–%) for all fabricated compositions. The results revealed that the 9 wt.–% of walnut content-based composites exhibited a higher value of tensile strength (123.9 MPa) and flexural strength (52.03 MPa), whereas higher hardness, which is 38.33 HV 5, was achieved for the 12 wt.–% of walnut content. Moreover, the influence of selected control variables, i. e., walnut content, sliding velocity, normal load, and sliding distance, on the specific wear rate (SWR) of the composites was ranked using the Taguchi analysis. Further, scanning electron microscope (SEM) analysis has also been performed for fractured surfaces.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"612-624"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889135","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}

{"title":"Biofilaments from recycled high-density polyethylene and rice husks for fused filament fabrication","authors":"M. N. Andanje,&nbsp;J. W. Mwangi,&nbsp;B. R. Mose,&nbsp;S. Carrara","doi":"10.1002/mawe.202400168","DOIUrl":"https://doi.org/10.1002/mawe.202400168","url":null,"abstract":"<p>The benefits of green technology have industrial use of composites reinforced with biofibers garner attention. They are replacing conventional plastics due to their capability to solve environmental issues. Despite this shift in material development, the synthesis of biodegradable biocomposites still poses a challenge due to their wide range of properties. This work focuses on developing biofilaments for fused filament fabrication from recycled high-density polyethylene and rice husk waste in varying proportions to study the effect of their different ratios on the biofilaments. High-density polyethylene though very popular, has not been widely explored in fused filament fabrication due to warping challenges and high thermal shrinkage of printed parts upon solidification. The addition of organic fillers has been proposed as a way to reduce these challenges. Rice husk waste has been used as a filler in polyethylene for conventional processes such as extrusion, injection molding, and pressing but not widely in additive manufacturing. In this study, a particle size of less than 75 μm and the use of a compatibilizer improved its miscibility in the polymer's matrix. The highest composition of the biofilament achieved was 35 % rice husks, 35 % recycled high-density polyethylene, and 30 % compatibilizer, an improvement of the rice husk filler from previous studies. Printability was attained up to a biofilament composition of 40 % recycled high-density polyethylene, 30 % rice husks, and 30 % compatibilizer. The maximum tensile strength, tensile modulus, and maximum tensile strain of this biofilament were 8.53 MPa (standard deviation of 1.32 MPa), 6.6 % (standard deviation of 0.03 %), and 128.56 MPa (standard deviation of 13 MPa), respectively. Though the addition of rice husk filler reduced the tensile strength, there was an improvement in the crystallinity of the biofilament which improved the shrinkage and warpage of the printed part. This work thus demonstrated an improvement in the rice husk content as a filler in biofilaments made from recycled high-density polyethylene with enhanced biodegradability.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 4","pages":"581-600"},"PeriodicalIF":1.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889134","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}

{"title":"Overlap joining of EN AW 7075 with laser beam welding in vacuum\u0000 Fügen von EN AW 7075 im Überlappstoß mit dem Laserstrahlschweißen im Vakuum","authors":"B.O. Gerhards,&nbsp;B. Gerhards,&nbsp;B. Macke,&nbsp;P. Häuser,&nbsp;M. Schleser,&nbsp;P. Liebe","doi":"10.1002/mawe.202400205","DOIUrl":"https://doi.org/10.1002/mawe.202400205","url":null,"abstract":"<p>The integration of EN AW 7075 aluminium in Body in White structures is a promising way to achieve weight savings, which in turn can make a significant contribution to reducing CO₂-emissions. However, due to hot cracking susceptibility, conventional welding technologies offer limited possibilities to join the material. Therefore, laser beam welding in vacuum is introduced as a comparatively new joining technique. The investigations show, that it is possible to weld the EN AW 7075 alloy in an overlap joint configuration without pores or microcracks appearing in the weld seam. The weld seam has a very fine-grained structure, which presumably has a favourable effect on hot cracking mechanism. The prevention of cracking is likely due to the lower temperature gradient between the capillary wall and the fusion line caused by the low evaporation temperature due to the reduced pressure. The reduced temperature results in lower residual stresses, which presumably has a positive effect on the tendency to hot cracking. In addition, the fine-grained structures can absorb strain better than coarse grain structures, that usually occur in conventional laser beam welding.</p>","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 3","pages":"376-387"},"PeriodicalIF":1.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mawe.202400205","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}