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Phase Prediction, Microstructure, and Microhardness of Sintered Nickel-Based Superalloy 烧结镍基超级合金的相位预测、微观结构和显微硬度
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-es8wsb
B. Babalola, Rudzani Nengwekhulu, O. Ayodele, Boitumelo Charmaine Mashabela, P. Olubambi
{"title":"Phase Prediction, Microstructure, and Microhardness of Sintered Nickel-Based Superalloy","authors":"B. Babalola, Rudzani Nengwekhulu, O. Ayodele, Boitumelo Charmaine Mashabela, P. Olubambi","doi":"10.4028/p-es8wsb","DOIUrl":"https://doi.org/10.4028/p-es8wsb","url":null,"abstract":"In this study, the phase formation, microstructure and microhardness of nickel-based superalloy fabricated using a spark plasma sintering technique were evaluated. The microstructure and microhardness of the nickel-based superalloy were explored at diverse sintering temperatures (600 °C - 1050 °C). The phase formations and volume fraction with respect to temperature were predicted by using CALPHAD-based software. The microstructure, phase constitution, and microhardness were evaluated via scanning electron microscope (SEM), X-ray diffraction (XRD), and Vickers hardness tester. The findings indicated that the spark plasma sintering technique enables the development and growth of the necking of particles, enhancing elemental bonding and alloy densification as the temperature increases. The hardness value increases at increasing temperatures, with a maximum value of 353 HV attained at a temperature of 1050 °C.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"19 s1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264146","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
The Influence of Cow’s Bone Calcium Concentration on the Mechanical Characteristics of a Mg-Al Alloy 牛骨钙浓度对镁铝合金机械特性的影响
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-jjia46
T. Azeez, S. Akande, S. Afolalu, A. Adetunla, Bernard Adaramola
{"title":"The Influence of Cow’s Bone Calcium Concentration on the Mechanical Characteristics of a Mg-Al Alloy","authors":"T. Azeez, S. Akande, S. Afolalu, A. Adetunla, Bernard Adaramola","doi":"10.4028/p-jjia46","DOIUrl":"https://doi.org/10.4028/p-jjia46","url":null,"abstract":"Magnesium aluminium of the magnesium-alloy variety have long been extensively utilized in different technical applications and are still capturing the attention of researchers because of their cost-effectiveness and lightness. Grain fractal sizes, microstructural relationships, and sphericity, as well as their relationship with service performance, were discovered for numerous frequently employed Mg-Al alloys. As a result, the influence of cow’s bone extracts calcium on the mechanical behaviours as well as microstructure of Magnesium aluminium alloy was investigated in this work. Calcium (0.5% weight) concentration, formations with uniform and non-uniform grain boundaries led to alloy hardening. 286.537MPa and 57.3 HB are respectively the highest tensile strength and hardness gotten.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264751","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
Enhanced Microhardness and Corrosion Performance of Additively Manufactured Inconel 718 Specimens through Nanostructuring by Severe Plastic Deformation 通过剧烈塑性变形进行纳米结构化，增强快速成型 Inconel 718 试样的显微硬度和腐蚀性能
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-zcdb79
S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao
{"title":"Enhanced Microhardness and Corrosion Performance of Additively Manufactured Inconel 718 Specimens through Nanostructuring by Severe Plastic Deformation","authors":"S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao","doi":"10.4028/p-zcdb79","DOIUrl":"https://doi.org/10.4028/p-zcdb79","url":null,"abstract":"Severe plastic deformation (SPD) processes, particularly high-pressure torsion (HPT) have been increasingly applied to metallic specimens fabricated by laser powder bed fusion (L-PBF) additive manufacturing (AM) for enhancing their mechanical and functional properties through nanoscale grain refinement (≤ 100 nm). In this study. L-PBF AM-fabricated Inconel 718 (IN 718) specimens are initially subjected to 10 HPT revolutions to produce nanosized grains. Subsequently, microstructural characterisation, as well as hardness and electrochemical tests are conducted to evaluate the evolution of microstructures, hardness, and corrosion performance of the as-received and HPT-processed specimens by using various microscopy, Vickers microhardness (HV) measurements, and corrosion performance, respectively. The results reveal an average grain size of ~ 46 nm, dense dislocation networks, and nanotwins after 10 HPT processing, which contribute to the two-fold hardness increase compared to the as-received condition. Such microstructures also contributed to the overall improved corrosion performance after 10 HPT processing, as quantified by the 83% and 73% reduction in corrosion rate and pitting potential, respectively.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"228 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265168","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
Effect of Roll Diameter on Temperature of Aluminum Alloy Strip during Casting Using a Vertical Type High Speed Twin Roll Caster 使用立式高速双辊连铸机进行铸造时，轧辊直径对铝合金带温度的影响
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-jqcc2k
T. Haga, Toshiaki Okamoto, H. Watari, Shinichi Nishida
{"title":"Effect of Roll Diameter on Temperature of Aluminum Alloy Strip during Casting Using a Vertical Type High Speed Twin Roll Caster","authors":"T. Haga, Toshiaki Okamoto, H. Watari, Shinichi Nishida","doi":"10.4028/p-jqcc2k","DOIUrl":"https://doi.org/10.4028/p-jqcc2k","url":null,"abstract":"The temperature of an aluminum alloy (Al-6%Si) strip cast using a vertical-type high-speed twin-roll caster was measured by inserting a K-type thermocouple into the strip. The effects of the roll diameter on supercooling, cooling rate, and temperature at the roll bite were investigated. It was found that the roll diameter affects the cooling condition of the strip. The thickness of the thermocouple was 0.1 mm and the sampling rate was 100 Hz. Copper rolls with diameters of 300 and 600 mm, respectively, were used. The roll width was 100 mm and the roll speed was 30 m/min. The roll load was 5 or 20 kN.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"12 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140263320","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
High Efficiency Milling of Inconel 625 Alloy (Effect of Cutting Condition on Tool Life) 高效铣削铬镍铁合金 625（切削条件对刀具寿命的影响）
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-7bxhyc
Kazumasa Kawasaki, Ryuma Hasegawa
{"title":"High Efficiency Milling of Inconel 625 Alloy (Effect of Cutting Condition on Tool Life)","authors":"Kazumasa Kawasaki, Ryuma Hasegawa","doi":"10.4028/p-7bxhyc","DOIUrl":"https://doi.org/10.4028/p-7bxhyc","url":null,"abstract":"Inconel 625 alloy consisting of Ni and Cr and others has advantageous properties such as heat resistance and corrosion resistance, which make it a suitable material for application in aerospace, energy, and marine industries. However, it is also a difficult-to-machine material because of factors such as work hardening, low thermal conductivity, and high tool affinity. Therefore, the problems of the tool wear, chipping, and adhesion often occur in milling of Inconel 625 alloy using end mills. In this study, the milling of Inconel 625 was conducted using coated cemented carbide end mills, and the cutting conditions with the high efficiency were investigated under three rotational speeds and four feed rates. The results showed that increasing the feed rate increased the surface roughness, but did not increase the tool life. In addition, the results also showed that increasing the rotational speed did not increase the tool life, but reduced the surface roughness. As a result, the effects of the rotational speeds and feed rates on the tool life were clarified.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"28 S1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265064","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
Use of Domestic Waste Polyethylene as a Bitumen Modifier in Bituminous Pavement Applications 在沥青路面应用中使用生活垃圾聚乙烯作为沥青改性剂
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-lc2bt4
Mitali Saharia, Kh.Lakshman Singh
{"title":"Use of Domestic Waste Polyethylene as a Bitumen Modifier in Bituminous Pavement Applications","authors":"Mitali Saharia, Kh.Lakshman Singh","doi":"10.4028/p-lc2bt4","DOIUrl":"https://doi.org/10.4028/p-lc2bt4","url":null,"abstract":"The present study evaluated the use of domestic waste polyethylene (PE) in the applications of bituminous pavement. This study investigates the performance of the mixes using different waste PE percentages, i.e., 1%, 2%, 3%, 4% and 5%. It is observed that the softening point and elastic recovery value increase with PE content increases. The penetration index (PI) and temperature susceptibility of binders were evaluated. Adding PE to bitumen shows an improvement in the temperature susceptibility of the modified binders. The Marshall Stability value of bitumen containing 3% PE is higher at 69.65% than virgin binder stability. When 3% PE modified bitumen to the mixes, its indirect tensile strength (ITS) is 70.44 % higher than the conventional mix. The tensile strength ratio (TSR) value improved from 62% (unmodified binder) to 91.18% (modified binder) at 3% PE content, which is 47% higher than the conventional mixture. It indicates that the moisture susceptibility of mixes using PE is higher than conventional mix. Additionally, the mix deformation resistance with 3% PE was found to be 68.75% higher than the mix made with the unmodified binder. The study found that the bituminous mixes using PE have shown higher effectiveness in the properties such as stability, indirect tensile strength, rutting resistance, etc. of the mixes. It indicates that bituminous mixes with modified binders with PE provide higher resistance to permanent deformation.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"23 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265084","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
Metalworking Technologies and Building Materials 金属加工技术和建筑材料
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/b-9mvw2a
Steven Y. Liang, H. Watari, A. Abioye
{"title":"Metalworking Technologies and Building Materials","authors":"Steven Y. Liang, H. Watari, A. Abioye","doi":"10.4028/b-9mvw2a","DOIUrl":"https://doi.org/10.4028/b-9mvw2a","url":null,"abstract":"","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"30 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140263123","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
Processing Maps and Optimized Plastic Behavior Model of TC4 Titanium Alloy Diffusion Bonded Joint at α+β Region Temperatures TC4 钛合金扩散粘接接头在 α+β 区域温度下的加工图和优化塑性行为模型
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-uvb9dt
Can Li, Yong Li, Xiao Xing Li, Dexin Zhang, Imran Sardar Muhammad, Yue Liu
{"title":"Processing Maps and Optimized Plastic Behavior Model of TC4 Titanium Alloy Diffusion Bonded Joint at α+β Region Temperatures","authors":"Can Li, Yong Li, Xiao Xing Li, Dexin Zhang, Imran Sardar Muhammad, Yue Liu","doi":"10.4028/p-uvb9dt","DOIUrl":"https://doi.org/10.4028/p-uvb9dt","url":null,"abstract":"The hot processing maps and optimized Arrhenius constitutive model of the TC4 diffusion bonded joint were investigated based on high temperature tensile tests in the temperature range of 1024–1174 K and strain rate range of 0.0001–0.1 s–1. The optimal hot processing parameter in the tensile deformation mode was 0.0001–0.001 s–1/1124 K and 0.0001–0.1 s–1/1174 K, respectively, when the true strain was 0.2. A modified strain compensated Arrhenius-type constitutive model of the joint by combining the evolutionary algorithm and generalized reduced gradient was established. The values of correlation coefficient and average absolute relative error were 0.989 and 7.29%, respectively, indicating the good prediction capabilities.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"50 4‐5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264447","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
Reduction of Surface Cracking for Al-4.6%Mg Strips Cast Surface Using an Unequal-Diameter Twin-Roll Caster by Back-Dam Plate with Lip 使用带唇背坝板的不等径双辊连铸机减少 4.6%Mg 铝带铸造表面裂纹
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-0gcjos
T. Haga, Kazuki Yamazaki, H. Watari, Shinichi Nishida
{"title":"Reduction of Surface Cracking for Al-4.6%Mg Strips Cast Surface Using an Unequal-Diameter Twin-Roll Caster by Back-Dam Plate with Lip","authors":"T. Haga, Kazuki Yamazaki, H. Watari, Shinichi Nishida","doi":"10.4028/p-0gcjos","DOIUrl":"https://doi.org/10.4028/p-0gcjos","url":null,"abstract":"Cracks occur on the surface of Al-Mg strips cast using a high-speed twin-roll caster. Surface cracking of the as-cast strip decreases with decreasing roll load. However, the difficulty of roll casting increases as the roll load is decreased because the strip becomes brittle and is easily broken because the strip is not completely solidified. In the present study, an unequal-diameter twin-roll caster, which is capable of high-speed casting, was used with a lip attached to a back-dam plate in an attempt to decrease surface cracking without deceasing the roll load. The thickness of the solidified layer was found to decrease as the length of the solidified region decreased. The thickness of the solidified layer at the center of the width direction of a strip on the lower roll decreased by shortening the solidification length by a lip attached to a back dam-plate. The solidified layer at the edges was thicker than that inside the cast strip. The thickness of semisolid metal inside the cast strip increased more than that at the edges of the roll bite. The roll load at the width of the lip decreased. The effect of the lip length on surface cracks was investigated.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"129 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140078755","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 and Microstructural Behavior of Sintered NiAl-Based High Entropy Alloy 烧结镍铝基高熵合金的力学和微结构行为
Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-4mp8t4
E. Olorundaisi, B. Babalola, M. L. Teffo, P. Olubambi
{"title":"Mechanical and Microstructural Behavior of Sintered NiAl-Based High Entropy Alloy","authors":"E. Olorundaisi, B. Babalola, M. L. Teffo, P. Olubambi","doi":"10.4028/p-4mp8t4","DOIUrl":"https://doi.org/10.4028/p-4mp8t4","url":null,"abstract":"A high entropy Ni-Al-Ti-Mn-Co-Fe-Cr alloy (HEA) system was fabricated using spark plasma sintering (SPS). The alloys at different elemental compositions were developed at a sintering temperature of 850 °C, a heating rate of 90 °C/min, a pressure of 50 MPa, and a dwelling time of 5 min. The sintered alloys' mechanical characteristics, microstructure, phase evolution, and density were assessed. The evolved microstructure of the sintered HEAs shows a homogenous dispersion of the alloying metals. The sintered microstructures showed a mixture of simple and complex phases. The phase refinement shows that the sintered HEAs exhibited a lower and the least grain size of 2.28 µm compared to the Ni50Al50 alloy having 8.26 µm. Likewise, a higher micro-strain value of 1.25E-1 was attained by the non-equal atomic HEA, while the unalloyed has 1.87E-3. The microhardness value of the sintered alloys varied from 103.5 HV to 139.2 HV, while their measured density varied from 5.23 g/cm3 to 6.44 g/cm3.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"105 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140079821","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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