Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA最新文献_第4页

A Study on Laser Welding of Titanium and Stainless Steel 钛与不锈钢激光焊接的研究

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6584

Angshuman Chattopadhyay, Gopinath Muvvala, V. Racherla, A. Nath

{"title":"A Study on Laser Welding of Titanium and Stainless Steel","authors":"Angshuman Chattopadhyay, Gopinath Muvvala, V. Racherla, A. Nath","doi":"10.1115/MSEC2018-6584","DOIUrl":"https://doi.org/10.1115/MSEC2018-6584","url":null,"abstract":"Joining of dissimilar metals and alloys has been envisioned since a long time with specific high end applications in various fields. One such combination is austenitic stainless steel grade SS304 and commercial grade titanium, which is very difficult to join under conventional fusion process due to extensive cracking and failure caused by mismatch in structural and thermal properties as well as formation of the extremely brittle and hard intermetallic compounds. One of the methods proposed in literature to control the formation of intermetallics is by fast cooling fusion process like laser beam welding. The present study has been done on laser welding of titanium and stainless steel AISI 304 to understand the interaction of these materials during laser welding at different laser power and welding speed which could yield different cooling rates. Two types of cracks were observed in the weld joint, namely longitudinal cracks and transverse cracks with respect to the weld direction. Longitudinal cracks could be completely eliminated at faster welding speeds, but transverse cracks were found little influenced by the welding speed. The thermal history, i.e. melt pool lifetime and cooling rate of the molten pool during laser welding was monitored and a relation between thermo-cycle with occurrence of cracks was established. It is inferred that the longitudinal cracks are mainly due to the formation of various brittle intermetallic phases of Fe and Ti, which could be minimized by providing relatively less melt pool lifetime at high welding speeds. The reason of the transverse cracks could be the generation of longitudinal stress in weld joint due to the large difference in the thermal expansion coefficient of steel and titanium. In order to mitigate the longitudinal stress laser welding was carried out with a novel experimental arrangement which ensured different cooling rates of these two metals during laser welding. With this the tendency of transverse cracks also could be minimized significantly.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114328113","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

An Experimental Study of Wedge Indentation of Porous Solids: Implications for Cutting and Drilling Processes 多孔固体的楔形压痕实验研究:对切削和钻孔工艺的影响

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6629

Shwetabh Yadav, T. Murthy, D. Sagapuram

引用次数: 0

Nickel/Alumina Metal Matrix Nanocomposites Obtained by High-Energy Ball Milling and Spark Plasma Sintering 高能球磨和放电等离子烧结制备镍/氧化铝金属基纳米复合材料

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6610

E. Martínez-Franco, Ming Li, Ricardo Cuenca Álvarez, J. Hernández, Chao Ma, J. M. A. Orozco

{"title":"Nickel/Alumina Metal Matrix Nanocomposites Obtained by High-Energy Ball Milling and Spark Plasma Sintering","authors":"E. Martínez-Franco, Ming Li, Ricardo Cuenca Álvarez, J. Hernández, Chao Ma, J. M. A. Orozco","doi":"10.1115/MSEC2018-6610","DOIUrl":"https://doi.org/10.1115/MSEC2018-6610","url":null,"abstract":"Metal matrix nanocomposites (MMNCs) are anticipated to offer significantly better performance than existing superalloys. Nickel/alumina nanocomposite samples were fabricated with a powder metallurgy method, combining high-energy ball milling (HEBM) and spark plasma sintering (SPS). The objective of this research is to determine the effect of alumina nanoparticle fraction and HEBM parameters on the powder preparation and sintering processes, and resultant microstructure and properties. Nickel-based powders containing various fractions (1, 5 and 15 vol.%) alumina nanoparticles were prepared by HEBM. The initial particle sizes were 44 μm and 50 nm for nickel and alumina, respectively. The milling process was conducted by starting with mixing at 250 rpm for 5 min, followed by cycling operation at high and low speeds (1200 rpm for 4 min and 150 rpm for 1 min). Samples at different milling times (30, 60, 90 and 120 min) of each composition were obtained. Scanning electron microscopy (SEM) was used to evaluate the dispersion of nanoparticles in the powders at different milling times. SPS technique was used for consolidation of the prepared powders. SEM images showed that alumina nanoparticles are homogeneously dispersed in the metal matrix in the sample containing 15 vol.% alumina. Hardness measurements in cross sections of SPSed samples showed higher values for Ni/Al2O3 MMNC compared to pure Ni.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116170577","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

Preparation of Metal Matrix Nanocomposite Powder Using Electroless Plating 化学镀法制备金属基纳米复合粉体

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6676

Ming Li, Chao Ma, Alex Fang, Z. Pei

引用次数: 2

Optimizing Process Conditions in Friction Stir-Diffusion Lap Welding of Aluminum Alloy With Cold Rolled Steel 铝合金与冷轧钢摩擦-搅拌-扩散搭接焊工艺条件优化

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6711

F. Al-Badour, N. Merah, O. Mohamed, A. Bazoune, A. Shuaib

{"title":"Optimizing Process Conditions in Friction Stir-Diffusion Lap Welding of Aluminum Alloy With Cold Rolled Steel","authors":"F. Al-Badour, N. Merah, O. Mohamed, A. Bazoune, A. Shuaib","doi":"10.1115/MSEC2018-6711","DOIUrl":"https://doi.org/10.1115/MSEC2018-6711","url":null,"abstract":"This paper deals with the development of friction stir diffusion bonding between 2 mm thick 5052 Aluminum alloy and Cold rolled Steel for cladding application. The investigation focuses on the effect of process conditions on tensile-shear strength of produced lap joint by considering four independent welding parameters: tool rotational speed, welding speed, tool axial force and tool offset in the consecutive pass. A short tool-pin was utilized to avoid tool penetration into the steel substrate and mechanical mixing between clad material and the substrate. In order to optimize the process parameters for maximum joint strength and minimize the number of tests, Taguchi orthogonal array L9 with four factors and three levels was used. Results revealed that tool rotational speed had the greatest influence on produced weld strength. On the other hand, the tool pin length or penetration depth was found to have more effect on weld strength than the axial force. Moreover, clamps’ rigidity had a great impact on joint strength. For the selected material and tool, the optimum welding conditions were found to be 1000 rpm rotational speed, 12 kN plunging force, 100 mm/min welding speed and 12 mm tool offset.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124591090","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

An Analysis of Microstructure and Microhardness Distribution in Underwater Wet Welding of 304L Austenitic Stainless Steel to Low Alloy Steel 16Mn 304L奥氏体不锈钢与16Mn低合金钢水下湿焊组织及显微硬度分布分析

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6434

Li Hongliang, Duo Liu, Zhi Wang, N. Guo, Jicai Feng

{"title":"An Analysis of Microstructure and Microhardness Distribution in Underwater Wet Welding of 304L Austenitic Stainless Steel to Low Alloy Steel 16Mn","authors":"Li Hongliang, Duo Liu, Zhi Wang, N. Guo, Jicai Feng","doi":"10.1115/MSEC2018-6434","DOIUrl":"https://doi.org/10.1115/MSEC2018-6434","url":null,"abstract":"In this study, underwater wet welding of 304L austenitic stainless steel to 16Mn low alloy steel was carried out using self-shielded flux-cored wires at a water depth of 0.3 m. The welds were produced using commercially obtained ER308 filler and specially developed nickel-based tubular wire. Microstructure and microhardness of wet welded joints have been particularly analyzed. The interface between austenitic weld metal and ferritic base metal was also discussed in detail.\u0000 A robust weld of 304L/16Mn joint could be achieved by FCAW process using nickel-based tubular wire. Commercially obtained ER308 consumables failed to acquire sound welded joints due to large amount of slag remained in the groove. Ni-based weld metal was fully austenitic with well-developed columnar sub-grains while ER308 weld metal consisted of d-ferrite with different morphologies in the austenitic matrix. Type II boundary existed between austenitic weld metal and ferritic base metal. Compared to ER308 weld metal, Ni-based weld metal possessed the ability to be diluted by 16Mn base metal.\u0000 Maximum hardness values in wet welding appeared in coarse-grained heat affected zone instead of transition zone for both consumables. Austenitic stainless steel welded joints exhibited high microhardness in the transition zone of 16Mn side, which was strongly diluted by ferritic base metal.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126728096","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 Graphene Addition on Crack Propagation Resistance in Glass Fibre Reinforced Polymer Matrix Composite 石墨烯对玻璃纤维增强聚合物基复合材料抗裂纹扩展性能的影响

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6563

G. Vigneshwaran, S. Prabu, R. Paskaramoorthy

引用次数: 1

Characterization of Welding Attributes in Friction Spot Stir Welding of High-Density Polyethylene/Multi-Walled Carbon Nanotube Composites 高密度聚乙烯/多壁碳纳米管复合材料搅拌摩擦点焊焊接特性研究

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6317

F. Stan, NICOLETA-VIOLETA Stanciu, C. Fetecau, L. Sandu

{"title":"Characterization of Welding Attributes in Friction Spot Stir Welding of High-Density Polyethylene/Multi-Walled Carbon Nanotube Composites","authors":"F. Stan, NICOLETA-VIOLETA Stanciu, C. Fetecau, L. Sandu","doi":"10.1115/MSEC2018-6317","DOIUrl":"https://doi.org/10.1115/MSEC2018-6317","url":null,"abstract":"In this work, friction spot stir welding (FSSW) is applied to join high-density polyethylene/multi-walled carbon nanotube (HDPE/MWCNTs) composites. Injection-molded coupons were welded with a single lap-shear configuration under different welding conditions (tool rotational speed, plunge depth, and dwell time). By analyzing the lap-shear tensile load and the fracture surface of the welded joints, it is found that the weld attributes (e.g. weld area and maximum lap-shear tensile load) increase with increasing dwell time, tool rotational speed, and plunging depth. The maximum lap-shear tensile load increases with nanotube loading up to a threshold, followed by a decreasing trend at nanotube loading higher than 1.0 wt.%. It is hypothesized that the bonding mechanism for FSSW of HDPE/MWCNT composites is mainly through the co-crystallization across the interface. When more nanotubes are involved in the welding zone (>1.0 wt.%), saturation of nucleation is reached, the positive effect on the crystallization is vanished, and consequently the overall mechanical properties decrease. Interface failure of the welded joints and bulk fracture originated from the upper coupon within the weld nugget perimeter were identified as the two main failure mechanisms.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128293354","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: 2

Residual Stresses in Bimetallic Weld Joint With Varying Buttering Layer Thickness 不同涂油层厚度双金属接头的残余应力

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6729

Rahul Chhibber, N. Arora, B. K. Dutta

引用次数: 1

Processing-Mechanical Property Relationship of Hollow and Porous Carbon Fibers Fabricated by Coaxial Electrospinning 同轴静电纺丝中空和多孔碳纤维的加工-力学性能关系

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6598

Yijun Chen, Jizhe Cai, J. Boyd, M. Naraghi

{"title":"Processing-Mechanical Property Relationship of Hollow and Porous Carbon Fibers Fabricated by Coaxial Electrospinning","authors":"Yijun Chen, Jizhe Cai, J. Boyd, M. Naraghi","doi":"10.1115/MSEC2018-6598","DOIUrl":"https://doi.org/10.1115/MSEC2018-6598","url":null,"abstract":"High strength hollow carbon fibers with both porous and solid shell were fabricated by a combination of coaxial electrospinning and emulsion electrospinning. In the coaxial electrospinning, a Polyacrylonitrile (PAN)/ Poly(methyl methacrylate) (PMMA)/Dimethylformamide (DMF) emulsion was used to form the porous shell and a PAN/DMF solution was used to form the solid shell. Fiber surface and cross-section morphology was studied by scanning electron microscope (SEM). Mechanical property of the hollow fibers was characterized by single fiber tensile test using microelectromechanical system devices (MEMS). The effect of pores on mechanical performance of the hollow fibers was studied. Hollow carbon fibers with porous and solid shell both showed a brittle fracture behavior. The modulus and strength of the hollow carbon fibers with solid shell was ∼ 76.1 GPa and 2.04 GPa, respectively. For the hollow carbon fibers with porous shell, the porosity led to ∼ 35 % reduction in strength. The porous fibers with the mediocre strength measured here open new horizons for combining structural functionality with energy storage, in so-called structural batteries.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130194672","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