scholarly journals Optimization of the Preparation Parameters of High-Strength Nickel Layers by Electrodeposition on Mild Steel Substrates

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5461
Author(s):  
Dongai Wang ◽  
Feihui Li ◽  
Yan Shi ◽  
Meihua Liu ◽  
Bin Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Current Density ◽  
Modulus Of Elasticity ◽  
Mechanical Test ◽  
High Strength ◽  
Test System ◽  
Test Method ◽  
Nickel Plating ◽  
Plating Solution

The electrodeposition process parameters were optimized for the acquisition of high-strength monolithic nickel layers on Q235A substrates based on the Watts nickel plating solution using the DC electrodeposition method. Based on the study of the electrochemical polarization behavior of nickel ions in Watts’ plating solution, 16 experimental protocols were selected according to the orthogonal test method. The residual stress, microhardness, modulus of elasticity, and surface roughness of the nickel plating were tested by X-ray diffractometer, nano-mechanical test system, and surface profilometer, respectively, to investigate the influence of current density, temperature, and PH on the mechanical properties of nickel plating, so as to determine the best process solution for the preparation of high-strength nickel plating. The results of the study show that the mechanical properties of the nickel deposits electrodeposited onto Q235A are optimized when plating at a current density of 3 A/dm2, a bath temperature of 45 °C, and a pH of 3.5. The nickel-plated layer has a minimum grain size of 34.8 nm, a microhardness of 3.86 GPa, a modulus of elasticity of 238 GPa, and a surface roughness Ra of 0.182 μm.

scholarly journals Effect of Nanodiamond Concentration and the Current Density of the Electrolyte on the Texture and Mechanical Properties of Ni/Nanodiamond Composite Coatings Produced by Electrodeposition

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1105
Author(s):  
Meihua Liu ◽  
Hongnan Liu ◽  
Dongai Wang ◽  
Bing Liu ◽  
Yan Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Composite Coating ◽  
Current Density ◽  
Crystal Orientation ◽  
Mechanical Test ◽  
Composite Coatings ◽  
Test System ◽  
Average Grain Size ◽  
Plating Solution

An Ni/nanodiamond composite coating was deposited on carbon steel in a traditional Watt’s solution without additives via direct current (DC) electroplating. The effects of the nanodiamond concentration and current density in the plating solution on the morphology, grain size, and texture of the Ni/nanodiamond composite coating were observed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The distribution of the nanodiamond particles in the composite coating was investigated by Raman spectra and SEM. The mechanical properties of the composite coating, such as its elastic modulus and hardness, were examined using a Nano Indenter XP nanometer mechanical test system. The coefficient of friction was tested using a Universal Micro-Tribotester. The results demonstrated that the preferential orientation of the Ni/nanodiamond composite coating varied from the (111) crystal orientation of the pure nickel coating to the (200) crystal orientation. When the nanodiamond concentration in the plating solution was 8.0 g/L and the current density was 3.0 A/dm2, the hardness of the composite coating reached the maximum value of 5.302 GPa and the friction factor was maintained at around 0.1. The average grain size of the composite coating was reduced to 20.4 nm.

The Study in Mechanical Properties of Non Uniform Paper Stuff Material by Digit Image Frequency Domination Correlation Method

2012 ◽  
Vol 486 ◽  
pp. 362-367
Author(s):  
Ri Cao Wang ◽  
Xin Hua Ji ◽  
Xiao Chuan Zhang
Keyword(s):  
Mechanical Properties ◽  
Correlation Method ◽  
Ccd Camera ◽  
Compression Molding ◽  
Test System ◽  
Test Method ◽  
Paper Pulp ◽  
Molding Material ◽  
Surface Image ◽  
Image Frequency

The paper pulp compression molding material is one of the most commonly used materials in packing industry. Their mechanical properties attract attentions from professional visitors and researchers. It is a difficult work to test the mechanical properties as the paper pulps are thin, anisotropic and sometimes wet. To spray ink spots with the surface of the specimens is not allowed either. The digit image frequency correlation method (DIFC) is presented in the paper, the information carrier of the displacement is the nature texture on the tested surface. Image acquiring and analysis are accomplished by the CCD camera and computer. From the displacement field strain distributions were obtained and the mechanical properties of the paper pulp compression molding material were evaluated. The test system is simple and the sensitivity is adjustable. DIFC is approved a suitable test method for paper pulp compression molding material.

Strain Aging Effects in High Strength Line Pipe Materials

2008 ◽  
Author(s):  
Da-Ming Duan ◽  
Joe Zhou ◽  
Brian Rothwell ◽  
David Horsley ◽  
Nick Pussegoda
Keyword(s):  
Mechanical Properties ◽  
Strain Aging ◽  
Mechanical Test ◽  
High Strength ◽  
Parent Material ◽  
Pipe Material ◽  
Aging Effects ◽  
Aging Behavior ◽  
Test Procedures ◽  
Line Pipe

Strain aging behavior can occur in almost all steels, including micro-alloyed steels used in high-strength pipelines. The direct effects of strain aging on mechanical properties can include increased hardness, yield strength and tensile strength, and reduced ductility and toughness. Strain aging may take place in processes where the pipe material experiences thermal cycles, such as coating, welding and in-service heating, and may occur with or without additional plastic strain. The changes of material mechanical properties could seriously challenge the design principles and methodologies, so that these aging effects need to be taken into account. This is especially important for pipelines expected to see deformation-controlled loading conditions. This is not only because the difference in strain aging effects between a weld and the parent material can easily change the strength overmatch condition of the weld, leading to unpredictable girth weld flaw tolerance, but also because the return of Lu¨ders behavior on the stress-strain curves of these materials significantly reduces the pipe buckling load resistance. In addition, any change in fracture resistance due to strain aging may impact the fracture control design practice, particularly if the pipe material may be expected to experience plastic deformation during service. In this paper, a brief review of strain aging behavior in steels is presented, with an emphasis on the effects on the mechanical properties and toughness of three high-strength line pipe steels. Material strain aging mechanical test procedures of three high grade pipes will be described and the test results will be discussed.

Comparison of fracture toughness values of normal and high strength concrete determined by three point bend and modified disk-shaped compact tension specimens

2017 ◽  
Author(s):  
Stanislav Seitl ◽  
José D. Ríos ◽  
Hector Cifuentes
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Strength Concrete ◽  
High Strength ◽  
Compact Tension ◽  
Tension Test ◽  
Test Method ◽  
Strength Concrete ◽  
Compact Tension Test ◽  
Point Bend

The modified disk shaped compact tension test is a configuration derived from standard compact tension test that is used for measuring fracture mechanical properties of primarily metallic materials. The compact tension configuration is commonly used for measurement fracture mechanical properties as e.g. fracture toughness, Young’s modulus, work of fracture etc. The modified compact tension tests imply significant modifications of the specimen morphology in order to avoid premature failure. The modified compact tension test is not proper for quasi-brittle materials due to its complicated shape (steel-concrete interface), but it is easily extracted from drill core and we do not need large amount of material for obtaining fracture properties as we need for e.g. three- or four- point bend test. Since it is a new test method, a wide range of tests is needed to be done before it can be applied. In the paper the selected outputs of the experiments performed on normal and high strength concrete will be processed and the values of fracture mechanical parameters will be discussed.

Investigation of selective laser melting process for Cu-5Sn alloy on surface roughness, microstructure and mechanical property

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Peng Yang ◽  
Dingyong He ◽  
Zengjie Wang ◽  
Zhen Tan ◽  
Hanguang Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Surface Roughness ◽  
Selective Laser Melting ◽  
High Strength ◽  
Melting Process ◽  
Scanning Speed ◽  
Laser Melting ◽  
Forming Process ◽  
Content Type

Purpose In this research, the highly dense bulk Cu-5Sn alloy specimens were fabricated using selective laser melting (SLM). This study aims to establish the relationship between laser power (LP), scanning speed (SS) and hatch space (HS) with surface roughness (Ra) and density. To obtain Cu-5Sn alloy formed parts with high strength and low surface roughness. The microstructure and mechanical properties of SLMed Cu-5Sn were investigated. Design/methodology/approach The relative density (RD) was optimized using the response surface method (RSM) and analysis of variance. First, the Ra of SLMed formed specimens was studied to optimize the forming process parameters with a good surface. Then, the dense specimens were studied by ANOVA and the RSM to obtain dense specimens for mechanical property analysis. Findings Dense specimens were obtained by RSM and ANOVA. The tensile properties were compared with the casted specimens. The yield and ultimate strengths increased from 71 and 131 MPa for the cast specimens to 334 and 489 MPa for the SLMed specimens, respectively. The ductility increased significantly from 11% to 23%, due to the refined microstructure of the SLMed specimens, as well as the formation of many twin crystals. Originality/value The Ra, RD and mechanical properties of SLM specimens Cu-5Sn were systematically studied, and the influencing factors were analyzed together. This study provides a theoretical and practical example to improve the surface quality and RD.

Mechanical properties of Ficus vallis-choudae (Delile), a lesser utilized species in Nigeria

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6550-6560
Author(s):  
Lawrence Aguda ◽  
Babatunde Ajayi ◽  
Sylvester Areghan ◽  
Yetunde Olayiwola ◽  
Aina Kehinde ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Bending Strength ◽  
High Strength ◽  
Strength Properties ◽  
Modulus Of Rupture ◽  
Impact Bending ◽  
Timber Market

Declining availability of the prime economic species in the Nigerian timber market has led to the introduction of Lesser-Used Species (LUS) as alternatives. Their acceptability demands information on the technical properties of their wood. The aim of this study was to investigate the mechanical properties of Ficus vallis-choudae to determine its potential for timber. Three mature Ficus vallis-choudae trees were selected and harvested from a free forest area in Ibadan, Oyo State, Nigeria. Samples were collected from the base (10%), middle (50%), and top (90%) along the sampling heights of each tree, which was further partitioned into innerwood, centrewood, and outerwood across the sampling radial position. Investigations were carried out to determine the age, density, moisture content, impact strength, modulus of elasticity, modulus of rupture, compressive strength parallel-to-grain, and shear strength parallel-to-grain. The mean impact bending strength, modulus of rupture, modulus of elasticity, maximum shear strength parallel-to-grain, and maximum compression strength parallel-to-grain for Ficus vallis-choudae at 12% moisture content were 20.4 N/mm2, 85.8 N/mm2, 709 N/mm2, 10.7 N/mm2, and 33.6 N/mm2, respectively. The study found the species to be dense with high strength properties in comparison with well-known timbers used for constructional purposes.

Microstructure and Mechanical Properties of a Multi-Modal Al Alloy with High Strength

2013 ◽  
Vol 745-746 ◽  
pp. 286-292
Author(s):  
Xiao Ning Hao ◽  
Rui Xiao Zheng ◽  
Li Rong Hao ◽  
Han Yang ◽  
Chao Li Ma
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Alloy Powder ◽  
Mechanical Test ◽  
High Strength ◽  
Bulk Sample ◽  
Coarse Grained ◽  
Al Alloy ◽  
Consolidation Process ◽  
Microstructure And Mechanical Properties

Nanocrystalline (NC) Al alloy powder was fabricated by milling 2024 Al alloy powder and Fe-based metallic glass (FMG) particles. The NC Al alloy powder was consolidated into bulk sample by adding a part of atomized coarse-grained (CG) 2024 alloy powder. The microstructure and mechanical properties of powder and consolidated bulk materials were examined by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and mechanical test. It revealed that the FMG particles were uniformly distributed in the NC aluminum alloy powder. In the consolidation process, the grain size increased, and Al2CuMg phase precipitated. The multi-modal Al alloy by consolidation of FMG particles, NC and CG powder, exhibited higher yield strength up to 517 MPa and better plasticity in comparison to the samples without CG powder.

Preparation of Ti-5553 Alloy by Different Extrusion Processes from Elemental Powder Mixtures

2018 ◽  
Vol 770 ◽  
pp. 31-38 ◽  
Author(s):  
Fei Yang ◽  
Brian Gabbitas ◽  
Stiliana Raynova ◽  
Ajit Pal Singh ◽  
Leandro Bolzoni
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Master Alloy ◽  
Powder Compact ◽  
Titanium Powder ◽  
Mechanical Test ◽  
High Strength ◽  
Powder Mixtures ◽  
Good Ductility

Ti-5553 (Ti-5Al-5V-5Mo-3Cr, wt. %) alloy is a recently developed near β titanium alloy and it has a very good hardenability, good ductility and high strength. In this study, we discussed the feasibility of preparing Ti-5553 alloy by different processes from powder mixtures of hydride-dehydride titanium powder, elemental powders and master alloy powders, including (1) direct extrusion of powder compact in argon, (2) extrusion of the vacuum-sintered billet in air and (3) extrusion of the hot-pressed billet in air. XRD, OM and SEM were used to determine the phase constitutions and microstructures of the prepared Ti-5553 alloys, and mechanical test was performed to examine their mechanical properties. The results showed the microstructures and phase constitutions of Ti-5553 alloys were significantly affected by different processes, which resulted in the relevant mechanical properties. The effect of the selected heat treatment on the microstructures and properties of Ti-5553 alloy were investigated as well.

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