scholarly journals Microstructure and Mechanical Properties of Laser Surface-Treated Ti13Nb13Zr Alloy with MWCNTs Coatings

2021 ◽  
Vol 21 (4) ◽  
pp. 5-18
Author(s):  
Beata Majkowska-Marzec ◽  
Joanna Sypniewska
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Carbon Nanotube ◽  
Titanium Alloys ◽  
Cross Sections ◽  
Heat Affected Zone ◽  
Optical Microscope ◽  
Laser Surface ◽  
Nanoindentation Test ◽  
Laser Modification

Abstract Laser surface modification of titanium alloys is one of the main methods of improving the properties of titanium alloys used in implantology. This study investigates the microstructural morphology of a laser-modified surface layer on a Ti13Nb13Zr alloy with and without a carbon nanotube coating deposited by electrophoretic deposition. Laser modification was performed for samples with and without carbon nanotube coating for two different laser powers of 800 W and 900 W and for different scan rates: 3 mm/s or 6 mm/s at 25 Hz, and the pulse duration was 2.25 ms or 3.25 ms. A scanning electron microscope SEM was used to evaluate the surface structure of the modified samples. To observe the heat-affected zones of the individual samples, metallographic samples were taken and observed under an optical microscope. Surface wettability tests were performed using a goniometer. A surface roughness test using a profilograph and a nanoindentation test by NanoTest™ Vantage was also performed. Observations of the microstructure allowed to state that for higher laser powers the surfaces of the samples are more homogeneous without defects, while for lower laser powers the path of the laser beam is clearer and more regular. Examination of the microstructure of the cross-sections indicated that the samples on which the carbon nanotube coating was deposited are characterized by a wider heat affected zone, and for the samples modified at 800 W and a feed rate of 3 mm/s the widest heat affected zone is observed. The wettability tests revealed that all the samples exhibit hydrophilic surfaces and the samples with deposited carbon nanotube coating increase it further. Surface roughness testing showed a significant increase in Ra for the laser-modified samples, and the presence of carbon nanotubes further increased this value. Nanoindentation studies showed that the laser modification and the presence of carbon coating improved the mechanical properties of the samples due to their strength.

Gas metal arc welding of XPF800 steel for automotive industry: Microstructural evaluation and mechanical properties investigation

2021 ◽  
pp. 146442072110567
Author(s):  
Emre Korkmaz ◽  
Cemal Meran
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Automotive Industry ◽  
Heat Affected Zone ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Charpy Impact ◽  
Optical Microscope ◽  
Metal Arc Welding ◽  
Heat Affected Zone Softening

In this study, the effect of gas metal arc welding on the mechanical and microstructure properties of hot-rolled XPF800 steel newly produced by TATA Steel has been investigated. This steel finds its role in the automotive industry as chassis and seating applications. The microstructure transformation during gas metal arc welding has been analyzed using scanning electron microscope, optical microscope, and energy dispersive X-ray spectrometry. Tensile, Charpy impact, and microhardness tests have been implemented to determine the mechanical properties of welded samples. Acceptable welded joints have been obtained using heat input in the range of 0.28–0.46 kJ/mm. It has been found that the base metal hardness of the welded sample is 320 HV0.1. On account of the heat-affected zone softening, the intercritical heat-affected zone hardness values have diminished ∼20% compared to base metal.

Effects of Hydrothermal Treatment on the Phase Transformation, Surface Roughness, and Mechanical Properties of Monolithic Translucent Zirconia

2022 ◽  
Author(s):  
CY Zhang ◽  
C Agingu ◽  
H Yang ◽  
H Cheng ◽  
H Yu
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Phase Transformation ◽  
Flexural Strength ◽  
Hydrothermal Treatment ◽  
Cross Sections ◽  
Monoclinic Phase ◽  
Control Group ◽  
Hydrothermal Aging ◽  
Characteristic Strength

SUMMARY Objectives: This study aimed to investigate the effects of hydrothermal treatment on four types of monolithic, translucent, yttria-stabilized, tetragonal zirconia polycrystals (Y-TZPs). Methods and Materials: Two commercially available Y-TZP brands—SuperfectZir High Translucency (Aidite Technology Co, China) and Katana HT (Kuraray Noritake Dental, Japan) were assessed. For each brand of Y-TZP, materials of four coloring types, including noncolored (NC), colored by staining (CS), precolored (PC), and multilayered (ML) specimens were investigated after hydrothermal aging in an autoclave at 134°C/0.2 MPa for 0 (control group), 5, 10, and 20 hours. The tetragonal-to-monoclinic phase transformation, surface roughness, flexural strength, and structural reliability (Weibull analysis) were measured and statistically analyzed (α=0.05). The subsurface microstructure was analyzed with scanning electron microscopy. Results: The group ML exhibited the lowest flexural strength and Weibull characteristic strength among the four coloring types (p<0.05). Slight increases in the monoclinic phase volume, flexural strength, and Weibull characteristic strength were observed after hydrothermal aging (pall<0.05). Regardless of coloring type, no significant effects of aging on the Weibull modulus or surface roughness were found for the tested materials. Compared with the Katana HT cross-sections, the SuperfectZir High Translucency cross-sections exhibited a similar but thicker transformation zone. Conclusions: The coloring procedure and material type were found to affect the mechanical properties and aging resistance of translucent monolithic Y-TZP ceramics. Regardless of the aging time, the surface roughness of the tested Y-TZP ceramics remained unchanged.

scholarly journals Effect of surface roughness in the determination of the mechanical properties of material using nanoindentation test

Scanning ◽  
2013 ◽  
Vol 36 (1) ◽  
pp. 134-149 ◽  
Author(s):  
Yang Xia ◽  
Maxence Bigerelle ◽  
Julie Marteau ◽  
Pierre-Emmanuel Mazeran ◽  
Salima Bouvier ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Nanoindentation Test ◽  
Effect Of Surface

scholarly journals Heat affected zone analysis of Ti6Al4V after WEDM

Mechanik ◽  
2019 ◽  
Vol 92 (12) ◽  
pp. 833-835
Author(s):  
Dariusz Poroś ◽  
Stanisław Zaborski ◽  
Paweł Karolczak
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Chemical Composition ◽  
Titanium Alloys ◽  
Heat Affected Zone ◽  
Proper Time ◽  
Wire Electrode ◽  
Time Parameters

Perspectives of applications WEDM for cutting titanium alloys are presented. There is space to explore how application of proper time parameters and the material of wire electrode for WEDM of titanium alloys affects the surface roughness, structure, the stress and the chemical composition of the formed surface layer.

The Fabrication and the Properties of Gradient Porous Titanium by Centrifugal Deposition and Sintering

2014 ◽  
Vol 1042 ◽  
pp. 38-43 ◽  
Author(s):  
Guo Jian Cao ◽  
Wan Jiao Xu ◽  
Yi Cheng Feng ◽  
Wan Yong Tang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Pore Structure ◽  
Titanium Alloys ◽  
Porous Titanium ◽  
Optical Microscope ◽  
Vacuum Sintering ◽  
Porous Ti ◽  
Bone Replacement ◽  
Mechanical Compatibility

Gradient-porous Titanium alloys can be applied to manufacturing implants for bone replacement, due to their good biological and mechanical compatibility. In this work, the feasibility of fabricating gradient-porous Titanium by centrifugal deposition and vacuum sintering was investigated. The apparent porosity of the gradient-porous Ti examined by Archimedes method is 56%. And the open pores occupy 89%. The pore structure was observed by an optical microscope. And its porosities at different radius were calculated by image software based on optical microscopic images. In addition, a nanoindentation was employed to characterize the mechanical properties at different radius. The results showed that the porosity of the sample increased with increasing of radius. Besides, both the elastic modulus and hardness changed alone radius with a same trend.

Surface Structure of Epoxy Treated Semantan Bamboo (Gigantochloa scortechinii)

2020 ◽  
Vol 899 ◽  
pp. 193-205
Author(s):  
Nur Faiqa Ismail ◽  
Solehuddin Shuib ◽  
Ahmad Zafir Romli
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Surface Structure ◽  
Natural Fiber ◽  
Cost Effective ◽  
Optical Microscope ◽  
Morphological Properties ◽  
Good Surface ◽  
Structural Applications ◽  
Superior Mechanical Properties

Bamboo is well known as the oldest structural material that possess unique anatomical structure and superior mechanical properties. It has become a subject of interest worldwide and research is being conducted for its structural applications including safety, durability and also mechanical properties. Many studies carried out previously indeed have shown superior strength of bamboo. Most of the research circulate on the mechanical properties improvement using chemical, plasma, enzyme, fungi and nanocellulose coating treatment. However, despite the conventional treatments’ advantages, but they are impractical, costly and it able to change the structure of the treated materials. This study aims to evaluate the morphological properties of untreated and treated of Semantan bamboo culm (Gigantochloa scortechinii) after subjected to a simple and cost-effective epoxy treatment. By using Alicona Infinite Focus 3D profilometer machine, the comparison between the untreated and treated surfaces of bamboo can be obtained under profile surface roughness test. Meanwhile, the depth formation of the treated surfaces also can be obtained by using the same machine under profile form management test. Next, optical microscope was used later to examine the epoxy matrix treatment formation of the untreated and treated bamboo surfaces. The result revealed that the application of epoxy treatment gave a better surface roughness and structure as it treat the bamboo strips and concurrently gave a thin layer of coating to the bamboo strips. The findings of this study suggest that epoxy treatment can be an effective and economical approach to treat natural fiber as it resulting in good surface structure which simultaneously increase the chemical and mechanical interlocking; thus, the bond between matrix and natural fiber become stronger.

Microstructure and Properties of Laser Surface Carburized Titanium and Titanium Alloys

2014 ◽  
Vol 936 ◽  
pp. 1086-1090 ◽  
Author(s):  
Jing Jie Dai ◽  
Cbuan Zhong Chen ◽  
Shou Ying Li ◽  
Lei Zhuang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Titanium Carbide ◽  
Titanium Alloys ◽  
Surface Properties ◽  
High Strength ◽  
Laser Surface ◽  
Practical Applications ◽  
Excellent Corrosion Resistance ◽  
Light Density

Titanium and titanium alloys are widely used in many fields due to their some characteristics such as light density, high strength and excellent corrosion resistance. However, their practical applications are limited by their poor surface mechanical properties. Laser surface carburizing can improve the surface properties of titanium and titanium via the formation of titanium carbide and other reinforcing phases. In this paper, the properties of the alloyed coatings, the growth morphologies and the formation mechanism of titanium carbide are discussed.

Experimental and Computational investigations on the quality characteristics of laser beam machined metal matrix composite reinforced with ZrO2 particles

2018 ◽  
Vol 1 (1) ◽  
pp. 248-267
Author(s):  
Vikas Sharma ◽  
Vinod Kumar
Keyword(s):  
Surface Roughness ◽  
Heat Affected Zone ◽  
Metal Matrix ◽  
Research Work ◽  
Cutting Speed ◽  
Optical Microscope ◽  
Quality Characteristics ◽  
Workpiece Material ◽  
Zone Width ◽  
Input Variables

The research work explores the parametric influence of laser input variables on surface roughness and heat affected zone width. The workpiece material used as metal matrix aluminum 5052 alloy reinforced with ZrO2 particles. The computational analysis has been carried out using finite element method by taking laser power and arc radius profiles as variables. The mathematical model has been generated using Box-Behnken method for the analysis of variance. The machined samples have been analyzed using optical microscope and surface tester for measurement of quality characteristics. It has been analyzed that the effect of interaction of parameters has significant effect on surface roughness and heat affected zone width. Moreover, the influence of laser cutting speed, quantity of reinforced particles and laser cut path profile proved to be significant parameters for quality characteristics. The von-misses stress and temperature values found to be highest in case of complex cutting profiles as compared to linear trajectories.

Sign in / Sign up

Export Citation Format

Share Document