Ultrasonic Cavitation Peening of Stainless Steel and Nickel Alloy

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Yibo Gao ◽  
Benxin Wu ◽  
Ze Liu ◽  
Yun Zhou ◽  
Ninggang Shen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Nickel Alloy ◽  
Vibration Amplitude ◽  
Surface Hardness ◽  
Surface Profile ◽  
Ultrasonic Cavitation ◽  
Surface Microhardness ◽  
Workpiece Surface ◽  
Different Depths

Ultrasonic cavitation peening is a peening process utilizing the high pressure induced by ultrasonic cavitation in liquids (typically water). In this paper, ultrasonic cavitation peening on stainless steel and nickel alloy has been studied. The workpiece surface microhardness, the microhardness variation at different depths, the workpiece surface profile, roughness, and morphology have been measured or observed. It has been found that for the studied situations, ultrasonic cavitation peening (at a sufficiently high horn vibration amplitude) can obviously enhance the workpiece surface hardness without significantly increasing the surface roughness. Under the investigated conditions, a surface layer of more than around 50 μm has been hardened under a horn vibration amplitude of ∼20 μm.

Ultrasonic Cavitation Peening of Stainless Steel and Nickel Alloy

2013 ◽  
Author(s):  
Yibo Gao ◽  
Benxin Wu ◽  
Ze Liu ◽  
Yun Zhou
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Nickel Alloy ◽  
Vibration Amplitude ◽  
Surface Hardness ◽  
Ultrasonic Cavitation ◽  
Workpiece Surface ◽  
Oxygen Contamination ◽  
Scanning Electron

Ultrasonic cavitation peening is a peening process utilizing the high pressure induced by ultrasonic cavitation in liquids (typically water). However, the relevant previous investigations in the literature have been limited. In this paper, ultrasonic cavitation peening on stainless steel and nickel alloy has been studied, including the observation or characterization of the surface hardness, morphology, profile, roughness and oxygen contamination of treated workpiece samples. It has been found that for the studied situations, ultrasonic cavitation peening (at a sufficiently high horn vibration amplitude) can obviously enhance the workpiece surface hardness without significantly increasing the surface roughness, changing surface morphology observed by scanning electron microscope (SEM), or contaminating the surface by oxygen.

INVESTIGATION OF SINGLE-POINT DRESSING OVERLAP RATIO AND DIAMOND-ROLL DRESSING INTERFERENCE ANGLE ON SURFACE ROUGHNESS IN GRINDING

2010 ◽  
Vol 34 (2) ◽  
pp. 295-308 ◽  
Author(s):  
Akram Saad ◽  
Robert Bauer ◽  
Andrew Warkentin
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Empirical Model ◽  
Material Removal ◽  
Removal Rate ◽  
Single Point ◽  
Experimental Conditions ◽  
Workpiece Surface ◽  
Different Depths ◽  
Overlap Ratio

This paper investigates the effect of both single-point and diamond-roll dressing techniques on the workpiece surface roughness in grinding. Two empirical surface roughness models are studied – one that incorporates single-point dressing parameters, and another that incorporates diamond-roll dressing parameters. For the experimental conditions used in this research, the corresponding empirical model coefficients are found to have a linear relationship with the inverse of the overlap ratio for single-point dressing and the interference angle for diamond-roll dressing. The resulting workpiece surface roughness models are then experimentally validated for different depths of cut, workpiece speeds and dressing conditions. In addition, the models are used to derive a relationship between overlap ratio for single-point dressing, and interference angle for diamond-roll dressing such that both dressing techniques produce a similar surface finish for a given material removal rate.

Surface Roughness and Initial Pressure Effect on Superplastically Carburized Duplex Stainless Steel

2010 ◽  
Vol 297-301 ◽  
pp. 227-232 ◽  
Author(s):  
Sharidah Azuar Abdul Azis ◽  
Iswadi Jauhari ◽  
Nik Rozlin Nik Masdek ◽  
Nor Wahida Ahamad ◽  
Hiroyuki Ogiyama
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Hardness ◽  
Direct Interaction ◽  
Initial Pressure ◽  
Pressure Effects ◽  
Superplastic Material ◽  
Coarse Microstructure ◽  
Effect Of Surface

Superplastic carburizing (SPC) is a carburizing process that combines carburizing with superplastic deformation. Since SPC involves direct interaction between the superplastically deformed surface and the solid carbon medium, the effect of surface roughness on the process cannot be disregarded. This paper presents the study of surface roughness and initial pressure effects on superplastic carburizing of duplex stainless steel (DSS). SPC was conducted under four different surface roughness (Ra) conditions of 0.9, 0.3, 0.1 and 0.03 μm. The microstructure, surface hardness, and carburized layer thickness were studied. Comparisons were also done on non-superplastic material which has a coarse microstructure. The results showed that the surface roughness strongly affected the properties of the superplastically carburized duplex stainless steel while its effects on the non-superplastic material were not that obvious.

Prediction Models for Energy Consumption and Surface Quality in Stainless Steel Milling

2021 ◽  
Author(s):  
Shuo Yu ◽  
Guoyong Zhao ◽  
Chunxiao Li ◽  
Shuang Xu ◽  
Zhifu Zheng
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Energy Consumption ◽  
Tool Wear ◽  
Surface Quality ◽  
Specific Energy ◽  
Prediction Models ◽  
Specific Energy Consumption ◽  
Surface Hardness ◽  
Machined Surface

Abstract Stainless steel is a kind of difficult-to-machine material, and the work hardening in milling easily leads to high energy consumption and poor surface quality. Thus, the influence of machined surface hardness on energy consumption and surface quality cannot be ignored. To solve this problem, the prediction models for machine tool specific energy consumption and surface roughness are developed with tool wear and machined surface hardness considered firstly. Then, the validity of the models is verified through AISI 304 stainless steel milling experiments. The results show that the prediction accuracy of the machine tool specific energy consumption model can reach 98.7%, and the roughness model can reach 96.8%. Later, according to the developed prediction models, the influence of milling parameters, surface hardness, and tool wear on the machine specific energy consumption and surface roughness is studied. Results show that in stainless steel milling, the most significant parameters for surface roughness is the machined surface hardness, while that for energy consumption is the feed per tooth. The machine specific energy consumption increases linearly with the increase of the tool wear and the machined surface hardness gradually. The proposed models are helpful to optimize the process parameters for high efficiency and high quality machining of stainless steel.

The Effect of Surface Roughness on Sursulf, Gas and Plasma Nitride Coatings on Austenitic Stainless Steel Type AISI 316LN

2011 ◽  
Vol 110-116 ◽  
pp. 758-763 ◽  
Author(s):  
A. Devaraju ◽  
A. Elayaperumal
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Adhesion Strength ◽  
Coating Thickness ◽  
Surface Hardness ◽  
Ground Sample ◽  
Steel Type ◽  
316Ln Ss ◽  
Type Aisi

Austenitic stainless steel type AISI 316LN (316LN SS) material has been nitrided by three different nitride techniques such as Sursulf, Gas and Plasma nitriding. The 316LN SS samples have been prepared with two different surface roughnesses. The effects of surface roughness on nitriding with respect to formation of coating, case depth, increase in surface hardness and coating adhesion strength have been evaluated. The coating thickness was high for mirror polished samples than ground samples for all nitriding techniques. The coating thickness was very high (76.5µm) for plasma nitrided (PN) mirror polished sample and thin (22.5µm) & uneven for Sursulf Nitrided (SSN) ground sample. However, the SSN sample produces high surface hardness and good adhesion strength than PN. The Gas nitided (GN) sample produces the moderate result between SSN and PN.

Surface Hardening of Ceramic Oxide and Metal Alloy Single Crystals by Ultrasonic Cavitation

1993 ◽  
Vol 318 ◽  
Author(s):  
James R. Brewster ◽  
Y. Powell-Friend ◽  
L. A. Boatner
Keyword(s):  
Stainless Steel ◽  
Single Crystal ◽  
Single Crystals ◽  
Ultrasonic Treatment ◽  
Surface Hardening ◽  
Surface Hardness ◽  
Ultrasonic Cavitation ◽  
Indentation Hardness ◽  
Damage And Failure ◽  
Micro Indentation

ABSTRACTCavitation effects have long been considered to be undesirable phenomena that resulted in the damage and failure of metallic components. In the present work, we establish that, in fact, controlled applications of ultrasonic cavitation phenomena can be used to enhance the surface properties of both ceramics and metals. Polished (100) surfaces of single-crystal MgO and single crystals of 70%Fe-15%Ni-15%Cr (stainless-steel) were subjected to ultrasonically induced cavitation by exposure to 20 kHz excitations (at ∼ 100 W/cm2) in isopropanol. Knoop micro-indentation hardness measurements on untreated and ultrasonically treated areas of the surfaces revealed a hardening that increased with the duration of the ultrasonic treatment up to a saturation level. Relative increases in the surface hardness of up to 30% in the case of MgO and ∼250% in the case of Fe-Ni-Cr were obtained. It was found that the rate of hardening was not uniform over the surface but was more rapid on those portions of the surface that were directly under the edge of the ultrasonically vibrating horn tip.

scholarly journals Evaluation of Surface Microhardness and Abrasion Resistance of Two Dental Glass Ionomer Cement Materials after Radiant Heat Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Dimitrios Dionysopoulos ◽  
Kosmas Tolidis ◽  
Thrasyvoulos Sfeikos ◽  
Christina Karanasiou ◽  
Xanthippi Parisi
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Abrasion Resistance ◽  
Glass Ionomer Cement ◽  
Surface Hardness ◽  
Radiant Heat ◽  
Surface Microhardness ◽  
Surface Loss ◽  
Group 2 ◽  
Vertical Scanning Interferometry

The aim of this study was to evaluate the effect of a radiant heat treatment using a dental LED unit on the surface microhardness and abrasion resistance after toothbrushing simulation of two conventional GIC materials. Two conventional GIC materials were studied in this investigation: Ketac Fil Plus Aplicap and IonoStar Molar. Twenty disk-shaped specimens (n=10) were prepared of each GIC (7 mm × 2 mm) using cylindrical Teflon molds. Group 1 specimens were left in the mold to set without any treatment, while in Group 2 after placement in the mold the specimens were irradiated for 60 sec at the top surface using a LED light-curing unit. Toothbrushing simulation was carried out using a commercial electric toothbrush which was fixed in a constructed device that allowed the heads of the brushes to be aligned parallel to the surface of the specimens and to control the pressure, with the following parameters: load of the toothbrush standardized at 250 g, medium hardness toothbrush head, and rotation sense changing every 30 sec. The toothbrush abrasion test mechanism, based on a 1.25-Hz frequency for 10,000 cycles, was equivalent to 800 days (~2 years) of brushing. Surface hardness, surface roughness, and surface loss after abrasive procedure were evaluated using Vickers method and Vertical Scanning Interferometry. Data were statistically analyzed using one-way ANOVA and Tukey’s post hoc test (a=0.05). The radiant heat treatment increased the surface microhardness and decreased surface roughness and surface loss after abrasive procedures of both the tested GIC materials but to different extent. Between the tested GIC materials there were significant differences in their tested properties (p<0.05).

Study of the Effect of MoS2 and PTFE Based Coatings on Adhesive Wear of Stainless Steel

2013 ◽  
Vol 302 ◽  
pp. 216-222 ◽  
Author(s):  
Thanit Thana ◽  
Karuna Tuchinda
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Adhesion Strength ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Load Capacity ◽  
Steel Substrate ◽  
Surface Hardness ◽  
Ptfe Film ◽  
The Individual

this paper, the adhesive wear characterization of MoS2, PTFE and mixture of MoS2 and PTFE films coated on stainless steel substrate, i.e. SUS440C, have been studied. The films were deposited by dry spray techniquecommercially available domestically. The films properties which are surface hardness, film thickness, surface roughness and adhesion strength were investigated. The thickness and the surface hardness of the films were approx. 7, 6.8 and 6.2 µm and 0.1,0,8 and 0.4GPa for MoS2, PTFE and the mixture of MoS2 and PTFE, respectively.The surface roughness of MoS2, PTFEwerefound to be similar with the value of Ra of approx. 0.302-0.303 µm. The mixture of MoS2 and PTFE showed smoother surface with the surface roughness (Ra) of approx.0.260µm. The PTFE film has shown better adhesion strength with higher critical load for first failure and full delamination. However, the failure pattern observed suggested lower severity of surface damage.Theresults fromtribologicaltests between the coated SUS440C ball and the SUS304 discshowedstrong effect of the coating on adhesive wear behavior of the contacting systems.For MoS2coated surface, the coatingsurface peeled offgraduallyuntil the surface ofthe substrate was revealed. Whereas, the PTFEcoated surface had delaminated immediately once in contact resulting in plate liked wear debris.The mixture ofMoS2 andPTFE haslower thefriction coefficient compared to the individual coating. Thewearbehavior found on the mixture of MoS2 and PTFE coated surface had similar characteristic to those found on surfacecoatingwithMoS2. It also showed lower wear occurrences with better appearance due to tearing wearat the edges of the worn suggesting better load capacity of the mixed film than the individual PTFE coating.

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