Study of the Effect of DCT and PVD Treatments on the Fatigue Behaviour of AISI 302 Stainless Steel

2009 ◽  
Vol 417-418 ◽  
pp. 49-52 ◽  
Author(s):  
Paolo Baldissera ◽  
Stefano Cavalleri ◽  
Paolo Marcassoli ◽  
Federico Tordini
Keyword(s):  
Stainless Steel ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Cryogenic Treatment ◽  
Fatigue Behaviour ◽  
Combined Effects ◽  
Deep Cryogenic Treatment ◽  
Bending Tests ◽  
Standard Specimens ◽  
Rotating Bending

In this paper the influence of DCT (Deep Cryogenic Treatment) and a CrN arc-deposited PVD (Physical Vapor Deposition) coating on the fatigue behaviour of AISI 302 stainless steel was studied. Rotating bending tests were carried out on standard specimens to evaluate the fatigue limit at 300000 load cycles. The single and the combined effects of the two treatments were investigated by addressing untreated, PVD-coated and both PVD-coated and DC-treated specimens to the tests. All the series of specimens were also tested statically and laboratory analyses including fracture surface SEM observations and hardness measurements were performed.

Deep Cryogenic Treatment: Effects on Mechanical Properties of AISI 302 Stainless Steel and 18NiCrMo5 Carburized Steel

2009 ◽  
Vol 417-418 ◽  
pp. 793-796 ◽  
Author(s):  
Paolo Baldissera ◽  
Cristiana Delprete
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Cryogenic Treatment ◽  
Surface Hardness ◽  
Fatigue Behaviour ◽  
Structural Components ◽  
Deep Cryogenic Treatment ◽  
Carburized Steel

In this paper, the influence of deep cryogenic treatment (DCT) on mechanical properties of two commercial steels is analysed. Hardened AISI 302 stainless steel and 18NiCrMo5 carburized steel specimens were subjected to DCT after standard treatments. For both materials, the fatigue behaviour is a key property considering their usual applications requirements. Surface hardness, tensile properties and axial fatigue resistance of both materials were measured and compared with and without DCT. From the analysis of the experimental results and from their interpretation in the light of the previous literature, some useful indications are obtained about the DCT potential fallout on design and construction of structural components.

scholarly journals Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1088 ◽  
Author(s):  
Cherish Mani ◽  
R Karthikeyan ◽  
Sathish Kannan
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Welded Joints ◽  
Electrochemical Impedance ◽  
Cryogenic Treatment ◽  
Impedance Analysis ◽  
Oil Refining ◽  
Deep Cryogenic Treatment ◽  
Dissimilar Metal ◽  
Monel 400

An attempt was made to study the corrosion behavior of austenitic stainless-steel SS 316L/Monel 400 alloy dissimilar metal welded joints using gas tungsten arc welding. This combination of welded joints is used in re-heaters and heat exchangers in gas processing and oil refining industries. The welded specimens were subjected to post-weld treatments, such as annealing and deep cryogenic treatment. The welded specimens were sectioned into five different parts: SS 316L base, SS 316L HAZ, weld, Monel HAZ, and Monel base. The polarization method and electrochemical impedance analysis were used to analyze the corrosion resistance in a NaCl solution. A polarization graph, Nyquist plot, and Bode plot were constructed for all regions, separately, for the heat-treated and cryo-treated specimens, to analyze the variation in corrosion resistance in different regions, and then the results were compared. To validate the results of electrochemical impedance analysis, scanning electron microscope (SEM) and energy dispersive spectroscope (EDS) analyses were also performed. The results indicated that the cryo-treated specimens have better corrosion resistance when compared to the annealed ones. Weld region on both specimens exhibited better corrosion resistance when compared to other zones.

Bending Fatigue Behavior of 7075-Aluminum Alloy

2018 ◽  
Vol 774 ◽  
pp. 1-6 ◽  
Author(s):  
Emanuele Vincenzo Arcieri ◽  
Sergio Baragetti ◽  
Emanuele Borzini
Keyword(s):  
Aluminum Alloy ◽  
Tribological Properties ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Fatigue Behavior ◽  
The Other ◽  
7075 Aluminum Alloy ◽  
Bending Tests ◽  
Bending Fatigue ◽  
Light Components

Light alloys are a very interesting challenge in order to have light components with high mechanical features. One of these is the 7075 aluminum alloy, which is commonly employed in aeronautic, automotive and maritime fields.On the other hand, the application of a PVD (Physical Vapor Deposition) coating can improve the hardness of the surface and the tribological properties of the component.The effectiveness of these coatings on the fatigue behavior of the sublayer material is not already clear. For this reason, bending tests on uncoated and coated specimens in air were performed in order to evaluate the S-N diagrams

scholarly journals Fatigue Behaviour of Thin Coated Al 7075 Alloy with Low Temperature PVD Coatings

2013 ◽  
Vol 577-578 ◽  
pp. 221-224 ◽  
Author(s):  
Sergio Baragetti ◽  
Riccardo Gerosa ◽  
Francesco Villa
Keyword(s):  
Aluminium Alloys ◽  
Deposition Temperature ◽  
Fatigue Loading ◽  
Fatigue Behaviour ◽  
Pvd Coatings ◽  
Bending Tests ◽  
Al 7075 ◽  
Rotating Bending ◽  
Step Loading ◽  
7075 Alloy

7075-T6 is one of the most performing aluminium alloys, considering its mechanical properties and good fatigue behaviour. In this work the influence of WC/C and DLC PVD coatings on the fatigue behaviour was investigated by rotating bending tests at 2·105cycles. The fatigue behaviour of polished and untreated specimens was considered as reference. In order to decouple the effect of the deposition temperature from the coating one, some uncoated specimens were submitted to the thermal cycles of the WC/C and DLC processes and then tested under fatigue loading. Fatigue life was determined using a step-loading technique. SEM micrographs of the fracture surfaces were taken in order to characterize the fatigue mechanisms of coated and uncoated specimens.

Microstructure Evolution of NiTi Magnetron Sputtered Thin Film on Different Substrates

2020 ◽  
Vol 835 ◽  
pp. 68-74
Author(s):  
Hanan A. Abd El-Fattah ◽  
Iman El-Mahallawi ◽  
Mostafa H. Shazly ◽  
Waleed A. Khalifa
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Stainless Steel ◽  
Microstructure Evolution ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Steel Substrate ◽  
Chemical Vapor ◽  
Optical Absorbance ◽  
Cu Substrates

Understanding the microstructure evolution of metal thin films on various substrates is essential for developing thin films that need specific requirements. The microstructure of thin films has been identified to be related to the mobility of the adatoms during growth. Recently, the theory of non-classical crystallisation of thin films has been introduced to explain the structure formation in chemical vapor deposition (CVD) and physical vapor deposition (PVD) processes. Much work has been conducted on CVD deposited thin films, while little data appears on PVD techniques. The effect of substrate material on the microstructure of the deposited nickel-titanium (NiTi) thin film and its optical absorbance is studied in this work. Three different substrates with identified surface conditions were used to deposit thin films of NiTi in the same chamber under the same processing conditions. The NiTi thin film was deposited using radio frequency (RF) PVD sputtering process on stainless steel (SS), aluminium (Al) and copper (Cu) substrates. The results were analysed in view of state of art structure models and mechanisms. The microstructure was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The optical absorbance was measured by spectrophotometery. The results have shown that the structure and morphology of the grown films have varied in all conditions. Amorphous structures were obtained for Al and Cu substrates, while crystalline structures were obtained for the stainless-steel substrate at the same sputtering conditions.

Thermodynamic Analysis of EB-PVD Preparing SiC Coating

2007 ◽  
Vol 353-358 ◽  
pp. 1663-1666
Author(s):  
Xiao Dong He ◽  
Jian Yi ◽  
Yue Sun ◽  
Yao Li
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Thermodynamic Analysis ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Preliminary Estimation

The process of Electron Beam-Physical Vapor Deposition (EB-PVD) preparing SiC coating by Electron Beam evaporating 3C-SiC ingot on stainless steel (SS) substrate was firstly discussed as a preliminary estimation from thermodynamic viewpoint. The results show that, with the temperature increasing from 2500 to 3400 K, the purity of SiC coating increases from 0.58 to 0.734.

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