scholarly journals Study on Fatigue Life of Heat-treated Aluminium alloy coated with Castor oil.

2018 ◽  
Vol 172 ◽  
pp. 03004
Author(s):  
A. Sivasubramanian ◽  
T.S. Kirubasankar ◽  
S. Vinoth kumar
Keyword(s):  
Heat Treatment ◽  
Fatigue Life ◽  
Aluminium Alloy ◽  
Castor Oil ◽  
Cyclic Load ◽  
Heat Treated ◽  
Al 7075 ◽  
Number Of Cycles ◽  
Uncoated Specimen ◽  
Scanning Electron

This paper involves the study of fatigue life of coated aluminium alloy Al 7075-T651 that is heat-treated under 100oC soaked in castor oil for three days. The specimen after heat treatment is subjected to fatigue test using rotary bending machine for number of cycles to fail under cyclic load of 15kgf, 25Kgf, and 50kgf.The life of the specimen is found and compared with uncoated specimen and improved life in number of cycle is noticed. The crack propagation and its type is analysed using scanning electron microscope for knowing the point of fracture and its initiation to failure.

S.E.M. Fractography of Ultrasonic Fatigue in L65 Aluminum Alloy

1975 ◽  
Vol 33 ◽  
pp. 44-45
Author(s):  
K C H Ashley ◽  
R W Ditchfield ◽  
G A McD Downie
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Fracture Surfaces ◽  
Hardened Alloy ◽  
Heat Treated ◽  
Ultrasonic Fatigue ◽  
Fatigue Endurance ◽  
Mean Strain ◽  
Scanning Electron

An aluminium alloy (L65) was fatigue tested in a longitudinal tension compression mode at a frequency of 20 kHz with a mean strain of 1.65.10-3. The specimens used were simple cylinderical rods of fully hardened, solution heat treated or fully annealed aluminium alloy. The effects of the variation in heat treatment on the nature of fracture were investigated by examining the fracture surfaces of these specimens in a Cambridge S4-10 scanning electron microscope.The fracture surfaces of the fully hardened alloy exhibited the characteristics of cleavage fracture (Stage I and Stage II cracking) in agreement with Forsyth's theories. Occasionally these specimens underwent an unusual mode of centre initiated failure for which the fatigue endurance was greater than that experienced following the surface initiation in similar specimens.

Effect of Double-Step Solution Treatment on Rejuvenation Heat Treated Microstructure of IN-738 Superalloy

2020 ◽  
Vol 856 ◽  
pp. 36-42
Author(s):  
Chuleeporn Paa-Rai
Keyword(s):  
Heat Treatment ◽  
Image Analysis ◽  
Electron Microscope ◽  
Solution Treatment ◽  
Single Step ◽  
Double Step ◽  
Heat Treated ◽  
Cast Superalloy ◽  
Scanning Electron

This work investigates the effect of rejuvenation heat treatment, with double-step solution treatment at the temperature from 1150 °C to 1200 °C, on the recovered microstructure of IN-738 cast superalloy. The superalloy has been long-term exposed as a turbine blade in a gas turbine prior to this study. After double solution treatment and aging at 845 °C for 12 h and 24 h, the recovered microstructures were examined by using a scanning electron microscope. Coarse γ΄ particles, that have presented in damaged microstructures, could not be observed in the samples after the rejuvenation heat treatment. In addition, the image analysis illustrates that the reprecipitated γ΄ particles in the samples with double-step solution treatments increase significantly in sizes during aging than that in the samples with the single-step solution treatment. Furthermore, the measurement of the samples hardness presents that the as-receive sample hardness is improved after rejuvenation heat treatment studied in this work.

The Effect of Heat Treatment on Fatigue and Mechanical Properties of 6061 Aluminium Alloy

2014 ◽  
Vol 699 ◽  
pp. 227-232
Author(s):  
Nurulhilmi Zaiedah Nasir ◽  
Mohd Ahadlin Mohd Daud ◽  
Mohd Zulkefli Selamat ◽  
Ahmad Rivai ◽  
Sivakumar Dhar Malingam
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Strength ◽  
Aluminium Alloy ◽  
Aging Treatment ◽  
Hardness Measurement ◽  
Hardness Tester ◽  
Quenching Media ◽  
Heat Treated ◽  
6061 Aluminium Alloy

This paper investigated the effect of heat treatment on mechanical properties and microstructure of 6061 aluminium alloy. The aluminium alloys were examined in the heat treated conditions, using different quenching media, water and oil. The alloy was solution heat treated at temperature of 529oC for one, three and five hour respectively. Aging treatment was carried out at temperature of 160oC which is assumed to be the best temperature for ageing process. Hardness measurement was carried out using a Brinell Hardness Tester Machine. The results shows hardness and impact strength are inversely proportional to each other, as the hardness of 6061 aluminium alloy decreases and impact strength increases.

Analysis of Strain Hardening Behaviour of Cast Aluminium Alloy 354 Subjected to Artificial Ageing at Various Temperatures

2013 ◽  
Vol 856 ◽  
pp. 231-235 ◽  
Author(s):  
Aditya Eswar ◽  
Arnav Gupta ◽  
G. Dinesh Babu ◽  
M. Nageswara Rao
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Strain Hardening ◽  
Automotive Industry ◽  
Mechanical Behaviour ◽  
Artificial Ageing ◽  
Cast Aluminium ◽  
Heat Treated ◽  
Lower Strain ◽  
Wide Scale

Automotive industry makes wide scale use of cast aluminium alloy 354 in the production of crucial components, such as compressor wheels for turbochargers. The compressor wheels undergo T61 heat treatment, involving artificial ageing at 188°C. This study focuses on the possible improvement of the mechanical behaviour of the components by subjecting them to modified heat treatments involving usage of lower artificial ageing temperatures (160, 171 and 177°C). A comparative analysis of tensile properties and strain hardening behaviour has been carried out with different artificial ageing temperatures. Results showed that the heat treatment routinely employed by the industry (aged at 188°C) leads to overageing, thereby resulting in relatively inferior mechanical properties and lower strain hardening rates as compared to the samples heat treated at lower artificial ageing temperatures. It is concluded that lowering of the artificial ageing temperature can lead to a superior state of components with respect to mechanical behaviour.

Mechanical properties of heat-treated cellulose nanofiber-reinforced polyvinyl alcohol nanocomposite

2016 ◽  
Vol 51 (14) ◽  
pp. 1971-1977 ◽  
Author(s):  
NH Noor Mohamed ◽  
Hitoshi Takagi ◽  
Antonio N Nakagaito
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Tensile Tests ◽  
Cellulose Nanofiber ◽  
Heat Treated ◽  
Scanning Electron ◽  
Polyvinyl Alcohol Films

The mechanical properties of cellulose nanofiber-reinforced polyvinyl alcohol composite were studied. Neat polyvinyl alcohol films, cellulose nanofiber sheets, and their nanocomposites containing cellulose nanofiber weight ratios of 5, 15, 30, 40, 45, 50 and 80 wt% were fabricated. Heat treatment by hot pressing at 180℃ was conducted on the specimens to study its effect to the mechanical properties and the results were compared with the non heat-treated specimens. Morphology of the composites was studied by scanning electron microscopy and the mechanical properties were evaluated by means of tensile tests. The results showed that increase of cellulose nanofiber content from 5 wt% to 80 wt% has increased the tensile strength of the composites up to 180 MPa, with cellulose nanofiber content higher than 40 wt% yielding higher tensile strength. The heat-treated specimens exhibited higher tensile strength compared to those of untreated specimens.

Assessment of the Corrosion Behavior of a Sintered Al-Cu-Mg Alloy in Aeronautical Environments as a Function of the Heat Treatment

2007 ◽  
Vol 534-536 ◽  
pp. 497-500
Author(s):  
S. Sánchez-Majado ◽  
José M. Torralba ◽  
Antonia Jiménez-Morales
Keyword(s):  
Heat Treatment ◽  
Corrosion Behaviour ◽  
Sintered Sample ◽  
Atmospheric Environment ◽  
Corrosion Performance ◽  
Energy Dispersive Analysis ◽  
Prealloyed Powder ◽  
X Ray ◽  
Heat Treated ◽  
Scanning Electron

In the present work it has been studied the corrosion performance of a powder metallurgical aluminum alloy in aeronautical environments as a function of heat treatment. For this purpose an Al-Cu-Mg prealloyed powder was uniaxially pressed at 600 MPa followed by sintering at 590°C in nitrogen for 60 minutes. Subsequently sintered samples were heat treated to the T4 and T6 state. Corrosion behaviour was assessed by means of potentiodynamic polarization (PPT) in Dilute Harrison solution (DHS), which is considered to closely emulate the atmospheric environment for aircraft. PPT results for the equivalent wrought counterpart, AA2024 in its typical heat treatment for aeronautical applications T3, are also presented for comparison. The microstructure of each sample has been examined by Scanning Electron Microscopy (SEM) and Energy-Dispersive analysis of X-ray (EDX). Similar corrosion performance was observed for both the as sintered sample and its equivalent wrought counterpart, while corrosion resistance of the PM materials was improved by the heat treatment, especially in the T4 state.

Hot Dip Aluminizing of 9Cr-1Mo Steels and their Heat Treatment

2015 ◽  
Vol 830-831 ◽  
pp. 143-146
Author(s):  
Jalpa Patel ◽  
Prashanth Huilgol ◽  
Nirav Jamnapura ◽  
K. Udaya Bhat
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Solid Solution ◽  
Reaction Layer ◽  
Treatment Duration ◽  
Substrate Material ◽  
X Ray ◽  
Heat Treated ◽  
Heat Treatment Duration ◽  
Scanning Electron

Coupons of 9Cr-1Mo steels of type SA 387 Grade 9 class 2 were hot dip aluminized using Al bath at a temperature of 700 °C for 30 seconds. The samples were further heat treated at 750 °C for durations of 1, 3 and 5 hours, respectively. The samples were characterized using X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy. The investigation showed that as coated samples contain an aluminum top coat, a reaction layer and substrate material. Within the reaction layer, two distinct regions corresponding to Fe2Al5 and Fe4Al13 were identified. Chromium up to 2 at% was observed. After heat treatment Al coat was not existing. Two distinct layers, corresponding to a thick Fe2Al5 and a thin FeAl were observed at shorter heat treatment duration. Under longer heat treatment durations, multiple phases, namely, Fe2Al5, FeAl, Fe3Al and solid solution of Al in Fe were observed.

Investigation on the Strain Behaviour of a Precipitation-Hardenable Aluminium Alloy through a Temperature Gradient Based Heat Treatment

2015 ◽  
Vol 639 ◽  
pp. 361-368 ◽  
Author(s):  
Gabriella di Michele ◽  
Pasquale Guglielmi ◽  
Gianfranco Palumbo ◽  
Donato Sorgente
Keyword(s):  
Heat Treatment ◽  
Temperature Gradient ◽  
Aluminium Alloy ◽  
Room Temperature ◽  
Tensile Tests ◽  
Gauge Length ◽  
Image Correlation ◽  
Experimental Campaign ◽  
Strain Behaviour ◽  
Heat Treated

In this work the strain behaviour of the heat-treated 6xxx series aluminium alloy AC170PX is investigated by a not conventional approach. Thanks to the low density combined with good mechanical properties, this aluminium alloy is often adopted for automotive applications. Despite these advantages, its formability at room temperature is low. In order to overcome this limit, a distribution of the material properties can be achieved by a local heat treatment (Tailored Heat Treated Blanks). In this context, to evaluate the effects of those parameters mainly affecting the precipitation hardening (aging temperature and aging time), a first experimental campaign was conducted using conventional furnace heat treatment in different conditions . Tensile tests were run with the aim of determining the flow and the aging curves of the heat treated specimens. Starting from these results, a not uniform heat treatment was designed using a Gleeble physical simulator Heat treatments based on a temperature gradient along the sample were performed. Then, tensile tests of the so heated specimens were carried out at room temperature. Through a digital image correlation system both the distribution and the evolution of the strain along the gauge length of the specimen were analysed in order to obtain the hardening/softening working conditions related to a specific heating cycle. These results were validated by the comparison with the data obtained from the first experimental campaign.

scholarly journals Influence of Ca, Sb and heat treatment on AlSi9CuMnNi alloy in frame of their properties from view of machining

2018 ◽  
Vol 244 ◽  
pp. 02003 ◽  
Author(s):  
Nataša Náprstková ◽  
Pavel Kraus ◽  
Jan Sviantek ◽  
Tuong Nguyen Van
Keyword(s):  
Heat Treatment ◽  
Tool Wear ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Mechanical Engineering ◽  
Metal Alloys ◽  
Heat Treated ◽  
Cutting Inserts

Treatment of metal alloys is one of the ways to affect the quality and properties of the material At the Faculty of Mechanical Engineering of the Jan Evangelista Purkyně University in Ústí nad Labem, one part of the research consists of searching for the influence of various modifying and inoculating elements on selected aluminium alloys. One of the alloys undergoing the present research is the hardening aluminium alloy AlSi9CuMnNi. The article describes one from these experiments, than AlSi9CuMnNi alloy was modified with various amounts of calcium (0.05, 0.1 and 0.15 wt. % Ca) and 0.2 wt. % Sb. The alloy without modification and with 0.2 wt. % Sb was heat-treated, too. In the experiment were made three castings for each type of alloy. Experimental samples were evaluated form view of final hardness, were machined, too and there were analysed tool wear of using cutting inserts and final ship from machining (turning). Presented experiments are part of the extensive research undertaken at FME at JEPU in Ústí nad Labem.

Precipitation Behaviour and Mechanical Properties during Short-Term Heat Treatment for Tailor Heat Treated Profiles (THTP) of Aluminium Alloy 6060 T4

2016 ◽  
Vol 877 ◽  
pp. 400-406 ◽  
Author(s):  
Hannes Fröck ◽  
Matthias Graser ◽  
Benjamin Milkereit ◽  
Michael Reich ◽  
Michael Lechner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminium Alloy ◽  
Heat Treatments ◽  
Maximum Temperature ◽  
Short Term ◽  
Scanning Calorimetry ◽  
Heat Treated ◽  
Precipitation Behaviour ◽  
Dissolution And Precipitation

Precipitation hardening aluminium alloys are widely used for automotive applications. To enhance the application of aluminium profiles, improved formability is needed. Tailor Heat Treated Profiles (THTP) with locally different material properties attempt to increase formability e.g. in bending processes. Tailoring of local properties is obtained by a local short-term heat treatment, dissolving the initial precipitate state (retrogression) and still allowing subsequent ageing. In the present study, the dissolution and precipitation behaviour of the aluminium alloy EN AW-6060 T4 was investigated during heating with differential scanning calorimetry (DSC). Heating curves from 20 to 600 °C with heating rates of 0.01 up to 5 K/s were recorded. Interrupted heat treatments with different maximum temperatures were performed in a deformation dilatometer. Immediately afterwards, tensile tests were carried out at room temperature. The course of the recorded mechanical properties as a function of the maximum temperature is discussed with regard to the dissolution and precipitation behaviour during heating. Finally, the aging behaviour of the investigated alloy was recorded after different typical short-term heat treatments and is discussed with reference to the DSC‐curves. The correlation of the microstructure and the mechanical properties enables the derivation of optimal parameters for the development of THTP through a local softening.

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