Strain Hardening Behaviour of Hipped and Non-Hipped Castings of Aluminium Alloy 354 Subjected to Two-Step Ageing Treatments

2014 ◽  
Vol 906 ◽  
pp. 249-253
Author(s):  
Arnav Gupta ◽  
Aditya Eswar ◽  
G. Dinesh Babu ◽  
M. Nageswara Rao
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Strain Hardening ◽  
Ageing Time ◽  
Single Step ◽  
Second Step ◽  
Light Weight ◽  
Cast Aluminium ◽  
Treatment Analysis ◽  
Strain Hardening Rate

Cast aluminium alloys are being employed increasingly in the automotive sector due to their light weight and excellent castability. This paper focuses on the strain hardening behaviour of Hipped and non-Hipped components of cast aluminium alloy 354 subjected to two-step ageing, as opposed to the routinely carried out single-step ageing. First step ageing (at 100°C) was carried out for 2 h and 5 h; ageing time at second step (at 170°C) was 1, 2 and 5 h. Mechanical properties and strain hardening behaviour were evaluated for different variants of two-step ageing treatment. Analysis of the results shows that the Hipped components have higher hardening capacity and generally higher strain hardening rate compared to the non-Hipped ones. Some of the two-step ageing treatments give mechanical properties comparable to the conventional T61 treatment, but with significantly higher strain hardening rate.

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.

Characterization and Optimized Ageing Parameters of Aluminium Alloy AA6110

2014 ◽  
Vol 931-932 ◽  
pp. 312-316 ◽  
Author(s):  
Adisorn Kodwichian ◽  
Patiphan Juijerm
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Aluminium Alloy ◽  
Ageing Time ◽  
Precipitation Sequence ◽  
Automotive Manufacturing ◽  
Treatment Processes ◽  
Transmission Electron ◽  
Heat Treated ◽  
Different Temperatures

Copper containing aluminium alloy AA6110 is introduced to automotive industries for the last few decades. An understanding of its precipitation sequence and mechanical properties during ageing treatment is valuable to optimize some heat treatment processes in the automotive manufacturing. Therefore, in this study, the precipitation sequence, microstructures and mechanical properties of copper containing aluminium alloy AA611 were investigated. A differential scanning calorimeter (DSC) with regular heating rate of 10 °C/min was performed on the solid solution heat treated aluminium alloy AA6110 for the precipitation sequence investigation. Solid solution heat treated samples were aged at different temperatures and times. Hardness values of differently aged aluminium alloy AA6110 were measured to determine optimized parameters of the ageing process. It was found that the maximum hardness value of 141 HV was detected at an ageing temperature of 160 °C for about 12 hr. Tensile properties and microstructures using transmission electron microscope (TEM) of specimens aged at a temperature of 160 °C with different ageing time will be investigated and shown.

Effect of Hot Isostatic Pressing on Fatigue Life of Cast Aluminium Alloy-354

2013 ◽  
Vol 446-447 ◽  
pp. 122-125 ◽  
Author(s):  
Aakarshit Kalra
Keyword(s):  
Mechanical Properties ◽  
Fatigue Life ◽  
Aluminium Alloy ◽  
Hot Isostatic Pressing ◽  
Aerospace Industry ◽  
Test Results ◽  
Weibull Analysis ◽  
Isostatic Pressing ◽  
Cast Aluminium ◽  
High Fatigue

Cast aluminium alloy 354 finds extensive applications in the automobile and aerospace industry due to its attractive combination of mechanical properties and excellent castability. A high fatigue strength value is desirable for these applications. The present study explores the possibility of improving the fatigue life of cast aluminium alloy by subjecting it to Hot Isostatic Pressing (commonly known as Hipping). A three parameter Weibull analysis of the fatigue test results was carried out for both Hipped and Non-Hipped samples. The Hipped samples showed an improved fatigue life compared to the Non-Hipped samples.

6000 Series Aluminium Alloy Strip Casting Using a Vertical Type Twin Roll Caster

2016 ◽  
Vol 877 ◽  
pp. 45-50
Author(s):  
He Chen ◽  
Yong Li ◽  
Jia Dong Li ◽  
Guang Jun Gao ◽  
Zhao Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Casting Speed ◽  
Strip Casting ◽  
Alloy Strip ◽  
Cast Ingot ◽  
Cast Strip ◽  
Cast Aluminium ◽  
Twin Roll Caster ◽  
Twin Roll

A vertical type twin roll caster with two side dams was used to cast aluminium alloy strip with a thickness of about 5mm at speed higher than 10m/min. The characteristics of the twin roll caster with two side dams are as follows: The diameter of the copper roll is 500mm, the width of the copper roll is 110mm and the thickness of the copper roll sleeve is 25mm.The maximum casting speed is up to 60m/min. Using the vertical type twin roll caster, a 4.5mm thickness of 6111 strip could be cast at a speed of 30m/min. The microstructure of the as-cast strip was equiaxed and spherical, not columnar. The mechanical properties of the strip casted from the vertical type twin roll caster were almost as same as that of the strip made from the conventional cast ingot.

A β-titanium alloy with extra high strain-hardening rate: Design and mechanical properties

2016 ◽  
Vol 114 ◽  
pp. 60-64 ◽  
Author(s):  
C. Brozek ◽  
F. Sun ◽  
P. Vermaut ◽  
Y. Millet ◽  
A. Lenain ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Strain Hardening ◽  
High Strain ◽  
Rate Design ◽  
Strain Hardening Rate
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