Influence of Process Parameters on Blistering During T6 Heat Treatment of Semi-Solid Castings

2014 ◽  
pp. 27-33 ◽  
Author(s):  
Youfeng He ◽  
Xiaojing Xu ◽  
Fan Zhang ◽  
Daquan Li ◽  
Stephen Midson ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Process Parameters ◽  
Influence Of Process Parameters ◽  
T6 Heat Treatment ◽  
Semi Solid

scholarly journals Microstructural Features and Wear Characteristics of Semi-Solid Processed A356 Aluminum Alloy

2018 ◽  
Vol 5 ◽  
Author(s):  
K. Raju ◽  
N. Gopi Krishna ◽  
L. Sankara Rao ◽  
S. N.Ojha
Keyword(s):  
Heat Treatment ◽  
Cold Water ◽  
Isothermal Holding ◽  
Hot Forging ◽  
Cold Forging ◽  
Al Alloy ◽  
T6 Heat Treatment ◽  
Solid Region ◽  
A356 Aluminum ◽  
Semi Solid

In the present study the microstructural features and tribological characteristics of hot forged A356 Al alloy subjected to SIMA (Strain induced melt activation) and T6 heat treatment (semi-solid) processes have been investigated. The SIMA process consists of hot forging of alloy at 325˚C followed by cold forging at room temperature, isothermal holding at 580˚C for 10 min and quenching. In case of T6 heat treatment, the hot forged alloy was solution treated at 540˚C for 4 hours followed by quenching in cold water and artificial aging at 155˚C for 3 hours. The microstructure of the alloy exhibited a spherical or globular morphology of the primary α-phase with uniform distribution of solutes in the interdendritic region. A detailed analysis of the solidification behaviour of the melt from semi-solid region of the alloy is reported. The reasons for the consequential changes in tribological properties of A356 Al alloy processed by SIMA andT6 heat treatment have been clearly brought out.

Effects of Natural Ageing on T6 Heat Treated Rheocasts of 319S Aluminum Alloy

2016 ◽  
Vol 256 ◽  
pp. 58-62 ◽  
Author(s):  
Kang Du ◽  
Qiang Zhu ◽  
Da Quan Li
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminium Alloys ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Artificial Ageing ◽  
Natural Ageing ◽  
T6 Heat Treatment ◽  
Semi Solid

T6 heat treatment is an effective method to improve the comprehensive properties of Al-Si-Cu-Mg series aluminium alloys. Solution treatment temperature and time, quench process and media, as well as artificial ageing temperature and time are the key factors to determine mechanical properties. Besides these factors, natural ageing, i.e. the holding time between quenching and the starting of artificial treatment at ambient temperature was observed to be significant affect mechanical properties of the aluminium alloys. This effect on semi solid processed aluminium alloys was lack of investigations as the semi solid process produces T6 treatable and weldable components. The present paper focuses on the change regularity of hardness and precipitate behaviour of semi-solid 319S aluminium alloy under different natural ageing (NA) treatment additional to standard T6. Density and morphology of hardening precipitates are analysed using TEM, and the influence mechanism of NA during T6 heat treatment will be discussed. The results show that NA has a positive influence on mechanical properties of the rheo-cast 319S alloy.

scholarly journals Effect of Short T6 Heat Treatment on the Thermal Conductivity and Mechanical Properties of Different Casting Processes Al-Si-Mg-Cu Alloys

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1450
Author(s):  
Zhong-Qiang Dong ◽  
Jin-Guo Wang ◽  
Zhi-Ping Guan ◽  
Pin-Kui Ma ◽  
Po Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Heat Treatment ◽  
Eutectic Silicon ◽  
Cast State ◽  
Relevant Research ◽  
T6 Heat Treatment ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Semi Solid

The thermal conductivity of alloys is gradually becoming appreciated. It is often assumed that heat treatment can improve the thermal conductivity of Al-Si-Mg-Cu alloys, but there has been little relevant research. This paper studies the effects of different casting processes and short T6 heat treatment (ST6) on the thermal conductivity and mechanical properties of Al-Si-Mg-Cu alloys. The results show that a microstructure with fine α-Al crystal grains can be obtained by semi-solid die casting (SSDC), improving the mechanical properties of the Al-Si-Mg-Cu alloy in the as-cast state. After SSDC, the size and aspect ratio of eutectic silicon can be reduced by ST6 treatment, effectively improving the thermal conductivity and mechanical properties of the alloy. Finally, the influence of eutectic silicon on electron transport is analyzed in detail. With the SSDC + ST6 processing technology, Al-Si-Mg-Cu alloys with excellent thermal conductivity and mechanical properties can be obtained.

Effect of Heat Treatment on Microstructure and Mechanical Properties of Semi-Solid Formed Magnesium Alloy AZ91D

2010 ◽  
Vol 148-149 ◽  
pp. 346-352
Author(s):  
Dong Nan Li ◽  
Wen Zhe Chen ◽  
Jun Tian
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Die Casting ◽  
Primary Phase ◽  
T6 Heat Treatment ◽  
Microstructure And Mechanical Properties ◽  
Alloy Az91d ◽  
Semi Solid

The semi-solid slurry of AZ91D magnesium alloy was prepared by twin-screw stirring mixer, the microstructure and mechanical properties of semi-solid formed magnesium alloy AZ91D produced by rheo-diecasting and conventional liquid die casting were investigated, respectively. The strengthen mechanism of the semi-solid formed magnesium alloy after heat treatment was analysed by EDS. The results show that the mechanical properties of semi-solid formed magnesium alloy can be enhanced markedly by T4 and T6 heat treatment, owing to decrease of the porosity and less segregation in casting, brittle eutectic compounds dissolves gradually into α-Mg matrix, and the primary phase α-Mg decomposes in the course of heat treatment. In as-cast state, the tensile strength, elongation and hardness of semi-solid formed magnesium alloy AZ91D are 222MPa, 2.3% and 74 HBS, respectively. In T4 heat treatment state, the tensile strength and elongation are increased by 13% and 210%, and in T6 heat treatment state, the tensile strength and hardness are increased by 11% and 16%. The mechanical properties of castings formed by conventional liquid die casting are deteriorated distinctly after T6 heat treatment due to its porosity and crack defects.

The Influence of Heat Treatments for Laser Welded Semi Solid Metal Cast A356 Alloy on the Fracture Mode of Tensile Specimens

2008 ◽  
Vol 141-143 ◽  
pp. 169-174 ◽  
Author(s):  
G. Kunene ◽  
Gonasagren Govender ◽  
L. Ivanchev ◽  
R.D. Knutsen ◽  
H.P. Burger
Keyword(s):  
Heat Treatment ◽  
Base Metal ◽  
Fracture Mode ◽  
Heat Affected Zone ◽  
A356 Alloy ◽  
Solid Metal ◽  
T6 Heat Treatment ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Semi Solid

The CSIR rheo-process was used to prepare the aluminium A356 SSM slurries and thereafter plates (4x80x100 mm3) were cast using a 50 Ton Edgewick HPDC machine. Plates in the as cast, T4 and T6 heat treatment conditions which had passed radiography were then butt laser welded. It was found that the pre-weld as cast, T4 and post-weld T4 heat treated specimens fractured in the base metal. However, the pre-weld T6 heat treated specimens were found to have fractured in the heat affected zone (HAZ).

Determination of Die Design Rules for Semi-Solid Die Casting Process and Its Experimental Investigation

2005 ◽  
Vol 475-479 ◽  
pp. 2533-2538 ◽  
Author(s):  
Chung Gil Kang ◽  
P.K. Seo ◽  
Byung Min Kim
Keyword(s):  
Heat Treatment ◽  
Die Casting ◽  
Casting Process ◽  
Die Design ◽  
Design Rule ◽  
Gating System ◽  
T6 Heat Treatment ◽  
Semi Solid ◽  
Line Design ◽  
Air Vent

Die design rule for semi-solid die casting (SSDC) with A356 electromagnetic stirring (EMS) aluminum alloy, was proposed. The die design rule included inspection of machine, part requirements, parting line determination, sleeve, plunger, gating system, overflow, air vent, ejector pin, and heating line design. The specification of gating system, overflow, air vent, plunger tip, and sleeve suitable for respective part were regulated. Two steps die system of lower-positioned gate and three steps die system of center-positioned gate were manufactured for 4 automobile suspension parts, based on the die design rule. For the sound filling pattern and solidification behavior, injection speeds of 4 parts were summarized to the interval (from V1 to V4). As a result of observing the microstructure of 4 parts after T6 heat treatment, primary Al-α phase was globularized and fine Si particles were distributed around the grain boundary. The mechanical properties of 4 parts with T6 heat treatment were investigated and showed ultimate tensile strength (UTS) of 330 MPa, yield strength (YS) of 250 MPa, and elongation of 7.5% as average.

The influence of process parameters and heat treatment on the properties of cold sprayed silver coatings

2011 ◽  
Vol 205 (20) ◽  
pp. 4798-4807 ◽  
Author(s):  
Naveen Manhar Chavan ◽  
M. Ramakrishna ◽  
P. Sudharshan Phani ◽  
D. Srinivasa Rao ◽  
G. Sundararajan
Keyword(s):  
Heat Treatment ◽  
Process Parameters ◽  
Influence Of Process Parameters
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