a review on squeeze casting process & amplifying mechanical properties of cast aluminium matrix...

A review on Squeeze Casting Process & Mechanical Properties of cast

Aluminium Matrix Composites(AMC)

SHARATH C M

1MS16MSE14

II Semester M. Tech MSE

INTRODUCTIONSqueeze castingaluminium matrix composites (AMC)need for casting

PROCESS PARAMETERS INVOLVEDDESIGN OF EXPERIMENTS(DOE)Taguchi methodOrthogonal array

Process factors consideredMechanical & metallurgical analysis on casted productsCONCLUSION

Overview of this presentation:

Mechanical and physical properties of all alloys or composites are dominated by

several factors;AVERAGE GRAIN SIZE of a material plays a

dominant role.

Squeeze casting:

Product & die design

Die moulding & Coating

Pre-Heating Hydraulic press

(i) Capability of mass production, (ii) Easier operational parameters, (iii) Improvements in the wettability of the reinforcements by the liquid metal,

(iv) Better quality of matrix alloys due to solidification under pressure, (v) Ability to reinforce onlyselected regions of components.

Uniqueness of squeeze casting make it highly suitable for commercial application:

ALUMINIUM MATRIX COMPOSITES (AMC)

Powder metallurgy, Diffusion bonding, Spray co-deposition, 1n-situ solidification, Casting methods.

MMC’s can be fabricated through the following processing techniques

Potential candidate for weight saving in structural application,

Aluminium and with the reinforcement resulting in high specific strength, high hardness at elevated temperature, better wear resistance and good corrosion resistance.

Process parameters involved:

o Squeeze pressure in MPao Pouring temperature in degree Celsiuso Die preheat temperature in degree Celsiuso Pressure applying duration in secondso Reinforcement grain size in micro meters

DESIGN OF EXPERIMENTS(DOE)

Many papers discourse many concepts for optimizing the process parameters like Taguchi method, grey relational analysis, genetic algorithm method, statistical regression and artificial neural network models, etc.

Compared to one-factor-at-a-time experiments

To investigate the numerous factors that affect complex processes using trial and error methods. One of the most efficient tools to counter the challenge is via. an off-line quality control concept called DOE.

To find the optimal process parameter setting for each response, Effective in reduction of experiments by Fast convergence speed, To estimate the percent contribution of each individual factor,To achieve high quality product at low cost.Independence from initial values of optimization parameters

Taguchi method has been used to fulfil the following objectives:

Taguchi technique involves

L9 Orthogonal array

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

Hardness Testing:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

Fracture toughness:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

Bending strength :

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

SEM Analysis:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

SEM Analysis:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

SEM Analysis:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

SEM Analysis:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

SEM Analysis:

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

Toughening mechanisms :

MECHANICAL & METALLURGICAL ANALYSIS ON CASTED PRODUCTS

Hardness Testing:

The optimum levels of the process parameters to obtain a good surface finish of the CMC’s a squeeze pressure of 100-140 N/mm2.

Squeeze pressure was the most significant parameter of the squeeze casting process as squeeze pressure with the contribution ratio of 60.95%.

The suggested melt and die temperature during the squeeze casting of Aluminium alloys and composites are 600°C to 700°C and around 250°C respectively

CONCLUSION

The tensile strength and elongation increased rapidly as the die temperature increased from 200°C to 250°C.

The optimum reinforcement particle grain size in the range of 15–30 μm was considered for squeeze casting

The mechanical properties are enriched for both the alloys and the composites when fabricated through the squeeze casting technique, under controlled process parameters.

CONCLUSION

The following are the references taken for discursion

-REFERENCES: