A computational approach to achieve uniform mechanical properties along the built-up direction in WAAM component

K, Santhan Reddy and Sharma, Abhay (2017) A computational approach to achieve uniform mechanical properties along the built-up direction in WAAM component. Masters thesis, Indian institute of technology Hyderabad.

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Wire arc additive manufacturing is a promising alternative to the conventional machining processes which builds large metallic components with low volume and medium complexity. However, its potential of higher deposition rate itself became the reason to bring large non-uniformity in mechanical properties at the bottom and top regions of the component. The reasons for this non-uniformity is the different cooling rates the portions of the component are undergone through. A finite difference model is developed to estimate the layer wise variation in thermal cycles and cooling times through which an understanding is developed on non-uniformity. To estimate the non-uniformity in mechanical properties, investigations are carried out on hardness. A hardness model is integrated with the developed thermal model to predict the layer wise hardness, estimating the non-uniformity along built-up direction. This hardness model is limited to certain range of mild steels. The experimental and simulation studies are performed on the single pass multilayer component. From experimental study, non-uniformity is observed in microstructures and the hardness values along the built-up direction. The simulated hardness values are in good agreement with the experimental one. Model is simulated under different process conditions such as maintaining constant baseplate temperature and diminishing the temperature of the heated baseplate according to the layer depositions. An understanding is developed to achieve uniform hardness along the built-up direction and a case is simulated proving it.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Thesis (Masters)
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 31 May 2019 07:12
Last Modified: 31 May 2019 07:12
URI: http://raiith.iith.ac.in/id/eprint/5410
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