Hardness Variation Of Heat Treated Layer-By-Layer Deposited Nickel Based Alloy

Kueh , Florence Hui Na (2012) Hardness Variation Of Heat Treated Layer-By-Layer Deposited Nickel Based Alloy. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The deposition layer-by-layer of direct metal deposition will produce the inhomogeneous material properties of the deposited material. In this study, tungsten inert gas (TIG) welding process was used to conduct the deposition process on Waspaloy. The layer-by-layer deposition of Waspaloy will form the inhomogenous of the material properties because of the dynamic distribution of heat during the deposition process. Thus, various heat treatment procedure has been applied to two types of sample; as-received Waspaloy and deposited Waspaloy. In this study, the effect of heat treatment temperature and time towards the microstructure and hardness variations on two sample of Waspaloy were investigated by using optical microscope and hardness test. By undergo the solution treatment, the as-received and deposited Wasaploy had the lowest hardness and strength compared to sample that undergo solution treatment and double ageing process. The ageing process for 16 hour and 30 hour has shows the increased hardness value of the deposited sample which undergo solution treatment at 1080°C. The increase value was from 403.2HV to 430.8HV. From the study, the results has shown that the optimun heat treatment temperature were similar to the standard heat treatment that apply for wrought Waspaloy which is solution treatmemt at 1080°C followed by stabilization at 845°C and ageing process at 760°C. The time for solution treatment were 4 hour and 25 hour, stabilization were 4 hour,8 hour and 16 hour and ageing process were 16 hour and 30 hour subjected to air cool condition. The various of time in each of the treatment still give the higher value of hardness among all samples.

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