Roshan Sebastian

9 Questions 18 Answers 0 Followers

Questions related from Roshan Sebastian

In COMSOL simulation of SLM- AM process, how do we add the powders in cubic packing over the build substrate?

Am trying to simulate the SLM process for a single layer of Alloy 718. I need to add 718 powders of 40 microns thick over the substrate plate and simulate the printing. How could one add up the...

29 October 2019 2,820 10 View

In SLM process, what are the reasons for part to protrude out from the surface and how to avoid it?

During the SLM printing process, it was observed that the recoater blade constantly touch the parts and as a result less amount of powders were seen to deposit over the printed part. Why would...

29 May 2019 1,904 3 View

Reference books to learn in depth about Creep in alloys and its various testing methods?

Could you please suggest me a book for understanding more about Creep properties of metal. In addition, I want to know the various testing methods available.

16 January 2019 5,995 7 View

Is it true that the residual stress in EBM process are smaller compared to SLM process due to long time exposure to high temperatures in the former?

I want to know the exact reasons for residual stress formation and the standard adopted practices to avoid them during 3D printing.

20 December 2018 7,661 9 View

What does micro-pores present on the microstructure of additive manufactured alloys signify?

In the analysis of the etched microstructure of the additive manufactured nickel superalloy, micro pores in the nano-meter dimensions were found in the matrix and also on the dendrite structures....

30 May 2018 2,508 6 View

Is differential etching for SLM processes associated with the thermal stress or any high-energy associated during the process?

The sample showed processed by SLM shows differential etching with respect to surface and the bulk. The cross-sectional samples after the deposition are etched. What could be the reasons for the same?

21 February 2018 4,509 4 View

How is the heat extracted as the melt pool Solidifies in the Laser Beam Melting Process ?

Consider an hemispherical molten pool, which has a higher temperature at the top surface and a lower temperature at the bottom surface. I am confused about the direction of heat extraction and the...

28 January 2018 1,358 3 View

XRD data for a sample, which is a mix of two dissimilar alloys and its Interface. How to analyse the data and separate out the constituent phases?

The data for a bulk sample is obtained in Powder mode. How could one separate out the constituents using JCPDS search?

22 September 2017 8,609 3 View

What is the appropriate etchant for micro-structure analysis of the Interface between Inconel 625 and Cast iron

In order to examine the micro-structure in cross-section of the Inconel alloy on Cast iron, I'm not able to find a suitable etchant which could give good image. There are various etchants for both...

23 May 2017 8,991 12 View