Investigating Laser Additive Manufacturing of Functionally Graded Ni-Cr-B-Si and SS 316L

6 Pages Posted: 12 Feb 2018

See all articles by S. M. Banait

S. M. Banait

Dr. Babasaheb Ambedkar Technological University, Lonere - Manufacturing Engineering, Students

A. N. Jinoop

Raja Ramanna Centre for Advanced Technology; Homi Bhabha National Institute - Department of Atomic Energy, Students

C.P. Paul

Raja Ramanna Centre for Advanced Technology

H. Kumar

Raja Ramanna Centre for Advanced Technology

R. S. Pawade

Dr. Babasaheb Ambedkar Technological University, Lonere

K. S. Bindra

Raja Ramanna Centre for Advanced Technology

Date Written: December 21, 2017

Abstract

Laser additive manufacturing (LAM) is a laser based solid freeform fabrication method used for “feature based design and manufacturing”. One of the interesting applications of LAM is the fabrication of functionally graded materials (FGM) for joining materials with different thermophysical properties. In the present work, a 2 kW fiber based LAM system is deployed for the fabrication of functionally graded Ni-Cr-B-Si alloy on SS 316L. Functional grading is achieved by varying the composition of NiCr-B-Si alloy and SS 316L. Trial experiments are performed to optimize the process parameters for LAM of Ni-Cr-B-Si layers on preheated substrate of SS 316L with qualification criteria of uniform regular crack free deposit. The microstructure and the mechanical properties are investigated using optical microscopy, microhardness and ball indentation testing. The optical microscopic examination revealed that a uniform regular crack free deposition could be made at optimum process parameters. The microstructural examination revealed the presence of dendritic microstructure at the top most layers. Subsequently, a gradual transition from dendritic to cellular microstructure is observed in lower layers. Vickers microhardness testing showed a gradual decline in the hardness of the sample from Ni-Cr-B-Si to SS 316L. The average hardness of 430.63 HV0.2 of 100% Ni-Cr-BSi is reduced to 185.5 HV0.2 at the substrate. Variation of hardness and energy stored by the material can be clearly observed from Ni-Cr-B-Si to other graded composition through ball indentation studies.

Keywords: Functionally Graded Materials, Laser Additive Manufacturing, Mechanical Property, Microstructure

Suggested Citation

Banait, S. M. and Jinoop, A. N. and Paul, C.P. and Kumar, H. and Pawade, R. S. and Bindra, K. S., Investigating Laser Additive Manufacturing of Functionally Graded Ni-Cr-B-Si and SS 316L (December 21, 2017). International Conference on Advances in Thermal Systems, Materials and Design Engineering (ATSMDE2017), Available at SSRN: https://ssrn.com/abstract=3101590 or http://dx.doi.org/10.2139/ssrn.3101590

S. M. Banait (Contact Author)

Dr. Babasaheb Ambedkar Technological University, Lonere - Manufacturing Engineering, Students ( email )

India

A. N. Jinoop

Raja Ramanna Centre for Advanced Technology

Indore
India

Homi Bhabha National Institute - Department of Atomic Energy, Students

Mumbai
India

C.P. Paul

Raja Ramanna Centre for Advanced Technology ( email )

Indore
India

H. Kumar

Raja Ramanna Centre for Advanced Technology

Indore
India

R. S. Pawade

Dr. Babasaheb Ambedkar Technological University, Lonere

Vidyavihar
Lonere, District Raigad, Maharashtra 402 103
India

K. S. Bindra

Raja Ramanna Centre for Advanced Technology

Indore
India

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