Heat Treatment Design for IN718 by Laser Metal Deposition with High Deposition Rates — Modeling, Simulation and Experiments

15 Pages Posted: 14 Oct 2020

See all articles by Chongliang Zhong

Chongliang Zhong

Fraunhofer ILT - Institute for Laser Technology

Venkatesh Pandian

Fraunhofer ILT - Institute for Laser Technology

Norbert Pirch

Fraunhofer ILT - Institute for Laser Technology

Andres Gasser

Fraunhofer ILT - Institute for Laser Technology

Gandham Phanikumar

Indian Institute of Technology Madras

Date Written: 2020

Abstract

Laser metal deposited processed Ni-based superalloy IN718 is characterized by elemental micro-segregation, anisotropy and Laves phases due to the rapid solidification and therefore needs homogenization heat treatment to achieve comparable properties of wrought alloys. In this paper, we report simulation based methodology to design heat treatment IN718 in a laser metal deposition process using Thermo-calc. Initially, the finite element modeling simulates the laser melt pool to compute the solidification rate (G) and temperature gradient(R). Then, the primary dendrite arm spacing are computed through Kurz-fisher [20] and Trivedi [14] modeling integrated with FEM solver.  Later a DICTRA homogenization model based on the Primary Dendrite Arm Spacing (PDAS) input values computes the homogenization heat treatment time and temperature. The simulated time scales are verified for two different experiments with contrast laser parameters and are found to be in good agreement confirmed with the results from scanning electron microscopy (SEM). Finally a methodology for integrating the process parameter with the heat treatment design is developed, and a heat treatment map for IN718 is generated that can be integrated with a FEM solver first time in Laser metal deposition process.

Keywords: DICTRA, Heat treatment, LMD, IN718, FEM, Simulation

Suggested Citation

Zhong, Chongliang and Pandian, Venkatesh and Pirch, Norbert and Gasser, Andres and Phanikumar, Gandham, Heat Treatment Design for IN718 by Laser Metal Deposition with High Deposition Rates — Modeling, Simulation and Experiments (2020). Available at SSRN: https://ssrn.com/abstract=3711240 or http://dx.doi.org/10.2139/ssrn.3711240

Chongliang Zhong (Contact Author)

Fraunhofer ILT - Institute for Laser Technology ( email )

Aachen
Germany

Venkatesh Pandian

Fraunhofer ILT - Institute for Laser Technology ( email )

Norbert Pirch

Fraunhofer ILT - Institute for Laser Technology ( email )

Andres Gasser

Fraunhofer ILT - Institute for Laser Technology ( email )

Gandham Phanikumar

Indian Institute of Technology Madras ( email )

Metallurgical and Materials Engineering
IIT Madras
Chennai, TN Tamil Nadu 600036
India
+914422574770 (Phone)
+914422574752 (Fax)

HOME PAGE: http://https://mme.iitm.ac.in/gphani/

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