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LPBF Processability of NiTiHf Alloys: Systematic Modeling and Single-Track Studies.

Hediyeh Dabbaghi¹, Mohammad Pourshams¹, Mohammadreza Nematollahi¹

¹Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.

Materials (Basel, Switzerland)

|August 29, 2024

Summary

This summary is machine-generated.

This study explores the laser powder bed fusion (LPBF) of NiTiHf high-temperature shape memory alloys (HTSMAs), identifying a processability window free of solidification cracking. Findings enhance understanding for extreme environment applications.

Keywords:

computational modeling high-temperature shape memory alloys (HTSMAs)laser powder bed fusion (LPBF)laser remelting experiments processability assessment solidification cracking

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Area of Science:

Materials Science
Additive Manufacturing
Metallurgy

Background:

NiTiHf high-temperature shape memory alloys (HTSMAs) offer potential for extreme environments.
Limited research exists on their processability using laser powder bed fusion (LPBF).
Solidification cracking is a primary challenge in LPBF of these alloys.

Purpose of the Study:

To investigate the printability of NiTiHf alloys with varying Hf content (1, 2, 15, 20 at. %) using LPBF.
To identify and mitigate solidification cracking during the LPBF process.
To establish a processability window for NiTiHf HTSMAs.

Main Methods:

Computational modeling using Thermo-Calc/2022a to calculate solidification cracking susceptibility (Kou's index, Scheil-Gulliver model).
Experimental validation using a powder-free laser remelting method on NiTiHf ingots.
Analysis of alloy composition effects on printability.

Main Results:

Determined solidification cracking susceptibility for different NiTiHf compositions.
Developed a powder-free laser remelting technique for process validation.
Established a processability window with no cracking likelihood under various LPBF conditions (laser power, scan speed).

Conclusions:

The study provides critical insights into the processability of NiTiHf HTSMAs via LPBF.
Identified key factors influencing solidification cracking.
The established processability window facilitates the use of these alloys in advanced engineering applications.