Microstructural evolution of V‐Ti‐B based high‐temperature alloys during surface conditioning by means of laser beam melting

Materialwissenschaft und Werkstofftechnik, vol. 57, pp. 272–285

Abstract

Respecting the potential of additive manufacturing (AM) technologies to enhance material performance, this article presents the first results of an investigation on the use of laser beam melting (LBM) on V‐Ti‐B alloys. Latter possess a high melting point and low density which are required for high‐temperature structural applications. The research objective is to demonstrate the feasibility of the laser beam melting (LBM) technique to create graded microstructures and therefore to modify alloy properties throughout the specimen. Two values of the laser beam power were applied. The microstructural evolution of alloys with varying titanium and boron concentrations was examined by conducting scanning electron microscopy (SEM) and energy dispersive x ray spectroscopy (EDS) analyses throughout the entire process. Hardness measurements performed in the core of the samples as well as on the laser beam treated surfaces demonstrated that the surface conditioning of the V‐Ti‐B alloys result in higher hardness values, with increases ranging from 70 HV 10 (approx. 5 %; alloy V–28Ti–40B; 120 W) to 500 HV 10 (approx. 33%; alloy V–28Ti–40B; 180 W) compared to the intrinsic hardness of alloys in the arc–melted conditions. The experimental results clearly show that the fine microstructure is more favorable for the laser beam melting (LBM) application.

Authors 8

1. M. Carrion Saldaña corresponding

   University of Siegen

   Affiliation as printed

   University of Siegen, Institute for Materials Engineering Paul‐Bonatz‐Str. 9‐11 57076 Siegen Germany

2. W. Yang

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Structure and Function of Materials (IEK‐2) Wilhelm‐Johnen‐Straße 52428 Jülich Germany

3. G. Hasemann

   Otto-von-Guericke-Universität Magdeburg

   Affiliation as printed

   Otto‐von‐Guericke Universität Magdeburg Institute of Materials and Joining Technology Universitätsplatz 2 39106 Magdeburg Germany

4. H.-J. Christ

   University of Siegen

   Affiliation as printed

   University of Siegen, Institute for Materials Engineering Paul‐Bonatz‐Str. 9‐11 57076 Siegen Germany

5. R. Schwaiger Aachen

   Forschungszentrum Jülich · RWTH Aachen University

   Affiliation as printed

   Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Structure and Function of Materials (IEK‐2) Wilhelm‐Johnen‐Straße 52428 Jülich Germany

   RWTH Aachen University Chair of Energy Engineering Materials Faculty 5 Tempelgraben 55 52056 Aachen Germany

6. M. Krüger

   Otto-von-Guericke-Universität Magdeburg

   Affiliation as printed

   Otto‐von‐Guericke Universität Magdeburg Institute of Materials and Joining Technology Universitätsplatz 2 39106 Magdeburg Germany

7. B. Gorr

   Karlsruhe Institute of Technology

   Affiliation as printed

   Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (Iadditive manufacturing (AM)‐additive manufacturing (AM)P) Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany

8. Axel von Hehl

   University of Siegen

   Affiliation as printed

   University of Siegen, Institute for Materials Engineering Paul‐Bonatz‐Str. 9‐11 57076 Siegen Germany