SEMINAR: Microstructure and Mechanical Properties of Multi-Layer Deposited Alloys by Laser and Ultrasonic Additive Manufacturing

Dr. Leijun Li, Professor of Materials Engineering, Department of Chemical & Materials Engineering, University of Alberta, Edmonton, Canada
When Feb 16, 2016
from 01:30 PM to 02:30 PM
Where Vogt Bldg., Room 311
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Wider application of additive manufactured metallic parts is made possible by satisfactory properties and competitive performance. Yet excellent properties result only from optimized alloy microstructure, which is interactively affected by the processing parameters during manufacturing. Therefore a fundamental challenge in additive manufacturing of quality metallic parts involves how to control the metallurgical transformations using process parameters. This talk will highlight projects that used additive manufacturing methods to produce critical metal structures for energy, natural resources, and aerospace applications. In pulsed-laser deposition of directionally solidified GTD-111 superalloy, we will show how the hot cracking defects are related with “stray grains”, and how process thermal control can be used to suppress the stray grains. In laser deposition of drilling tubes, we will discuss how to avoid ferrite formation while enhance wear resistance. In plasma-transferred arc deposition of WC-Ni/Co, we will discuss the dissolution of WC at the deposition interface, which critically lowers the toughness. In ultrasonic-consolidated aluminum-matrix multilayered composites, we will focus on the fundamentals of bond formation, and how to measure and improve the through-thickness bond strength by pressurized heat-treating.