A key challenge in the remanufacturing of structural steel components, especially those enhanced for better fatigue resistance through surface hardening, is restoring their fatigue life to its original condition. This challenge arises partly from the inadequacies of current repair technologies in reversing the effects of operational wear, fatigue, and repair-induced deterioration on surface properties. Methods like grinding remove essential hardened layers needed to meet performance criteria, while welding and other high-temperature techniques can alter the surface properties, compromising the components' integrity. As a result, the reliability of these repaired components decreases, diminishing their value and limiting reuse opportunities. Therefore, researching new repair techniques capable of recovering the nominal 'as-new' fatigue life of used or damaged steel components offers significant economic and sustainability benefits. Ultrasonic Impact Treatment (UIT) has shown considerable promise in this regard, significantly extending the fatigue life of steel components.
In this webinar, the presenter will begin by exploring the basics of UIT, with an emphasis on developing a detailed mechanistic insight into how UIT influences surface properties. The connection between modifications induced by UIT and their impact on fatigue performance will be thoroughly examined. Subsequently, the presentation will delve into the role of UIT in various critical remanufacturing scenarios through a series of key case studies. Discussions will cover UIT's effectiveness in restoring the fatigue life of samples subjected to i) pre-fatigue damage, ii) thermal damage, and iii) thermal spray treatments, highlighting how this innovative technique can enhance the durability and reliability of remanufactured components.
Guest Speakers
Joha Shamsujjoha is currently serving as an Assistant Research Professor at the Golisano Institute for Sustainability (GIS) at the Rochester Institute of Technology (RIT). His research is centered on understanding the evolution of microstructures in non-equilibrium processes like casting, welding, and additive manufacturing, aiming to quantitatively link microstructure with material properties through experiments and models. Dr. Shamsujjoha's research also focuses on reducing energy consumption and CO2 emissions in primary material production by pioneering innovative approaches in recycling and remanufacturing technologies. Before joining RIT, he was a Technical Team Leader in Additive Manufacturing at ArcelorMittal Global R&D, where he led the development of various alloys for additive manufacturing technologies. He was also responsible for coordinating global efforts related to product development. Dr. Shamsujjoha earned a B.S. in Materials and Metallurgical Engineering from Bangladesh University of Engineering and Technology, an M.S. in Materials Engineering and Science from the South Dakota School of Mines and Technology, and a Ph.D. in Materials Science and Engineering from the University of Virginia. For his contributions to the field, Dr. Shamsujjoha was awarded the 2021 Institute Medal by the American Iron and Steel Institute.