Advances in Surface Engineering V: Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Surface Engineering Committee
Program Organizers: Bharat Jasthi, South Dakota School of Mines & Technology; Arif Mubarok, PPG Industries; Tushar Borkar, Cleveland State University; Rajeev Gupta, North Carolina State University
Tuesday 5:30 PM
March 21, 2023
Room: Exhibit Hall G
Location: SDCC
N-7: Effect of Ultrasonic Impact Peening on Austenitic Stainless Steel Welds for Nuclear Canister Applications: Merbin John1; Alessandro Ralls1; Manoranjan Misra1; Pradeep Menezes1; 1University of Nevada
Austenitic stainless steel (ASS) based structural components are ideal for storing spent nuclear fuels in dry storage canisters. However, inferior weld properties cause premature failure which is a potential safety concern. This study investigates the effect of ultrasonic impact peening (UIP) on gas tungsten arc welded (GTAW) ASS for nuclear canister applications. More specifically, UIP is carried out on the as-weld SS304 for 1.5 mins and 3.5 mins impact time and its effect on mechanical properties and microstructural features was studied. UIP induced a maximum residual compressive stress (RCS) of -458 MPa and 584 MPa on the top surface of the weld for 1.5 and 3.5 mins, respectively. Electron back scattered diffraction (EBSD) studies showed superior grain refinement in the fusion zone. UIP also enhanced microhardness in the fusion zone. Electrochemical corrosion studies showed excellent corrosion resistance of UIP’ed weld compared to as-weld.
N-32: Evaluation of LME Susceptibility of Al-Zn-Si Coated TRIP Steel: Daehoon Jeong1; Seok-Hyun Hong1; Suk-Kyu Lee2; Sung-Joon Kim1; 1GIFT, POSTECH; 2POSCO Technical Research Laboratories
Although Zn-coated advanced high strength steels (AHSS) are widely used in the automotive industry, Zn-assisted liquid metal embrittlement (LME) is one of the critical problems to overcome. In this respect, the development of Al-Zn-Si ternary coating system is drawing attention to replace Zn coating. In this study, Al-Zn-Si coated TRIP steel has been selected, and the susceptibility to LME is assessed with hot tensile tests using the Gleeble 3500 which can closely simulate the resistance spot welding (RSW) process. The microstructural changes of the coating layer during the hot tensile testing is analyzed with the scanning electron microscopy (SEM) and its effect on LME is discussed. In addition, a possible mechanism of base metal exposure, liquid metal penetration, and fracture in the coated steel is explained as well.
N-8: Microstructural Changes of Electron Beam Treated AISI 316L with the Combination of Computation of Thermal and Mechanical Fields: Crtomir Donik1; Irena Paulin1; Federica Rimoldi2; Matjaž Godec1; Massimiliano Bestetti2; 1Institute Of Metals And Technology; 2Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria “Giulio Natta”
We investigated effects of low energy, high current electron beam (LEHCEB) irradiation on the surface modification of AISI 316L, with both experimental and modelling. AISI 316L was treated with LEHCEB in different operational settings, varying the accelerating voltage of electron beam and number of pulses. A layer of α’-martensite was detected on surface of samples via X-ray diffraction technique and EBSD. Prepared cross-sections corroborated martensitic transformation to be deformation-induced due to the peculiar thermal stress induced in material by electron beam irradiation. With these results, we could show mean of LEHCEB treatments as an alternative route to provide surface quenching.Intense non-equilibrium thermal and mechanical fields are known to develop during electron beam EB treatments were modelled in COMSOL. Simulation data were related to experimental results to propose a preliminary modelling process for the transformation and evolution of martensite in steel due to strains generated by irradiation.
N-9: Novel Fretting-Corrosion Mechanisms of Friction Stir Processed Steel Manufactured by High Deposition Rate Additive Manufacturing Process: Alessandro Ralls1; Pradeep Menezes1; 1University of Nevada, Reno
Acting as a novel technology, the application of high pressure deposited (HPD) coatings has attracted to attention of many due to its solid-state deposition-like features. From an industrial perspective, the application of HPD coatings is fundamental to preserving the working lifespans of various machining components. This is especially true in chloride-rich environments that are continuously exposed to oscillatory contacting tangential movements. However, due to the porous nature of HPD coatings, they suffer from rapid material degradation due to severe pitting and premature brittle fracture. In this work, we investigated the influence of FSP on the fretting-corrosion mechanisms of HPD steel. It was found that the effect of FSP enhanced the metallurgical bonding and intrinsic hardness of the HPD coating. As such, their fretting-corrosion performance was also improved, concluding that FSP is a viable method to enhance the surface quality of HPD coatings.
N-36: Production of Gold Nano Films by Pulse Electrodeposition: Ugur Barut1; Metehan Erdogan1; 1Ankara Yildirim Beyazit University
Production of gold nano films on indium tin oxide (ITO) coated glasses were studied at different current densities by pulse current electrodeposition method. Produced nano films were characterized by scanning electron microscope, thin film X-ray diffraction, atomic force microscope, focused-ion beam, X-ray photoelectron spectroscopy and surface resistance and optical transmittance measurements. The results revealed that gold coatings of 5-12 nm were successfully produced as continuous films on ITO surfaces at all current densities covered in this study. It was found that the current efficiency decreased especially at high current densities and thickness, microstructure and texture of the coatings were strongly dependent on the current density.
N-10: Use of Novel Degradable Surface Coatings for Enhanced Biofilm Growth: Cody Allen1; Whytneigh Duffie1; Timothy Brenza1; Travis Walker1; Venkataramana Gadhamshetty1; 1South Dakota School of Mines and Technology
Biofilm formation is beneficial in a diverse range of chemical and environmental engineering applications, such as wastewater treatment, bioelectrosynthesis, and bioelectrochemical technologies, such as microbial fuel cells. The latter technologies depend on the direct utilization of electrons by microbes on an electrode surface to produce electricity or chemicals. Commonly, applying surface coatings to technologically relevant materials is done to increase material-microbe interactions. Unfortunately, many of these surface coatings are expensive and difficult to scale for industrial applications. Here, we present the use of an inexpensive surface-eroding, methacrylic-anhydride-based oligomer coating to improve initial cell attachment and uniform biofilm formation. The surface-eroding oligomers chemically degrade in the presence of water, leaving the matured biofilm on the relevant material surface. This work aims to explore the changes in biofilm formation as a function of the erosion rate of the methacrylic-anhydride coating using copper foils that are blade-coated with different formulation chemistries and thicknesses.