In this study, the interfacial region of multi-material 316L stainless steel/Inconel 718 (316L SS/IN718) fabricated by laser powder bed fusion (L-PBF) is investigated in detail for first time. The consists a zone (FZ) with intermixed fused Fe and Ni, individual SS IN regions. Solid metallurgical bonding achieved, as evidenced low porosity level (~0.27%) absence cracks. Microhardness measurement...

The J-based fracture testing technique is newly extended to experimentally determine the tension-softening (a-6) relations in ceramic-matrix composites. The J-based technique originally proposed for concrete has been well established for quasi-brittle materials where the fracture process is primarily dominated by the formation of a fracture process zone and the contribution of the crack tip tou...

Listeria monocytogenes can adhere to different types of food contact surfaces within a food processing environment. Therefore, environmental sampling devices should be capable of detecting unacceptable contamination. In this study, a sponge-stick, foam spatula and an environmental swab were evaluated on their ability to detect low concentrations of L. monocytogenes on different types of food co...

A new research program has begun at UNLV in accelerator transmutation of waste. Lead Bismuth Eutectic (LBE) has been proposed for use in programs for accelerator transmutation of waste. The LBE acts both as a coolant and as a sputtering target. We have recently initiated a program to investigate the corrosion of steels by LBE. Corrosion products and chemical reactions will be identified using U...

The defining feature of high-entropy alloys (HEAs) is their unprecedented degree compositional inhomogeneity which influences dislocation movements. We demonstrate differences between a HEA (Fe 40 Mn Co 10 Cr ) and conventional solution alloy (316L stainless steel) using acoustic emission (AE) spectroscopy. AE measurements under tension show the coexistence two avalanche processes in Fe HEA, wh...

STUDY DESIGN In vitro fatigue loading using a corpectomy model outfitted with posterior pedicle screw instrumentation. OBJECTIVE The purpose of this study was to detect differences in fatigue resistance of titanium and stainless steel spinal constructs that use rods contoured using a French Bender, and to compare differences in fatigue resistance of contoured and straight titanium rods. SUM...

Experiments about single pit initiation and propagation were performed on 316L stainless steel with the aim to determine the pitting corrosion behaviour for nuclear waste containers. The experimental setup permits to control the pit development at will and to create reproducible single pits in three dimensions. Radial and deep evolutions of a disc shaped pit were studied for propagation times o...

This paper presents a multi-objective optimization of the laser milling process of micro-cavities for the manufacturing of drug eluting stents (DES). The diameter, depth and volume error are considered to be optimized in function of the process parameters including laser intensity, pulse frequency and scanning speed. A set of designed experiments is carried out in a pulsed Nd:YAG laser system u...

The interaction between the surface of stainless steel and Bacillus cereus was studied in terms of the characteristics of interfacial interaction determined from the measurement of the contact angle of the surface of B. cereus and stainless steel in the presence or absence of B. cereus adherence. The microtopographies and the roughness of the surface of stainless steel and stainless steel adher...