The research focuses on the modification of the microstructure in high-pressure diesel engines through improvements in the austempering process. Unstable conditions during the austempering treatment led to the formation of undesirable microstructural features, including non-uniform subsurface decarburization, excessive carbide precipitation, and regions of pearlitic phases due to...
This study investigates the limitations of quenching media in resisting crack propagation in low-carbon steel, particularly in relation to microstructural features and surface diffusion effects. A novel quenching medium was developed by incorporating carbon nanotube (CNT) into oil-based due to their excellent cooling properties. Specimens of low-carbon steel were prepared and...
The 2015 Ranau earthquake sequence, consisting of a Mw 6.0 mainshock followed by more than 80 aftershocks, provides a critical dataset for understanding ground-motion behavior in a shallow active fault system. This study analyses waveform characteristics from the closest seismic station using segmented time-series analysis (20–80%) to evaluate temporal variations in shaking...
As part of a substrate characterization, plant-specific zinc–magnesium (ZM) alloyed steel substrates were investigated. The substrates differ in their manufacturing specifications, which influences the formation and composition of the ZM layers in the near-surface region. The structural and chemical characterization of the sample surfaces were performed using confocal Raman...
Large excavators are critical assets in large-scale mining operations, relying on gearboxes to transmit mechanical energy during lifting and digging activities. Gear tooth failures in these systems lead to high maintenance costs and unplanned downtime, constituting a significant operational challenge. Understanding the root causes of such failures is essential for improving...
This study aims for a comprehensive data analysis of failure assessment by integrating the qualitative and quantitative methods. Failure assessment of metal laminate panel is crucial and particularly vulnerable to delamination, core crushing, and buckling under extreme loading conditions, such as cyclic loading. Traditional assessment methods are time-consuming and costly. Hence...
This paper presents a comprehensive failure analysis performed on a shell nozzle of an ammonia rectifier tower heat exchanger belonging to the sour water treatment unit of an oil refinery, which failed in operation. The study investigates the main causes of the failure using ultrasonic thickness measurement techniques, visual inspection, chemical composition, microstructure...
Austenitic stainless steel AISI 304L small bore pipes are widely used in nuclear facilities for transferring radioactive fluids. However, Lack of fusion (LF) weld defect during Gas Tungsten Arc Welding (GTAW) of on-plot small bore pipe welds remain a challenge due to site constraints, predominantly in 2G and 5G welding positions at higher elevation. A hybrid welding approach...
One of the foremost challenges in the field of SiC MOSFET and diode failure analysis is the effect of thermally modified mold compound on the decapsulation process. The extended total etch time that thermal modification imposes on the process of wet chemical decapsulation has created a niche for new techniques to fill. This paper focuses on use cases for the JIACO microwave...
Image segmentation is a valuable tool for visual image data inspection of semiconductor device structures. For the large amounts of data provided by recent advancements in automated scanning electron microscope (SEM) and focused ion beam-scanning electron microscope (FIB-SEM) data acquisition, automatic segmentation becomes indispensable to fully exploit the information contained...
The head cover of a 100-MW hydroelectric power machine was broken by fatigue after 35 years of operation. Stress measurements on a unit identical to the failed unit together with the power generation history were used to obtain a stress history and perform a fatigue life prediction. The stress measurement shows that the shaft and the operating ring transfer loads to the head...
In-depth investigation of corrugated plate heat exchanger plate made of 316 stainless steel was carried out with reference to equipment design, service conditions and materials of construction in this paper. The failure mechanism and cause were studied based on metallographic testing, micromorphological analysis and fluid simulation. Macroscopic inspection showed that the...
In the rapidly evolving domain of space technology, the reliability of satellite components stands as a paramount concern, especially with the advent of CubeSats and other small satellites. Precise engineering analysis, such as finite element analysis (FEA), has become indispensable for predicting failure modes, enhancing component reliability, and ensuring mission success...
The development of erosion-resistant coatings requires the knowledge of their complex failure mechanisms. Here, the damage due to erosion on smooth and rough surfaces is investigated and compared experimentally and numerically. In a low-speed collision, the smooth surface damage is always symmetrical. Still, the rough surface damage is different depending on the shape of the...
Failure mode and effects analysis (FMEA) has long been a cornerstone of risk management and reliability engineering, providing a systematic method for identifying potential failure points, evaluating risks, and implementing mitigation measures. In the current manufacturing landscape—shaped by rapid technological advancement, complex supply chains, and heightened expectations for...
Though sodium is the most preferred coolant for fast breeder reactors due to excellent heat transfer capabilities, its high chemical reactivity poses a concern during accidental leaks. Despite defense in depth in various levels for protecting the sodium leaks in the heat transport circuits, small undetected leaks may lead to localized degradation of structural material due to...