Article
Engineering, Mechanical
I. B. Akintunde, E. E. Lindsay, E. O. Olakanmi, R. V. S. Prasad, B. I. Matshediso, T. Motimedi, A. Botes, S. L. Pityana
Summary: A coal mine in Botswana is facing premature failure of conical picks, causing lower productivity and profitability. The study investigated the root causes and failure mechanisms, identifying common failures such as one-sided wear, carbide tip pull-out, slimming steel body, and carbide tip deformation. It also found failure mechanisms like tungsten carbide cracking, cavity formation, abrasion wear, and corrosive degradation. Mitigation measures recommended include using structurally stable materials with improved hardness and wear resistance, exploring manufacturing technology for improved bonding, redesigning the pick's flange, and inspecting pick rotation before each shift.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Geological
Serdar Yasar, Kingsley Odoom, Taras Shepel, Joerg Bretschneider, Carsten Drebenstedt
Summary: The experimental investigation on the effect of a spring on the rotation of conical picks was conducted for the first time. The combination of a spring and conical picks showed higher rotation, especially for a cutting depth of 5 mm. No precise conclusion was drawn regarding the effect of the skew angle on rotation. The spring experienced 4% permanent deformation as a result of 124 cutting tests.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Hadi Fathipour-Azar
Summary: This study aims to construct an optimized data-driven predictive model to establish a quantitative correlation between strength of rock, geometry of tool, and cutting action data with the mean cutting force (CF). The extreme gradient boosting (XGBoost) model is constructed by fine-tuning hyperparameters using various algorithms. The findings suggest that using a metaheuristic algorithm to fine-tune the hyperparameters of the XGBoost model can increase prediction accuracy, and sensitivity analysis provides key insights into the impact of different parameters on the mean cutting force.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Piotr Cheluszka, Stanislaw Mikula (emeritus), Jaroslaw Mikula
Summary: Rock mining is a crucial process in tunneling and underground mine construction, and the wear and tear of cutting picks significantly affect its efficiency. This article explores the causes and mechanisms of pick damage, particularly body breakage, and proposes a new design and technological solution to increase pick fatigue life.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Energy & Fuels
Ang Liu, Shimin Liu, Yiwei Liu, Bangzhi Liu, Ting Liu
Summary: The mechanical properties of coals at a nano-to-micro scale are crucial in determining their deformative and failure behaviors. This study investigated the relationship between the mechanical properties of coals and their mineralogical/carbon compositions and microstructures. The results showed that the nanoscale mechanical properties of coals are dependent on their composition and microstructure, and that sub-bituminous coals exhibit greater heterogeneity compared to bituminous coal.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Krzysztof Krauze, Kamil Mucha, Tomasz Wydro, Jan Pawlik, Aleksandra Wroblewska-Pawlik
Summary: The wearing of cutting tools is a common problem in various industries, especially in the mining sector where rocks have aggressive abrasive properties. A specific example is the conical pick, which is a fast-wearing cutting tool used in mining and rock-cutting applications. Manufacturers and users are trying different approaches to improve the lifespan of conical picks, such as heat treatment, chemical treatment, work hardening, and hardfacing. The most common method for estimating abrasive wear resistance is measuring mass loss before and after cutting under specified conditions. Alternative methods, such as volumetric loss measurements using photogrammetry, are also being explored. The study compared mass and volume loss measurements of brand-new and exploited conical picks. Slight differences in certain parameters were observed. The study also provides recommendations for the proper use of these methods, particularly in performing linear and angular measurements using 3D scans.
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Environmental
Dan Huang, Xiang Wang, Okan Su, Zhi-jie Zheng, Mingsong Gao
Summary: This study estimated the cutting force on granitic rocks through indentation tests and validated the results with theoretical models. It examined the effects of cutting parameters on cutting performance and described the relationships between rock properties and cutting parameters. The study also discussed the performance of theoretical models for predicting cutting force in granite cutting.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Materials Science, Multidisciplinary
Shiqi Fang, Nuria Salan, Christoph Pauly, Luis Llanes, Frank Muecklich
Summary: This study focused on the microstructural characterization of cemented carbides, evaluating different methods and techniques for accurate analysis. The combination of optical microscopy and line analysis was found to be suitable for direct inspection and rapid estimation of larger carbide grain sizes, while the most precise results were achieved using line analysis of backscattered electron images obtained by scanning electron microscopy.
Article
Materials Science, Ceramics
Mingyuan Ma, Yingchun Diao, Kai Wang, Xiangkui Zhou, Guojian Li, Qiang Wang
Summary: In this study, nanocrystalline gradient cemented carbide with a grain size of 155 nm was successfully prepared using V(C, N) and its sintering behavior was investigated. V(C, N) was found to promote the formation of CCFL and suppress the growth of WC grains at different sintering temperatures and holding times. The gradient cemented carbide exhibited superior hardness, fracture toughness, friction coefficient, and wear resistance at a sintering temperature of 1400 degrees C and a holding time of 60 min. Additionally, the occurrence of Co-poor phenomenon in the CCFL was related to the small radius of capillaries in the nanocrystals.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Tao Lin, Qianghua Li, Yu Han, Ke Song, Xueting Wang, Huiping Shao, Jianhui Dong, Hao Wang, Xin Deng
Summary: Cemented carbides (WC-Co-Ni) with the addition of Nb and NbC were prepared by powder metallurgy method. The microstructure and mechanical properties were analyzed. The results showed that the addition of Nb or NbC can reduce the grain size of WC. Nb has a stronger inhibitory effect on WC grain growth than NbC. The transverse fracture strength of the samples first increased and then decreased with the increase of Nb and NbC contents. The hardness of cemented carbides increased with the content of additives. The fracture toughness and impact toughness decreased with the increase of NbC and Nb contents.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wentao Jiang, Hao Lu, Jinghong Chen, Xuemei Liu, Chao Liu, Xiaoyan Song
Summary: By incorporating yttria partially stabilized zirconia into WC-Co cemented carbides, the hardness and fracture toughness can be simultaneously improved, mainly attributed to the stress-induced phase transformation of tetragonal ZrO2. ZrO2 particles dispersed homogeneously in the WC skeleton and had good interfacial bonding with both WC and Co phases, contributing to the enhancement of the mechanical properties of cemented carbides.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Rajan Kumar, Ravi Kumar Dwivedi, Ranjeet Kumar Arya, Pankaj Sonia, Anil Singh Yadav, Kuldeep K. Saxena, M. Ijaz Khan, Sana Ben Moussa
Summary: A pragmatic shift in metal development has been ongoing for industrialization in recent decades. There is a high demand for materials with high tensile strength and ductility in various engineering and industrial applications. Carbide-free bainitic in high silicon steel can meet this demand and be fabricated cost-effectively. This research thoroughly evaluates the wear rate of the proposed material in numerous applications, highlighting the influence of carbide-free bainitic and retained austenite on wear resistance in high silicon steel and the working parameters.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Luara da Costa Morais, Flavio Beneduce, Rodrigo Magnabosco, Andre Luiz Nunis da Silva
Summary: This study investigated the influence of adding TiC on the growth of carbide particles in NbC-Ni cemented carbides. The addition of TiC resulted in a decrease in NbC grain size, change in carbide morphology, and a retardation in carbide dissolution. A thin Ti rich layer was found to form at the carbide/binder interface, promoting both hardness and toughness values.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kaifeng Jing, Zhixing Guo, Tao Hua, Ji Xiong, Jun Liao, Lei Liang, Shandong Yang, Jiansong Yi, Hong Zhang
Summary: In this study, the researchers investigated the microstructural changes of the WC hard phase, phase transition of Cobalt (Co) in the binder, and grain boundary characteristics in cemented carbides containing Rhenium (Re). The addition of Re resulted in a decrease in mean grain size of WC and promoted the transition of Co phase from fcc to hcp structure. Re also weakened the concentration of preferred textures and increased the number of special grain boundaries. The increase in Re content led to higher hardness, transverse rupture strength, and wear resistance in the cemented carbides.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Saurabh Dewangan, Jaka Burja
Summary: This paper presents a failure analysis of WC-Co carbide-based twist drills used for small-scale granite drilling. The study used a bench-top drill to simulate in-situ rock-drilling operations commonly carried out in mines. After 15 minutes of drilling, the drills were examined using scanning electron microscopy. The analysis revealed signs of abrasion, decomposition, erosion, and rock deposition on the drill bits, indicating potential factors contributing to premature tool failure.
MATERIALI IN TEHNOLOGIJE
(2023)
Article
Materials Science, Characterization & Testing
Gowrishankar Wuriti, Somnath Chattopadhyaya, Tessy Thomas, Sridhar Wuriti
Summary: Acoustic emission (AE) evaluation is a significant Nondestructive Testing technique for detecting growing defects during the application of force on structures. In this study, different types of specimens of 18% Ni Maraging steel 250 grade are used to record AE parameters, which are important for assessing the structural integrity of these steel structures.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Saurabh Dewangan, Sharath Narayanan, Gurbaaz Singh Gill, Utkarsh Chadha
Summary: This work focuses on analyzing the mechanical properties and microscopic assessment of Inconel-718 plates in welded and unwelded conditions. Tungsten inert gas welding technique was used for welding. Tensile test and hardness test were performed on both types of plates to compare their properties. The results showed that the welded joint had lower strength, ductility, and hardness compared to the unwelded plate. Microstructural analysis revealed a reduction in metal carbides after welding. The ultimate tensile stress and elongation before breaking were 16% and 72% lower in the welded joint compared to the unwelded plate. Fractography analysis indicated higher ductility in the unwelded plate.
ACTA METALLURGICA SLOVACA
(2023)
Article
Metallurgy & Metallurgical Engineering
Saurabh Dewangan, Vedant Vinod Nemade, Kanad Harshal Nemade
Summary: AISI 1020 grade of steel is widely demanded in construction sectors due to its good combination of high strength and fair ductility. In this study, four pairs of AISI 1020-0.2%C steel plates were welded using shielded arc welding method. Different physical conditions were achieved through heat treating, including water quenching, oil quenching, and annealing. The samples were tested for tensile strength, hardness, and microstructure, and the results showed that annealed specimens had significantly improved tensile strength and hardness compared to as-welded specimens.
ACTA METALLURGICA SLOVACA
(2023)
Article
Metallurgy & Metallurgical Engineering
Aaluri Praveen Reddy, Saurabh Dewangan
Summary: This study compares the tensile strength, hardness, fracture behavior, and microstructural changes of welded Al-6061 plates using three different welding techniques - friction stir welding (FSW), metal inert gas welding (MIGW), and tungsten inert gas welding (TIGW). MIG welding showed a 75% and 111% higher ultimate tensile strength (UTS) compared to FSW and TIGW respectively, and had a nearly 50% higher elongation than the other two welds. The tensile properties of FSW and TIG welds without filler metal were found to be similar. Fractography results confirmed the ductile behavior of all three joints. Changes in microstructure were observed, including the transformation of the primary phase in the base metal zone (BM) into dendritic shapes in the welded zone (WZ) and the conversion of the coarse secondary phase into fine particles in WZ due to rapid cooling. The WZ was found to be harder than the heat-affected zone (HAZ) in MIG and FSW plates, while the HAZ in TIGW plates was harder than the WZ due to the accumulation of fine equiaxed secondary phase.
ACTA METALLURGICA SLOVACA
(2023)
Article
Metallurgy & Metallurgical Engineering
Saurabh Dewangan, Gopal Sukhwal
Summary: This study analyzed the effects of brine quenching on AISI 304 steel, and found that prolonged heating resulted in decreased ultimate tensile strength and elongation, increased hardness, and decreased toughness.
ACTA METALLURGICA SLOVACA
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Prajwal Bral, Jay Prakash Tripathi, Saurabh Dewangan, Anil C. Mahato
Summary: Exhaust systems are vital in today's world due to stricter air pollution regulations. The design process is complex and considers prioritized parameters, with emissions and power consumption being the main focus in exhaust manifold design. This study provides the necessary dimensions and parameter values to create a model of the exhaust system for a common compact truck used for goods loading. It then conducts a comprehensive analysis using computational fluid dynamics to compare three different working conditions of exhaust manifolds and determine the better one.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Saurabh Dewangan, Vedant Vinod Nemade, Kanad Harshal Nemade, Parth Manak Bohra, Smayan Ravikumar Kartha, Mukesh Kr Chowrasia
Summary: In this study, the mechanical behavior of low carbon steel was altered by heat treatment techniques, and the results were validated through microstructural analysis using an optical microscope. The study showed that the heat-treated samples exhibited improved ductile behavior.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Ratnesh Kumar, Aadhar Govil, Parth Daga, Shubh Goel, Saurabh Dewangan
Summary: With the projected increase in global population and food demand, improving agricultural efficiency has become crucial. A study in India, where a large percentage of the population relies on agriculture, reveals the need to enhance seed sowing practices among low-income farmers. To assist these farmers in increasing efficiency and generating additional income, a low-cost automatic seed sowing machine has been developed. This machine can plow the land, plant seeds, and adjust the spacing between consecutive seeds based on different crop requirements.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Uday Kumar, Kadir Ansari, Pawan Kumar, Pradeep Kr Mandal, Harendra Karmali, Saurabh Dewangan
Summary: This article discusses the transient thermal analysis of laser beam welding of titanium alloy thin sheets. The study shows that the effect of heat on the temperature field varies over different time frames. Additionally, the research finds that Nd-YAG laser is gaining increasing focus in laser welding due to its exceptional feature.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Aditya Nayak, Jay Prakash Tripathi, Saurabh Dewangan, Pankaj Kumar
Summary: This work describes the stress distribution and deformation of structural steel and aluminium alloy cranks used in bicycles, emphasizing the importance of selecting the best material for designing bicycle cranks.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Manish Deshmukh, Anshul Gangele, Deepak Kumar Gope, Saurabh Dewangan
Summary: This paper presents a critical review of lean manufacturing and reverse engineering for joint propeller shaft. It categorizes them based on definitions, design bases, organizations base, material bases, and tool use bases. It analyzes the concepts, wastes, strategies, obstacles, and implementation of lean manufacturing. It also discusses the concept of Industry 4.0 and its relationship with lean manufacturing.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Saurabh Dewangan, Priyansh Mahajan, Anjana Gireesh Dokala
Summary: This study conducts an analytical study on the structural and thermal aspects of friction-stir welding (FSW) of aluminium alloy (AA-6082) at various tool speeds. The methodology involves parametric modelling of the aluminium plates and the hardened steel tool, followed by structural and thermal analysis using ABAQUS CAE software. The simulation results indicate that stress and temperature increase with increasing tool speed, and the temperature on the plates gradually decreases when the tool moves away.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Saurabh Dewangan, Allen Ponsingh Jomy, G. Ashwin Nethran
Summary: This paper is an extended version of a previously published paper by the first author. It presents an analysis of stress generation and heat distribution using modeling and simulation approach in FUSION 360 software. The maximum stress generation and safe tilt angles are identified for two types of conical picks.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Saurabh Dewangan, Prakrit Singhal
Summary: Ti-6Al-4V alloy, commercially available titanium alloy, has an ideal combination of strength, toughness, and hardness. This study compares the microstructures of the as-received alloy and heat-treated alloys.
MATERIALS TODAY-PROCEEDINGS
(2022)
