Article
Chemistry, Multidisciplinary
Nagumothu Kishore Babu, Mahesh Kumar Talari, Prakash Srirangam, Abdullah Yahia AlFaify, Ateekh Ur Rehman
Summary: This study investigated the influence of welding speed on the microstructure, hardness, and tensile properties of AZ31 magnesium alloy gas tungsten arc welds. The results showed that increasing welding speed led to a wider equiaxed zone in the center of the fusion zone, and the highest welding speed resulted in the smallest average grain size. Welds prepared with higher welding speed exhibited increased strength, hardness, and ductility, which can be attributed to low heat input.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Young-Ran Yoo, Jae-Sung Kim, Young-Sik Kim
Summary: This study focused on the influence of welding and laser peening on the microstructural changes in 304L stainless steel and proposed a model for microstructural change by laser peening on welded 304L stainless steel.
Article
Materials Science, Multidisciplinary
A. Ramarajan, K. Jayakumar
Summary: Aluminium alloys are widely used in manufacturing lightweight materials with high strength. Welding of dissimilar aluminium alloys is essential for industrial applications to achieve complex shapes. Pulsed tungsten inert gas (PTIG) welding was used in this study to minimize welding defects, and the optimal PTIG welding parameters for AA5083 and AA6082 alloys were identified to ensure high ultimate tensile strength (UTS).
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Musa Kilic, Anil Imak, Ihsan Kirik
Summary: The study found that enhanced microhardness could be achieved with SiC reinforcement in TIG coatings of AISI 304 steel, showing a dendritic structure with dissolved SiC particles. Coatings with SiC and NiBSi/SiC exhibited excellent hardness and wear resistance.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Li Zhang, Shengli Li, Chunlin Zhang, Xingang Ai, Zhiwen Xie
Summary: A WC-particle-reinforced nickel-based alloy surfacing layer was fabricated on 42CrMo ultra-high-strength steel. The microstructure and mechanical properties of the surfacing layers were investigated at different impact temperatures. Results showed that the WC particles changed in morphology with increasing temperature and the surfacing layer exhibited lower impact energy and fracture toughness at higher temperatures.
Article
Materials Science, Multidisciplinary
Min Chen, Xuefeng Zhang, Xuan Xiao, Guowei Li
Summary: The mechanical properties of Ti, V, W, Mo-based cermets were improved by adding different amounts of WC and Mo, but when the WC and Mo content was increased, it led to a decrease in toughness as the in-situ precipitated white particles agglomerated, making it difficult for the binder to release stress via deformation.
Article
Engineering, Manufacturing
Anup Kumar Maurya, Chandan Pandey, Rahul Chhibber
Summary: This study investigates the influence of heat input on microstructure evolution and mechanical properties of nitronic steel and super duplex stainless steel dissimilar welded joints. The results show that heat input has a significant impact on the hardness and mechanical properties of the welded joints.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Engineering, Multidisciplinary
Muhammad Samiuddin, Jing-Long Li, Muhammad Taimoor, Mohammad Nouman Siddiqui, Sumair Uddin Siddiqui, Jiang-Tao Xiong
Summary: The study investigated the effect of adjusting welding heat input on multi-pass TIG welding of aluminum alloy Al-5083, revealing that medium heat input (1-2 kJ/mm) can offer the best mechanical properties by reducing welding defects and improving joint quality.
DEFENCE TECHNOLOGY
(2021)
Article
Nuclear Science & Technology
C. Pandey, J. G. Thakare, P. K. Taraphdar, P. Kumar, A. Gupta, S. Sirohi
Summary: The dissimilar weld joint of 2.25Cr-1Mo steel and lean duplex LDX2101 steel was prepared using Gas Tungsten Arc Welding (GTAW) process, and the microstructural stability and mechanical behavior of the weld were studied after post-weld heat treatment (PWHT). The PWHT caused the formation of a soft zone at the interface of the weld metal and heat-affected zone in the 2.25Cr-1Mo side, and resulted in changes in hardness and impact toughness measurements.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Tao Xu, Yonghua Shi, Zexin Jiang, Leilei Wu, Ying Ma, Zishun Wang
Summary: The cryogenic toughness of 9 wt% nickel steel joints can be improved by using K-TIG welding technology and adding appropriate amounts of nickel and molybdenum. The microstructure of the weld metal consists of body-centered cubic martensite with refined grain size, resulting in enhanced cryogenic impact toughness. After K-TIG welding, the tensile strength of the weld metal is higher than that of the base metal, and the addition of nickel leads to higher cryogenic impact absorbed energy. Furthermore, the weld metal without filler exhibits brittle fracture, while the weld metal with nickel exhibits ductile fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Sanjeev Kumar, Chandan Pandey, Amit Goyal
Summary: The study investigated the impact of using dissimilar filler metal and post-weld heat treatment on the mechanical properties of P91 steel welded joints, revealing that PWHT significantly improved the tensile strength of the welded joints.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Metallurgy & Metallurgical Engineering
Massab Junaid, Fahd Nawaz Khan, Tauheed Shahbaz, Haris Saleem, Julfikar Haider
Summary: The study examined the influence of titanium alloy and commercially pure titanium as fillers on dissimilar pulsed tungsten inert gas weldments in terms of microstructure, mechanical/nano-mechanical properties, and residual stresses. The addition of filler alloy improved the tensile properties and nano-mechanical response of the weld joint, while an asymmetrical residual stress profile close to the weld centerline was attributed to the low thermal conductivity of Ti-5Al-2.5Sn.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Fengxiang Zhang, Lijing Zheng, Fangfang Wang, Hu Zhang
Summary: The microstructural and mechanical properties of Ni55Ti45 alloy and Hf-modified Ni55Ti45-xHfx alloys were studied. Hf addition suppressed certain phases and promoted the formation of HfO2 particles. The alloy with 3% Hf content exhibited the best combination of fracture toughness and tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Ming Ji, Lujun Huang, Qi An, Yang Bao, Xiping Cui, Yang Jiao, Lin Geng
Summary: In this study, TiBw/Ti6Al4V composites were subjected to TIG remelting to refine the network microstructure, resulting in an increase in hardness and tensile strength. The main strengthening mechanisms were attributed to microstructure refinement and the formation of alpha' martensite phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Saisai Liu, Hao Tu, Changjun Wu, Jianhua Wang, Xuping Su
Summary: The addition of Si alloy and Si-Ti complex alloying can increase the hardness of ZA12 alloy, but may decrease its impact toughness. Complex alloying using Si and Ti can simultaneously improve the hardness and impact toughness of the alloy, enhancing the comprehensive mechanical properties.
MATERIALS TODAY COMMUNICATIONS
(2021)
Review
Engineering, Manufacturing
Nitin Dixit, Varun Sharma, Pradeep Kumar
Summary: The review discusses the importance of abrasive flow machining in aerospace, automotive, and biomedical industries, as well as the systematic research methodology and various aspects of investigation into AFM.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Manufacturing
Nitin Dixit, Varun Sharma, Pradeep Kumar
Summary: A low-cost hydrogel-based abrasive media has been developed for AFM, using Xanthan Gum as the main constituent, with added crosslinking and thickening agents. The developed abrasive media exhibited shear-thinning behavior and thermal stability in the operational temperature range of AFM, with confirmed crosslinking and elasticity properties through FTIR analysis.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Multidisciplinary
Nitin Saini, Rajneesh Raghav, V Bist, Rahul S. Mulik, Manas Mohan Mahapatra
Summary: P91 and P92 steel grades are commonly used in ultra-supercritical power plants, with notch toughness and microstructural stability being essential for high temperature creep properties in welded joints. The presence of d-ferrite patches in P92 filler welded joints can negatively impact the Charpy impact toughness and microhardness of the weld fusion zone.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Engineering, Manufacturing
Anuj Vats, Akshay Dvivedi, Pradeep Kumar
Summary: **Shaped-Tube Electrolytic Drilling (STED) is a process based on electrochemical dissolution that can fabricate high aspect-ratio (AR) holes rapidly on superalloys. By using different electrolyte solutions and adjusting process parameters, such as voltage and feed rate, the non-uniformity and error of micro-holes can be effectively reduced to improve dimensional accuracy.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Engineering, Manufacturing
Umashankar Tripathi, Nitin Saini, Rahul S. Mulik, Manas Mohan Mahapatra
Summary: In this study, a gas tungsten arc welding-based wire-arc additive manufacturing setup was developed, and a low-carbon alloy steel was used to fabricate a geometry. The mechanical properties and microstructure of the printed alloy were analyzed, revealing good tensile properties and fracture toughness, but significant scatter in hardness tests concerning the building direction.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Nitin Saini, Yajing Wang, Leijun Li
Summary: This study conducted a failure analysis on the external piping of a once-through steam generator, and found that the degradation near the welds was primarily caused by erosion-corrosion. Through metallographic analysis, chemical analysis, and computational fluid dynamics simulation, the researchers determined that the welds at the 6 o'clock and 12 o'clock positions experienced the most severe erosion-corrosion due to the maximum velocity of the condensed water.
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2022)
Article
Materials Science, Multidisciplinary
Yajing Wang, Leijun Li, Zhe Lyu, Nitin Saini, Zhisheng Wu
Summary: This investigation used various methods such as metallography, chemical analysis, crystallography, and electrochemistry to identify the damage mechanism of a circumferential girth weld in a high-pressure steam distribution pipeline. It was found that the root pass girth weld was severely damaged by flow-accelerated corrosion. Computational fluid dynamics simulation and laser confocal microscopy confirmed that higher fluid velocities resulted in the removal of a protective magnetite layer and the formation of deeper craters. These craters originated at the pre-existing weld toe on the downstream side of the girth weld. In the early stage of erosion-corrosion, material removal caused by water erosion was concentrated at the fluid-facing root weld surface. The weld heat-affected zone was identified as the weakest link for galvanic corrosion due to its high-angle grain boundaries and significant carbide precipitation, leading to depletion of Cr and Mo along the grain boundaries.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
M. Karimzadeh, M. Malekan, H. Mirzadeh, L. Li, N. Saini
Summary: The effects of minor Ti addition on the microstructure and mechanical properties of the CoCrFeNi high entropy alloy were studied. The results showed that Ti segregation resulted in the precipitation of the R-phase and serrated grain boundaries during solidification. The addition of Ti improved the shear properties of the alloy due to simultaneous grain refinement and the formation of tortuous grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Suvan Dev Choudhury, Nitin Saini, Zhe Lyu, K. Ravikiran, Zachary Tervonen, Leijun Li
Summary: Tests were conducted to investigate the effects of existing defects on strain hardening and strain aging of boiler tubes. The local plastic strain near the pre-existing defects was quantified using electron backscatter diffraction (EBSD) and finite element analysis (FEA). It was found that the strain hardening and strain aging effects depend on the degree of plastic deformation. It is recommended to maintain the hydrostatic pressure near 110% of the maximum allowable operating pressure (MAWP) in order to prevent significant alteration of mechanical properties at stress concentration points in boiler membranes containing defects.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Engineering, Manufacturing
Nitin Dixit, Varun Sharma, Pradeep Kumar
Summary: In this study, an advanced variant of abrasive flow machining (AFM) called ultrasonic-assisted magnetic abrasive flow machining (UAMAFM) was developed. The effects of external assistances, machine, and media-based parameters on material removal and surface roughness improvement were analyzed. Optimized process parameters were determined to achieve maximum material removal and surface roughness improvement. Predictive models based on statistical analysis were also developed.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Nitin Saini, Rahul. S. S. Mulik, Manas Mohan Mahapatra, Leijun Li
Summary: This study investigates the effect of preheating temperatures on the retention of delta-ferrite in Grade P92 steel welds. A relation between preheating temperature and thickness of welded plate using Rosenthal 2-D heat equation was developed. The volume fraction of delta-ferrite was predicted using the DICTRA diffusion model for different preheating temperatures.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Waris Nawaz Khan, Rahul Chhibber, Nitin Saini, Ravikiran Kopparthi, Zachary Tervonen, Navneet Khanna, Vishvesh Badheka, Leijun Li
Summary: Novel CaO-CaF2-TiO2-SiO2-coated electrodes using mining waste red ochre have been developed to replace commercial ferro-alloy powder, aiming to promote environmental sustainability. These electrodes demonstrated improved weld microstructure, microhardness, and wear resistance when used to weld dissimilar metals. The addition of SiO2 in the coating composition enhanced hardness and wear resistance, while the reduction of Fe2O3 lowered alloying element concentration in the weld.
JOURNAL OF SUSTAINABLE METALLURGY
(2023)
Article
Materials Science, Multidisciplinary
Kopparthi Ravikiran, Leijun Li, Greg Lehnhoff, Nitin Kumar Sharma, Rangasayee Kannan, Nitin Saini, Suvan Dev Choudhury, Zhe Lyu
Summary: The microstructure and crystallographic texture of HF-ERW X65 Grade pipeline steel are studied in relation to its impact toughness. After HF-ERW, the X65 base metal forms a weld joint with four distinct regions, including the TMAZ, FGHAZ, CGHAZ, and Weld Zone. Different texture components are observed in these regions due to the thermomechanical-controlled processing and recrystallization. The CGHAZ, where a high density of cleavage planes is found, is frequently associated with fracture in impact toughness testing.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Proceedings Paper
Metallurgy & Metallurgical Engineering
Ramver Singh, Akshay Dvivedi, Pradeep Kumar
Summary: A study on environmentally-friendly surface coating method based on near-dry electric discharge machining (ND-EDM) for depositing TiN layer onto Ni-Ti substrate was conducted. The effects of process parameters on surface integrity of deposited layers were evaluated, and the deposited surfaces were characterized using XRD, FE-SEM, and AFM techniques. The results demonstrated successful deposition of TiN layer onto Ni-Ti substrate.
TMS 2021 150TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS
(2021)
Article
Management
Neha Choudhary, Anish Kumar, Varun Sharma, Pradeep Kumar
Summary: The study identifies and analyzes 12 major barriers for the successful adoption of additive manufacturing (AM) in medical supply chains (SC), using an integrated interpretive structural modelling-analytical network process (ISM-ANP) methodology. Results show that the lack of material variety, lack of education and training for designers and workers, and limitations in production technology are the most critical barriers. Managers should focus on addressing technological and organizational barriers to develop successful AM-based SCs.
JOURNAL OF ADVANCES IN MANAGEMENT RESEARCH
(2021)
