Article
Chemistry, Inorganic & Nuclear
R. Katona, A. Rivonkar, R. Locskai, G. Bator, A. Abdelouas, J. Somlai, T. Kovacs
Summary: Safe, effective, cost-effective, easy feasible, and low-waste decontamination technologies are of fundamental importance for environmental and radiation protection. This study investigated the effectiveness of the AP-CITROX decontamination technology on Inconel alloy 690, and found that the passivation step was not completed.
APPLIED RADIATION AND ISOTOPES
(2022)
Article
Materials Science, Multidisciplinary
Huajie Tang, Jianlin Sun, Jinshan Pan
Summary: In this study, the electrochemical and localized corrosion behavior of a 316L SS/copper/316L SS composite in a 0.5 wt. % NaCl solution was investigated using electrochemical measurements and high-resolution microscopic examination. Galvanic coupling accelerated the dissolution at the internal surface and pitting attack at the external surface of the 316L layer. Polarization up to 1 V/SCE resulted in the formation of a corrosion product layer composed of metal oxides/hydroxides on top of the passive film.
Article
Engineering, Mechanical
Munish Kumar Gupta, Mehmet Erdi Korkmaz, C. Sherin Shibi, Nimel Sworna Ross, Gurminder Singh, Recep Demirsoz, Muhammad Jamil, Grzegorz M. Krolczyk
Summary: Under different working conditions, the tribological characteristics of materials exhibit a complicated and nonlinear relation. This study utilizes deep learning technologies to predict the tribological characteristics of different materials based on data obtained from ball-on-flat experiments, and analyzes the wear tracks. The findings reveal that the additively manufactured material wears with an average of 58% less intensity compared to the casted material, and the CNN Attention model demonstrates higher levels of accuracy and lower loss metrics.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Electrochemistry
Shengzan Zhang, Liyan Liu, Remy Bonzom, Xue Mi, Wei Tan, Guorui Zhu
Summary: In-situ electrochemical measurement was used to investigate the synergistic damage mechanism of fretting corrosion in Inconel 690 alloy under different dissolved oxygen concentrations. The study quantified the synergistic mechanism and found that the minimum damage occurred at a dissolved oxygen concentration of 2 ppm. The influence of the third body layer (TBL) on the fretting corrosion damage mechanism was identified as the key contributor. The formation and rupture of TBL were observed, and it was found that a TBL with excellent ductility could improve contact behavior and reduce fretting corrosion damage, while the breakdown of TBL into hard spinel oxides caused severe abrasive wear and fretting corrosion damage.
ELECTROCHIMICA ACTA
(2024)
Article
Nanoscience & Nanotechnology
T. Suresh Kumar, Manmath Kumar Dash, A. Nagesha
Summary: This investigation focused on the deformation behavior and damage development of a type 316 LN austenitic stainless steel weld joint under isothermal low cycle fatigue (IF) and thermomechanical fatigue (TMF). The cyclic stress response (CSR) of the joint was influenced by dynamic strain aging (DSA) and was observed to be higher under TMF compared to IF cycling. The difference in fatigue life under TMF and IF was explained by the development of deformation and damage through microscopy studies. The cyclic plastic deformation and damage occurred independently in the base metal and weld metal parts of the joint, competing to cause failure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Shouwen Shi, Haiyan Li, Jianpeng Cui, Xu Chen
Summary: The multiaxial low cycle fatigue behavior of nickel-based alloy 690 at 350 degrees C was studied. The presence of short-range order (SRO) and dynamic strain aging (DSA) contributes to the formation of multi-slip planar dislocation configuration under non-proportional loading paths. The effect of multiaxial loading paths on DSA was quantitatively evaluated based on average stress drop, with axial strain amplitude dominating and cross-slip strength weakening the effect.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Mihaela Iordachescu, Andres Valiente, Maricely De Abreu, Patricia Santos, Elena Scutelnicu
Summary: This paper analyzes the cause of failure in a traffic signaling overhead porticoed structure on a major highway in Spain. The failure, which occurred after over 30 years of service, is attributed to environmentally induced fatigue initiators and the galvanized condition of the bolts.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Lijin Dong, Yan Zhang, Yaolei Han, Qunjia Peng, En-Hou Han
Summary: In the weld joint of SA508-Alloy 52M, environmentally assisted cracking is more likely to occur at the grain boundaries of the dilution zone, while the fusion boundary acts as an obstacle to crack propagation.
Article
Materials Science, Multidisciplinary
Wenbin Gao, Yi Gu, Liangyu Chen, Hang Liang, Dongpo Wang, Mohsen Seifi, John J. Lewandowski
Summary: The influence of sensitization on the precipitation behavior and environmentally assisted cracking (EAC) of AA5083 alloy with the -H128 temper is investigated. The EAC susceptibility increases with increasing exposure time and elevated temperature. The relationship between nitric acid mass loss test (NAMLT) values and mechanical test results indicates that specimens with a NAMLT value greater than 25 mg/cm(2) exhibit severe EAC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Xue Mi, Pan Tang, Xiao-ming Bai, Kai-kai Shi, Jin-fang Peng, Min-hao Zhu
Summary: The formation of third body layer (TBL) significantly influences the fretting wear performance of 690 alloy tube. The presence of TBL protects the alloy tube surface, resulting in discontinuous wear scar and reduced coefficient of friction (COF) after a certain number of fretting cycles.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Seok-Hwan Ahn, Auezhan Amanov
Summary: This study investigated the effects of crosswise repetitive ultrasonic nanocrystal surface modification (CR-UNSM) treatment on the surface characteristics, tribological, and fatigue properties of Inconel 690 alloy. The results showed that all the CR-UNSM-treated specimens exhibited improved tribological and fatigue performance compared to the untreated specimens. The triple CR-UNSM-treated specimen showed the best fatigue performance, while the quintuple CR-UNSM-treated specimen had the lowest coefficient of friction and specific wear rate. The surface roughness of the alloy decreased after a single CR-UNSM treatment but increased gradually with more treatments. The surface hardness, hardened surface layer, and compressive residual stress also increased with the number of CR-UNSM treatments. Each CR-UNSM treatment was able to refine coarse grains into nano-scale grains, resulting in a thicker nanostructured surface layer and finer grain size with more treatments.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Fulin Liu, Yao Chen, Chao He, Lang Li, Chong Wang, Haizhou Li, Hong Zhang, Qingyuan Wang, Yongjie Liu
Summary: The tensile and fatigue behaviors of TC17 titanium alloy at room temperature and high temperature were studied, where it was found that the tensile strength decreases at high temperature while the elongation remains unchanged. The fatigue S-N curves and failure mode also change with temperature, with the crack initiation mainly attributed to the brittle oxygen-enriched subsurface (BOES) layer at high temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
S. Arul Xavier Stango, U. Vijayalakshmi
Summary: Bioceramic composite coatings were successfully deposited on surgical grade stainless steel substrate using electrochemical deposition method, showing good corrosion resistance and enhanced bone bonding ability.
Article
Engineering, Mechanical
Shaowu Feng, Xingyue Sun, Gang Chen, Hao Wu, Xu Chen
Summary: This study utilizes machine learning models with symbol regression to accurately predict the corrosion fatigue life of T91 steel and 316L stainless steel in advanced nuclear power plants. Symbol regression features enhance the performance of all machine learning models, with the artificial neural network model showing the most significant improvement.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Do Haeng Hur, Dong-Seok Lim, Soon-Hyeok Jeon
Summary: The study quantified the effect of zinc cessation on corrosion and release rates of Alloy 690 steam generator tubes previously oxidized in zinc-containing water. Results showed only a slight increase in corrosion rates even after cessation of zinc addition, attributed to the presence of zinc-containing chromium-rich inner oxide layer.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nuclear Science & Technology
Ali Alraisi, Yongsun Yi, Suwon Lee, Saeed A. Alameri, Maryam Qasem, Chan-Young Paik, Changheui Jang
Summary: The study investigated the effects of ATF cladding properties on plant responses to severe accidents through simulations and sensitivity analyses. The results showed that a large enthalpy of cladding could delay the increase in temperatures of fuel and cladding, resulting in delayed hot leg rupture.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Gokul Obulan Subramanian, Chaewon Kim, Woong Heo, Changheui Jang
Summary: The corrosion behavior of a high titanium heat resistant alloy in high temperature steam was evaluated, showing the formation of different oxide layers on the austenite matrix. Pre-oxidation treatment was found to improve corrosion protection in steam environment.
Article
Nanoscience & Nanotechnology
Chaewon Jeong, Byeong Seo Kong, Ji Ho Shin, Junjie Chen, Qian Xiao, Changheui Jang
Summary: The long-term thermal aging behavior of a 316L austenitic stainless steel welds was investigated using different mechanical property testing methods. The activation energies were estimated and discussed in relation to the contribution of embrittled 6-ferrite to fracture and deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Hyun Joon Eom, Ji Ho Shin, Byeong Seo Kong, Chaewon Jeong, Changheui Jang, Daehyeok Ahn, Dongchan Jang
Summary: The strengthening effect of nanosized NbC precipitates distributed in the matrix of an austenitic stainless steel was studied. Micro pillar compression tests showed that the strengthening effect was lower than expected, despite the higher number density of NbC precipitates in the alloy. Post-mortem microstructure analysis revealed extensive dissolution and re-precipitation of NbC precipitates in the deformed micro-pillars, along with the presence of stacking faults and deformation twin near the precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nuclear Science & Technology
Jin-Gyum Kim, Changheui Jang, Sung-Sik Kang
Summary: Cast austenitic stainless steels (CASSs) are commonly used in the nuclear industry, but their fracture toughness may decrease over time due to exposure to the operating environment. Despite challenges in crack detection caused by the scattering and attenuation of ultrasonic waves in CASS materials, machine learning models like KNN, SVM, and MLP have shown promising results in classifying ultrasonic signals based on aging condition.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Dong-Hyun Kim, Jong-Dae Hong, Hyochan Kim, Jaeyong Kim, Hak-Sung Kim
Summary: In this study, the mechanical properties and effects of Y2O3 particles for oxide dispersion strengthened Zircaloy-4 (ODS Zry-4) cladding were investigated using a simulation technique. It was found that the volume fraction of Y2O3 particles had a significant impact on the mechanical properties. The predicted deformation behavior of ODS Zry-4 cladding under transient conditions showed improved performance compared to Zry-4 cladding.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Ji Ho Shin, Byeong Seo Kong, Chaewon Jeong, Hyun Joon Eom, Changheui Jang, Lin Shao
Summary: This study investigates the effects of heavy ion irradiation on advanced radiation-resistant austenitic stainless steel (ARES-6P) with nanosized NbC precipitates. The results show that ARES-6P has significantly reduced void swelling compared to 316 SS, similar to ferritic martensitic steels, and a smaller increase in hardness. Although some nanosized NbC precipitates dissociate under high dose rates, a sufficient number of remaining precipitates serve as sink sites for point defects, contributing to the superior radiation resistance.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qian Xiao, Junjie Chen, Hyeon Bae Lee, Changheui Jang, Kyungnam Jang
Summary: The effect of post-manufacturing heat treatment (PMHT) on the corrosion behavior of directed energy deposition (DED) 316L stainless steel in hydrogenated water at 325 degrees C was investigated. As-DEDed and residual stress relief PMHTed (850 degrees C/2 h) specimens showed similar corrosion resistance, with thick and thin inner oxide layer on the Cr-depleted cell interior and Cr-rich cell boundary, respectively. The composition homogenization PMHTed (1150 degrees C/1 h) specimen exhibited the best corrosion resistance with a much thinner inner oxide layer. The enhanced corrosion resistance of PMHTed DED 316L compared to wrought 316L could be attributed to the unique large grain in DED 316L.
Article
Materials Science, Multidisciplinary
JongDae Hong, Daehyeok Ahn, Dongchan Jang, Hongryul Oh, JaeYong Kim, Hyochan Kim, Martin Sevecek
Summary: After the Fukushima accident, there has been a push to develop accident tolerant fuel (ATF) cladding to enhance safety under accident conditions. Many countries have focused on surface-modified Zr cladding, such as Cr or Cr-Al alloy coated Zr-alloy cladding, as a short-term solution. However, there is currently no mechanical properties data available for the thin coated layer. In this study, small scale mechanical test techniques were introduced to evaluate the mechanical properties of the thin coated layer, and the results showed that the measured properties were equivalent to the bulk properties, indicating the potential usefulness of these small-scale tests for reliable fuel performance assessment of coated ATF cladding.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sung Eun Kim, Dae Ho Kim, Jong Dae Hong, Jae -Yong Kim, Hyun-Gil Kim
Summary: In addition to oxidation resistance, improvement of corrosion resistance is important in the development of accident tolerant fuel after the Fukushima accident. Crud deposition on fuel assembly leads to problems such as power shift and accelerated corrosion, which can result in fuel failure. In this study, an uncoated Zircaloy-4 cladding and a CrAl-coated Zircaloy-4 cladding were tested in simulated PWR water. The CrAl coating effectively reduces crud adhesion and thickness, as indicated by the morphology and chemical characteristics of the crud.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Aurelia Salsabila, Aditya Pratama, Andrieanto Nurrochman, Hendra Hermawan, Anggraini Barlian, Ekavianty Prajatelistia
Summary: Magnesium has good biocompatibility but high corrosion rate. To reduce the corrosion rate, we coated the magnesium alloy with tannic acid (TA) and hyaluronic acid (HYA). The TA-HYA coating effectively reduced the corrosion rate and improved hydrophilic properties. In vitro tests showed that the coating could bind Mg2+ ions and promote new bone growth.
Article
Materials Science, Multidisciplinary
Hongsheng Chen, Jiandong Luo, Tengfei Zhang, Changheui Jang, Rui Tang, Baojun Dong, Jin Li, Xuesong Leng
Summary: The microstructures, tensile properties and corrosion behaviors of Fe20Cr25NiNb stainless steels with different Al contents in supercritical carbon di-oxide were studied. The addition of Al increased the strength but decreased the elongation of the steel. The corrosion resistance was significantly improved by the addition of Al. The steel without Al exhibited a thick chromia scale and larger magnetite nodules, while the steels with Al formed thin oxide scales consisting of mixtures of chromia and alumina.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Byeong Seo Kong, Ji Ho Shin, Chaewon Jeong, Changheui Jang, Sung-Sik Kang
Summary: The deformation behavior of 8-ferrite in an aged austenitic stainless-steel weld was studied to understand the contribution of aging-induced nanofeatures to aging embrittlement. The strengthening effect of spinodal decomposition and G-phase precipitation was evaluated and compared using nanopillar compression tests. The results showed that the nanofeatures exhibited different stability during deformation, with G-phase being less effective as an obstacle compared to spinodal decomposition.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Multidisciplinary Sciences
Bright O. Okonkwo, Chaewon Jeong, Hyeon Bae Lee, Changheui Jang, Ehsan Rahimi, Ali Davoodi
Summary: In this study, a trivalent chromium coating electrodeposited on 304L stainless steel was developed and optimized. The results showed that the grain sizes of the coatings decreased and the cracking density reduced with an increase in bath temperature. The mechanical and electrochemical tests demonstrated that the coatings deposited at a bath temperature of 80 degrees C had the best performance in terms of adhesion, wear resistance, and pitting resistance.
Article
Materials Science, Multidisciplinary
Junjie Chen, Qian Xiao, Hyeon Bae Lee, Chaewon Jeong, Kyungnam Jang, Changheui Jang
Summary: The effect of post-manufacturing heat treatment on the pitting resistance of directed energy deposition 316L stainless steel was evaluated. The results showed that the heat treatment caused changes in the microstructure of the steel, eliminating the cellular structure and retaining large columnar grains. Both heat treatments significantly improved the pitting resistance of the steel.
NPJ MATERIALS DEGRADATION
(2022)
