Article
Materials Science, Multidisciplinary
Pushpendra Kumar Dwivedi, R. Vinjamuri, S. K. Sahoo, Krishna Dutta
Summary: This study investigates ratcheting deformation and bulk texture evolution in HSLA steel. The results show that the variation in mean stress is more detrimental to strain accumulation, while the effect of stress amplitude is more pronounced in reducing ratcheting life. The fracture surface morphology indicates the formation of typical striations in the crack propagation region along with overload failure. Bulk texture studies reveal a transition between 'Υ' fiber and 'ζ' fiber, with an increase in texture intensity as ratcheting strain accumulates.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Chang Hong, Tao Chen, Zhenhua Li, Aobo Du, Meng Liu, Pan Liu, Yonghao Lu
Summary: This study investigates the ratcheting deformation behavior of 316LN stainless steel under different mean stresses. Experimental results and molecular dynamics simulation reveal the three-stage evolution of ratcheting deformation and its dependence on dislocation evolution. The findings provide insights into the microstructure evolution mechanism of ratcheting deformation at atomic scale.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Weiwen Kong, Yongqiang Wang, Yipeng Chen, Xin Liu, Chao Yuan
Summary: The study found that the fatigue life of GH742 superalloy is significantly affected by mean stress and stress amplitude. Tensile ratcheting strain increases with the number of cycles, and multiple fatigue cracks initiate from surface inclusions, crystallographic facets, and slip bands.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Prerna Mishra, R. S. Rajpurohit, N. C. Santhi Srinivas, G. V. S. Sastry, Vakil Singh
Summary: This study investigates the fatigue behavior and fracture characteristics of steel under asymmetric cyclic loading, finding that plastic strain increases with mean stress and stress amplitude, leading to reduced cyclic life. However, an increase in stress rate reduces accumulated plastic strain and increases cyclic life. Microstructural changes were observed with an increase in the three parameters, showing a transition from lath martensitic structure to subgrain structure, along with dislocation cells and forest dislocations. Scanning electron microscopy revealed unique features of fractured specimens, with progressive reduction in diameter towards the fracture-end, fatigue striations on the tapered circumferential surface and dimples on the fracture surface.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nuclear Science & Technology
A. Ramachandra Murthy, S. Vishnuvardhan, K. Anjusha, P. Gandhi, P. K. Singh
Summary: The primary objective of this study is to predict the crack initiation life of pipes with notches in order to make decisions regarding the operational life of nuclear power plants. Through benchmarking different analytical models and comparing them with experimental results, it was found that the predicted crack initiation life is in very good agreement with the actual results.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Ziling Peng, Gilbert Henaff, Jean-Christophe Le Roux, Romain Verlet
Summary: Uniaxial strain-controlled fatigue tests were performed on 304L austenitic stainless-steel specimens at 300°C in air and in a pressurized water reactor (PWR) with or without the application of a mean stress. The tests were conducted at different total strain amplitudes. Results showed that for strain amplitudes greater than or equal to 0.2%, the presence of PWR water had a detrimental effect on fatigue life, characterized by increased crack initiation and propagation. Additionally, the application of a mean stress reduced the fatigue life for a fixed strain amplitude in a given environment. Specifically, the PWR water effect on fatigue life was re-activated for strain amplitudes below 0.2% in the presence of a mean stress due to accelerated crack initiation caused by enhanced plastic strain accumulation. The reduction in fatigue life under mean stress application was primarily influenced by the maximum stress level and strain amplitude, rather than the generated ratcheting strain.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Caiming Liu, Xu Chen, Weiqiu Chen, Liting Shi, Xuming Su, Oluwadamilola Ogunmola, Liyuan Shan
Summary: The ratcheting fatigue behavior of Z2CN18.10 austenitic stainless steel elbow under internal pressure and cyclic loading was investigated. The evolution of axial and hoop ratcheting strains at different positions on the outer surface of the elbow was discussed. It was found that the hoop ratcheting strain was always greater than the axial ratcheting strain, and the critical point for evaluating ratcheting fatigue life was the crown (90°) of the elbow. A modified Manson-Coffin equation was proposed to accurately predict the fatigue life of the elbow.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Mechanical
Deepali Mathur, Sanjeev Saxena, V. M. Nistane
Summary: A numerical methodology is demonstrated to predict the experimentally determined results of healthy and cracked piping elbows subjected to fatigue loading. The study includes five different types of elbows made of 304LN SS, including healthy elbows and elbows with cracks at different locations. Numerical techniques are used to determine crack initiation life and crack propagation life, which are then compared with experimental results. The finite element models of healthy and cracked elbows are validated with experimental results of elbow ovalization. It is found that the variation of tri-axiality quotient (q) of the un-cracked ligament nearly matches in all cases except when the crack is at the extrados and subjected to closing load (ECE-6).
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Metallurgy & Metallurgical Engineering
Saikat Ranjan Maity, Sunil Kumar, Lokeswar Patnaik
Summary: Experiments were conducted to investigate the strain-controlled low cyclic fatigue behavior and cyclic behavior of ratcheting in annealed austenitic stainless steel. The study examined the effects of different strain conditions and mean stress on the steel's behavior, as well as the impact of cyclic loading on low cyclic fatigue. The results provide important insights into the fatigue resistance and failure mechanisms of the steel.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Engineering, Multidisciplinary
R. S. Rajpurohit, P. S. M. Jena, Shivam Kumar, J. K. Sahu
Summary: Ratcheting fatigue tests revealed that increasing mean stress and stress amplitude reduced fatigue life, while increasing stress rate enhanced fatigue life. Experimental results showed varying plastic strain ranges under different test variables.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Materials Science, Multidisciplinary
Emil Evin, Miroslav Tomas
Summary: The effect of laser welding on the mechanical properties and formability of austenitic stainless steel and ferritic steel was studied. The results showed that laser welding had a negative impact on the formability of the ferritic steel, while it had no significant effect on the formability of the austenitic stainless steel.
Article
Materials Science, Multidisciplinary
Jinheung Park, Matruprasad Rout, Kyung-Mun Min, Shuai-Feng Chen, Myoung-Gyu Lee
Summary: A microstructure-based multiscale framework was developed to study the relationship between microstructure evolution and mechanical behavior of AISI 304LN stainless steel. The model effectively combines crystal plasticity finite element method and probabilistic cellular automata approach to accurately simulate heterogeneous deformation and dynamic recrystallization. The model was validated by comparing it with experimental data, demonstrating its ability to predict flow stresses, grain sizes, DRX volume fraction, and deformed texture. The developed model also allows for examination of recrystallized grains and pole figures during the DRX process, as well as characterization of mechanical responses at the grain level.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Liu CaiMing, Oluwadamilola Ogunmola, Li BingBing, Zheng Yiming, Chen Xu
Summary: This study investigated the influence of thermal aging on the ratcheting boundary of 316LN austenitic stainless steel, finding that the boundary slightly increases with thermal aging time, especially with a larger secondary ratio. RCC-MR standard was found to be more conservative compared to ASME, and it is suggested to choose the stage when the efficiency index V stabilizes for a more conservative and reasonable approach.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Yang Song, Zhe Zhang, Hantuo Ma, Masashi Nakatani, Mie Ota Kawabata, Kei Ameyama
Summary: This study investigates the effects of grain structure and stress-loading conditions on ratcheting behavior and fatigue life of harmonic-structured SUS316L stainless steels fabricated by mechanical milling and hot isostatic pressing. Results show that grain size and applied mean stress significantly influence ratcheting-strain accumulation and fatigue life.
Article
Chemistry, Multidisciplinary
Abdulnaser M. Alshoaibi, Abdullateef H. Bashiri
Summary: The aim of this study is to investigate fatigue crack growth behavior in the mixed mode (I/II) of AISI 316 austenitic stainless steel alloy at different mode mixity angles of 30 degrees, 45 degrees, and 60 degrees. This alloy is extensively used in the marine industry and various structural components due to its exceptional properties. By analyzing crack growth behavior, the study aims to provide insights into the material's durability and potential for long-term use in demanding applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Nanoscience & Nanotechnology
Krishna Dutta, Rajat Kishor, Lopamudra Sahu, A. K. Mondal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Metallurgy & Metallurgical Engineering
Srimant Kumar Mishra, Anitarani Brahma, Krishna Dutta
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2016)
Article
Nanoscience & Nanotechnology
R. Kreethi, A. K. Mondal, Krishna Dutta
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Nanoscience & Nanotechnology
S. Sreenivasan, Srimant Kumar Mishra, Krishna Dutta
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Materials Science, Multidisciplinary
Srimant Kumar Mishra, H. Roy, A. K. Mondal, Krishna Dutta
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2017)
Article
Materials Science, Multidisciplinary
R. Kreethi, Srimant Kumar Mishra, A. K. Mondal, Krishna Dutta
PHILOSOPHICAL MAGAZINE
(2018)
Article
Materials Science, Multidisciplinary
Krishna Dutta, Srimant Kumar Mishra, Pushpendra Kumar Dwivedi, Chinnam Sivateja
Summary: This study systematically investigates the density and role of characteristic dislocations in controlling ratcheting and ratcheting-creep behavior of A356 Al alloy for the first time. The results show that the accumulation of strains during ratcheting is related to both mean stress and stress amplitude, with screw dislocations playing a significant role in controlling ratcheting behavior. In contrast, edge dislocations dominate in ratcheted+crept specimens, which is associated with work softening and an inverse relationship between edge dislocation quantity and strain accumulation.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Multidisciplinary
Srimant Kumar Mishra, Anitarani Brahma, Krishna Dutta
Summary: This study developed a model using artificial neural network to predict the mechanical properties of Al-Si-Mg alloy, based on input parameters such as alloy chemical compositions, modifier used, fabrication techniques and heat treatment parameters. The effects of processing parameters on mechanical properties were predicted and explained based on metallurgical perspective.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Prabina Kumar Patnaik, Priyadarshi Tapas Ranjan Swain, Srimant Kumar Mishra, Abhilash Purohit, Sandhyarani Biswas
MATERIALS TODAY-PROCEEDINGS
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Prabina Kumar Patnaik, Srimant Kumar Mishra, Priyadarshi Tapas Ranjan Swain
MATERIALS TODAY-PROCEEDINGS
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Prabina Kumar Patnaik, Priyadarshi Tapas Ranjan Swain, Srimant Kumar Mishra, Abhilash Purohit, Sandhyarani Biswas
MATERIALS TODAY-PROCEEDINGS
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Srimant Kumar Mishra, Himadri Roy, Krishan Dutta
MATERIALS TODAY-PROCEEDINGS
(2018)
