Article
Mechanics
P. Fernandez-Pison, J. A. Rodriguez-Martinez, E. Garcia-Tabares, I Aviles-Santillana, S. Sgobba
Summary: This paper characterizes the microstructural evolution, plastic flow, and fracture behaviors of AISI 304L and AISI 316LN stainless steels at extremely low temperatures. It demonstrates that the martensitic transformation in AISI 304L occurs faster and to a greater extent than in AISI 316LN at both 77 K and 4 K. Additionally, experimental results reveal that AISI 316LN displays higher fracture toughness than AISI 304L.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Sk Md Hasan, Abhijit Ghosh, Debalay Chakrabarti, Shiv Brat Singh
Summary: This study investigates the relationship between deformation-induced martensite (DIM) transformation and variant selection with grain orientation in AISI 316L austenitic stainless steel during uniaxial tensile loading. The combined effect of slip and DIM transformation is comprehensively analyzed using experimental macrotexture analysis, visco-plastic self-consistent simulation, and reconstruction of prior-austenite orientations from electron backscatter diffraction data. The results show that grains with orientations like Brass, Rot-Goss, Rot-Cu undergo plastic deformation by slip and eventually undergo DIM transformation at higher strain levels. Variant selection during DIM transformation is examined using a model based on the phenomenological theory of martensite crystallography, and it is found that variants with higher interaction energies are preferred.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Matthias Droste, Sebastian Henkel, Horst Biermann, Anja Weidner
Summary: This study investigates metastable austenitic stainless steel during fatigue tests under strain control and focuses on the influence of different microstructures on fatigue life. Additionally, a proposed approach for calculating parameters based on strain-controlled tests is introduced to estimate fatigue life for materials undergoing secondary hardening due to martensitic phase transformation.
Article
Materials Science, Multidisciplinary
Hongzhuang Zhang, Mengtao Xu, Zhendong Liu, Changyou Li, Yimin Zhang
Summary: The stored energy induced by SLM process and cyclic strain during fatigue testing can trigger grain boundary migration and local recrystallization behavior, impacting the fatigue performance of stainless steel. Understanding the role of local recrystallization in fatigue failure mechanisms of additively manufactured materials is essential for further research and development in this field.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
P. C. Han, Q. Li, N. R. Tao
Summary: In this study, single-phase heterostructured samples of 316L stainless steel consisting of recrystallized grains and remaining nanostructures were obtained through dynamic plastic deformation and subsequent annealing. The tensile ductility of the heterostructured 316L SS increases with the increase of recrystallized grain volume fraction, while the strain-controlled LCF life first decreases and then increases, deviating from the monotonically increasing LCF-ductility relation. This is due to the cracking of recrystallized grains with a low volume fraction in early stages of LCF, caused by high cumulative plastic strain sustained through plastic strain partitioning.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
Hsin Shen Ho, Cheng Lv, Wenlong Zhou, Erliang Zhang
Summary: This study focuses on the investigation of low-cycle fatigue performance of gradient structured (GSed) 316 austenitic steels under high strain amplitude loading conditions. The results reveal that GSed steels have inherently lower fatigue life compared to their coarse-grained counterparts. The analyses using energy-based criterion show that the reduction in fatigue life of GSed steels is attributed to the decreased capability of damage accumulation and the lack of ability to effectively diffuse damage.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Liyang Zeng, Xiangyu Song, Nailu Chen, Yonghua Rong, Xunwei Zuo, Na Min
Summary: This study investigates the TRIP effect in austenitic steels by simulating experiments and using microstructural characterization methods. The results show that different types of martensitic transformations are associated with changes in SHR at different stages of deformation, and the contribution of DAMAI effect on SHR is greater than that of SIMT effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Christina Schroeder, Olena Volkova, Marco Wendler
Summary: This research investigates the temperature dependent mechanical properties of two types of stainless steels and finds that increasing strain rate decreases the ultimate tensile strength but has minimal effect on the uniform elongation of 4Mn. Additionally, 4Mn has a higher fraction of strain-induced alpha'-martensite compared to 1.4310.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
M. Kreins, J. Wilkes, S. Wesselmecking, U. Krupp
Summary: The Bauschinger effect in austenitic-ferritic duplex stainless steel 1.4462 was investigated, and it was found that alpha ' precipitates formed in the ferritic phase significantly enhance the Bauschinger effect, contrary to the general belief. The presence of these precipitates increases the phase difference between austenite and ferrite, leading to enhanced deformation incompatibility and local dislocation density gradients. Despite their small size and coherence, the alpha ' precipitates generate long-range back stresses that contribute to the Bauschinger effect.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Amir Baghdadchi, Vahid A. Hosseini, Leif Karlsson
Summary: This study focused on phase identification and quantification in transformation induced plasticity duplex stainless steel (TDSS) base and weld metal using light optical microscopy (LOM) and electron backscatter diffraction (EBSD) analysis, with a novel methodology introduced for multiphase materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Hongzhuang Zhang, Changyou Li, Mengtao Xu, Weibing Dai, Punit Kumar, Zhendong Liu, Zhenyuan Li, Yimin Zhang
Summary: This study conducted fatigue tests on SLMed 304L SS to understand its microstructure, fatigue failure process, and mechanism. Results showed excellent fatigue performance and defined a 'critical' value for surface roughness and porosity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Masoud Moshtaghi, Mahdieh Safyari
Summary: The study shows that in the LCF regime, the contribution of DIM transformation to work hardening improves the fatigue life of type 304SS, making it more durable than type 316SS.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Sarka Mikmekova, Jiri Man, Ondrej Ambroz, Patrik Jozefovic, Jan Cermak, Antti Jarvenpaa, Matias Jaskari, Jiri Materna, Tomas Kruml
Summary: This paper demonstrates a new technique for accurately visualizing and mapping deformation-induced α'-martensite in a metastable austenitic stainless steel. The technique utilizes energy and angular separation of signal electrons in a scanning electron microscope (SEM) to acquire micrographs with high sensitivity to structural defects. A deep learning method using the U-Net architecture extended by the ResNet encoder is proposed for precise α'-martensite mapping within a large area.
Article
Materials Science, Multidisciplinary
Lukas Travnicek, Ivo Kubena, Veronika Mazanova, Tomas Vojtek, Jaroslav Polak, Pavel Hutar, Miroslav Smid
Summary: Two approaches were tested to describe short fatigue crack growth under large-scale yielding conditions: the plastic component of the J-integral and the Polak model of crack propagation. It was found that the employed continuum mechanics models were able to give satisfactory results for stainless steels Sanicro 25 and 304L, despite their different properties. The residual fatigue lives estimated by these models were in good agreement with the experimental data, suggesting the potential of the plastic part of J-integral as a tool to model fatigue crack propagation.
Article
Nanoscience & Nanotechnology
Zhitao Wu, Kaiyu Zhang, Chengshuang Zhou, Zhengrong Zhou, Wenli Zhang, Fan Bao, Jinyang Zheng, Lin Zhang
Summary: The study found that the fatigue crack growth rate of 304 and 316 stainless steels is influenced by the deformation temperature in hydrogen and argon atmospheres, especially warm deformation can improve hydrogen embrittlement resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Arpan Das
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2018)
Article
Materials Science, Multidisciplinary
Arpan Das
MATERIALS SCIENCE AND TECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
Arpan Das, Chandra Bhanu Basak
PHILOSOPHICAL MAGAZINE
(2018)
Review
Materials Science, Multidisciplinary
Arpan Das
MATERIALS CHARACTERIZATION
(2019)
Review
Computer Science, Interdisciplinary Applications
Arpan Das
Summary: Research on fracture micro mechanisms of ductile porous solids has been conducted worldwide for the past 60 years, with a focus on various experiments, theories, thermodynamics, and computer models. The complex interactions between engineering/metallurgical variables significantly influence void volume fraction accumulation during tensile deformation in ductile materials. While the role of micro void nucleation and growth in ductile fracture is established, certain micro mechanisms governing this process remain unclear, such as micro void coalescence.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Review
Computer Science, Interdisciplinary Applications
Arpan Das
Summary: A neural network model has been established to predict the flow stress during hot deformation of various zirconium alloys. The model performs well and accurately predicts experimental data. Analysis shows that neural computation is an effective tool for modeling the complex behavior of flow stress in different zirconium alloys.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Arpan Das
Summary: This article focuses on the quantification and analysis of two-dimensional fracture features of low-carbon martensitic steel generated through temperature variation during dynamic impact experiments. The changes in microstructural states and corresponding impact responses of the steel as a function of test temperature have been quantified and compared. Image texture analysis has also been performed to understand the deformation and fracture energy of the steel during dynamic impact loading in relation to temperature.
METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Arpan Das
Summary: This article characterizes and analyzes the dimple geometry on the tensile fracture surfaces of a HfNbTaTiZr refractory high entropy alloy with different matrix microstructures. The study quantifies the changes in fracture complexions caused by different microstructural states and correlates them with the tensile responses of the alloy. This interpretation enables the quantitative use of fracture surface morphology and image texture.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Arpan Das
Summary: The fractal dimension of a novel flaky microstructure composed of crystals with hierarchical 3D nanolayered alpha/13-Zr networks in Zr-2.5Nb alloy was measured and correlated with its mechanical properties as a function of annealing temperature. Image texture analysis was performed to understand the stored-energy and thermal stability of these networks, revealing their invasive fractal character and chaos.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Arpan Das
Summary: Research reveals that the 2D-fractal dimensions of B2-phase in high-specific-strength-steel are correlated with the fractal-dimensions of dimples formed after tensile deformation and fracture. This correlation depends on the strain-rate and is independent of the initial inclusion and second-phase volumes. The average dimple-size is inversely correlated to strength and toughness properties, but positively correlated to uniform-ductility with strain-rate.
Article
Materials Science, Multidisciplinary
Arpan Das
Summary: This study quantifies and assesses the two-dimensional ductile dimple geometry of Ti-6Al-4V alloy generated through different ultrasonic vibration powers during tensile experiments. The change in microstructural states and their corresponding mechanical responses were extensively compared and interpreted. The results indicate that the ultrasonic vibration significantly affects the tensile responses and fracture appearances of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Construction & Building Technology
Arpan Das
Summary: Fracture is the separation of an object into different pieces under external stress, and the fracture surface reflects the deformation history of the material. In this study, two-dimensional ductile fracture characteristics were quantitatively measured on published creep-ruptured fractographs of a ferritic steel with different dimensions. The statistical distribution of diverse-sized dimples on the fracture surfaces was analyzed to understand the nature of disparity in creep responses of the steel. The research concludes that the creep properties/life of a ferritic steel can be reasonably deduced from the quantification of systematic crept fractographs when the material microstructure is known.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Arpan Das
Summary: The fractal dimensions of material defects growing during fatigue process have been assessed experimentally in three different Zr-Nb alloys. The relationship between these fractal dimensions and the corresponding low cycle fatigue responses has been revealed. The invasive fractal character and chaos of crack/striations' islands and tearing ridge network morphologies after fatigue-fracture have been convincingly revealed.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Metallurgy & Metallurgical Engineering
Arpan Das, Saurav Sunil, Rajeev Kapoor
METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS
(2019)
Article
Metallurgy & Metallurgical Engineering
Arpan Das
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2018)
Article
Materials Science, Multidisciplinary
Nizar Lefi, Salem Neily, Roland Bonnet
Summary: This paper investigates the elastic field in a bi-material crystal with an angular dislocation line with one branch placed in the crystal and the other along a strongly bound or welded interface. The analysis formulates the elastic field of a closed dislocation loop and solves it using the knowledge of the Green's tensor of the bi-material. The study provides a faster calculation method and has important implications for solving interfacial angular dislocation problems.
PHILOSOPHICAL MAGAZINE
(2024)
