Article
Automation & Control Systems
Alexandre Furtado Ferreira, Lucas Jardim de Moura, Bruno Silva Dantas, Fabio Jose Bento Brum, Wysllan Jefferson Lima Garcao, Roberto Carlos Sales
Summary: This study investigates the thermal parameters, tertiary dendritic arm spacings, microsegregation, etc., in the solidification process through experiments and simulations, and predicts and analyzes using the phase-field model.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Vinicius Machado Mansur, Raquel Alvim de Figueiredo Mansur, Sheila Medeiros de Carvalho, Rafael Humberto Mota de Siqueira, Milton Sergio Fernandes de Lima
Summary: Dual phase steels are widely used in the industry due to their excellent mechanical properties. Fiber laser welding was investigated on Dual Phase 600 steel sheets, showing 100% martensitic microstructure at fusion zone and increasing fractions of ferrite at Heat Affected Zone. The welded joints exhibited similar strength results and slight ductility reduction compared to non-welded specimens.
Article
Materials Science, Multidisciplinary
Cheng-Yao Huang, Hung-Wei Yen
Summary: This study investigated nano precipitates in stainless maraging steel (Custom 475) using high-resolution transmission electron microscopy. The aging process in this steel results in the formation of NiAl-B2 phase, R phase, and austenite, with different hardening effects depending on the aging temperature. Efficient hardening was achieved by aging at 520 degrees C for 4 hours, leading to the formation of both B2 and R nano precipitates and achieving maximum hardness of 601 HV.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Sigrid Benfer, Marco Thoma, Guntram Wagner, Benjamin Strass, Bernd Wolter, Wolfram Fuerbeth
Summary: Friction stir welding is a solid-state joining method suitable for different materials, and the amount and size of steel particles in the near-surface area of joints depend on the ultrasound power used.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Mechanical
M. M. Basha, M. R. Sankar
Summary: The laser powder bed fusion (LPBF) technique is used for fabricating complex features compared to traditional manufacturing processes. However, LPBF features have high surface roughness, which requires finishing processes. The electrochemical finishing process is widely used to reduce surface roughness through electrolytic ionic interactions. The significant parameters (voltage, finishing time, and temperature) were optimized using the central composite rotatable design (CCRD) to investigate surface roughness reduction. The surface roughness model was validated with a confirmation test, achieving an optimal Ra of 0.245μm from an initial Ra of 11.763μm.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ricardo N. Carvalho, Brendy C. Rincon Troconis, Greger Pioszak, Vinicio Ynciarte, John R. Scully
Summary: The relationship between microstructure, composition, and localized corrosion resistance of a low carbon CrNi-Mo martensitic-ferritic stainless steel was investigated. The study found that heat treatment significantly influenced the localized corrosion susceptibility. Austenite reversion and other structural transformations decreased the pitting potential.
Article
Materials Science, Multidisciplinary
Marie Oppelt, Claudia Heuer, Nora Brachhold, Christos G. Aneziris
Summary: A novel powder metallurgical fabrication technology for making springs based on metastable austenitic steel and partially stabilized zirconia is introduced. The developed gel casting technique allows for the variation of fabrication parameters and results in spring elements with homogenous microstructure and improved energy absorption capabilities compared to commercially available springs, making them suitable for further investigations in crash absorbing structures.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Engineering, Manufacturing
Zishan Ding, Feng Guo, Weicheng Guo, Gaoxiang Sun, Jiejun Lin, Chongjun Wu, Steven Y. Liang
Summary: This study proposed a novel microscopic grain size model and deeply investigated the dynamic evolution of material microstructure during grinding and its influencing mechanism on surface integrity. By calibrating the model coefficients through heat treatment and grinding experiments, the relationship between grain size and phase transformation was revealed, providing guidance for process optimization in grinding of maraging steel.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Nanoscience & Nanotechnology
Ali Ameri, Hongxu Wang, Zongjun Li, Zakaria Quadir, William D. A. Rickard, Manny Gonzalez, Paul J. Hazell, Juan P. Escobedo-Diaz
Summary: Microstructural changes and ferrite phase transformation under shock loading between 8.5 GPa and 17.5 GPa in a hot-rolled Lean Duplex Stainless Steel were investigated, revealing a reversible phase transformation in ferrite at a peak stress of around 17 GPa, leading to a considerable increase in yield stress.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Multidisciplinary
A. Casaroli, M. Boniardi, R. Gerosa, B. Rivolta
Summary: This study conducted fire simulations on zinc-coated steel sheets used for furniture, transformer rooms, and aeration pipes. The thermal alterations induced by fire were analyzed at 13 different temperatures and for various exposure times, revealing changes in microstructure, color, morphology, and chemical composition of surface oxides. Statistical methods were used to discuss the influence of different parameters on these alterations.
Article
Materials Science, Multidisciplinary
Sang-Woo Han, Won-Ik Cho, Lin-Jie Zhang, Suck-Joo Na
Summary: A computational fluid dynamics simulation was utilized to obtain temperature data for further metallurgical and mechanical calculations in laser keyhole welding. The simulation included solving governing equations, modeling laser beam scattering and absorption, and implementing a ray-tracing algorithm. The temperature data was then imported into a finite element method-based analysis to simulate thermal-metallurgical mechanical behavior during cooling, and model verification was done through Vickers hardness and residual stress measurements. The experimental and simulation results showed similar trends.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Jianbin Chen, Zhidong Zuo, Songze Zhou, Xiaofeng Wang, Yonglong Chen, Guoping Ling
Summary: This study utilized heat treatment process to induce the desired compressive stress near the surface of 100Cr6 steel assembled cam, and simulated diffusional and diffusionless transformations using mathematical models. The research investigated the coupled thermomechanical and metallurgical behaviors during the quenching of steel cam, and analyzed the effects of different quenchants on surface residual stress and hardness. The results indicated that a higher martensite volume fraction and slower martensitic transformation rate are advantageous for stress retention, and fast oil quenching can lead to higher compressive stress and hardness on cam surfaces compared to conventional quenching oil.
Article
Materials Science, Multidisciplinary
Ramon Jerez-Mesa, Gemma Fargas, Joan Josep Roa, Jordi Lluma, J. Antonio Travieso-Rodriguez
Summary: The ball burnishing process has a significant impact on the pre-existing microstructure, with steel containing the least amount of initial martensite being the most affected. The application of vibration assistance did not show a noticeable effect, indicating the need for alternative measurement techniques to define its impact on properties after ball burnishing.
Article
Chemistry, Multidisciplinary
R. K. Singh Raman, A. Sanjid, Parama Chakraborty Banerjee, Abhishek Kumar Arya, Rahul Parmar, Matteo Amati, Luca Gregoratti
Summary: Graphene coatings developed by CVD have been proven to significantly enhance the corrosion resistance of Ni and Cu. However, developing graphene coatings on mild steel (MS) has been a challenge. To overcome this challenge, an innovative surface modification of MS was employed to enable successful development of CVD graphene coating. This graphene coating demonstrated a two orders of magnitude improvement in corrosion resistance of mild steel.
Article
Materials Science, Multidisciplinary
Maximilian A. Wollenweber, Setareh Medghalchi, Luiz R. Guimaraes, Nicole Lohrey, Carl F. Kusche, Ulrich Kerzel, Talal Al-Samman, Sandra Korte-Kerzel
Summary: Damage behavior of DP800 steel under combinations of tensile and bending loads was characterized using machine learning, finite element modeling, and nanoindentation. The study revealed a strong connection between loading direction and damage formation in the dual-phase steel.
MATERIALS & DESIGN
(2023)
