Article
Materials Science, Multidisciplinary
Jiawei Wang, Huaming Wang, Hongwei Gao, Hongwen Deng, Meiling Zhang, Xu Cheng, Shuquan Zhang, Dong Liu
Summary: This study investigates the cracking susceptibility and microstructures of nickel-based single crystal superalloy components with different substrates. The results show that samples with directional solidified substrates have lower cracking susceptibility than those with cast polycrystalline substrates. The hot cracking is attributed to a stable liquid film dependent on the misorientation angle, and liquation cracking occurs first in the substrate and can propagate along high angle grain boundaries. Based on these findings, a crack-free nickel-based superalloy with a polycrystalline substrate is successfully prepared using a continuous scanning strategy.
Article
Engineering, Mechanical
E. Pujiyulianto, K. Suyitno, K. Rajagukguk, B. Arifvianto, L. Katgerman, F. Paundra, H. T. Yudistira, F. P. Nurullah, A. Muhyi, M. F. Arif
Summary: This study aims to evaluate the effect of chemical composition on the Hot Cracking Susceptibility (HCS) using different mechanical and non-mechanical criteria. The experiments showed that Cu content decreases HCS while Mg content increases HCS.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Bo Hu, Dejiang Li, Zixin Li, Jiangkun Xu, Xueyang Wang, Xiaoqin Zeng
Summary: The hot tearing behavior of the double ternary eutectic alloy system, Al-6Mg-xSi (0 to 6.0 wt pct Si) alloys, was evaluated by a constrained rod casting mold, showing that the types and fractions of solidification phases significantly impact hot tearing susceptibility. The addition of Si content changed the freezing range and eutectic liquid fraction, affecting the nucleation, propagation, and healing of hot tear cracks. Additionally, the drop-in force value on the contraction force curve could predict the hot tearing susceptibility regarding the shrinkage coefficient.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Rudolf Korsmik, Grigoriy Zadykyan, Stepan Tyukov, Olga Klimova-Korsmik, Anastasiia Dmitrieva
Summary: This work focuses on studying the causes of hot cracks in high-temperature nickel alloys and applying an analytical method to assess the occurrence of hot cracks. Through modeling the influence of a heat source on samples and analyzing thermal fields and isotherms, an analytical method was developed to evaluate the tendency to form hot cracks in different modes and grades of alloys.
Article
Materials Science, Multidisciplinary
Y. Aboura, A. J. Garner, R. Euesden, Z. Barrett, C. Engel, N. J. H. Holroyd, P. B. Prangnell, T. L. Burnett
Summary: New-gen 7xxx series alloys have shown higher susceptibility to environmental assisted cracking (EAC) in humid air compared to AA7050 in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. The difficulty of crack initiation in AA7050 was attributed to its grain structure and intrinsic resistance of the grain boundaries to IG-EAC.
Article
Nanoscience & Nanotechnology
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: The study found that increasing strain rate after pre-exposure treatment can enhance the ductility of the ZK60 alloy. Contrary to conventional beliefs, the mechanism of PESCC is associated with a corrosion products layer containing sealed corrosive media, rather than diffusible hydrogen.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
M. Divya, H. C. Dey, C. R. Das, M. Vasudevan, Shaju K. Albert
Summary: The hot cracking behavior of nickel base superalloy, alloy 617M, was studied for its application in Advanced Ultra Supercritical (AUSC) power plants. The alloy showed high susceptibility to solidification cracking, especially in the solid solution state. However, mock-up welding experiments did not reveal significant cracking in the welds, indicating a complex behavior in actual welding applications. Microstructural characterization of the alloy showed eutectics of austenite + carbides rich in Mo and Cr in the backfilled regions of the hot cracks.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Evgeniy D. Merson, Vitaliy A. Poluyanov, Pavel N. Myagkikh, Alexander S. Bunev, Dmitri L. Merson, Alexei Vinogradov
Summary: The study investigates the effect of hydrofluoric acid treatment on the corrosion and stress corrosion cracking (SCC) susceptibility of Mg-Zn-Ca alloy. It is found that the treatment significantly reduces the corrosion rate and SCC susceptibility of the alloy. The improvement in corrosion and SCC performance is attributed to the formation of a protective surface film, removal of surface contaminations, and dissolution of secondary phase particles.
Article
Materials Science, Multidisciplinary
Chris Bilsland, Andrew Barrow, T. Ben Britton
Summary: Modern engineering alloys have custom microstructures with precipitates used for property control. Combined EDS and EBSD were used to characterize precipitate populations and analyze chemical differences between carbides found on various boundaries. Comparisons were made between different product forms to understand the distribution of these precipitates in demanding environments.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Xiaozhou Zhou, Yuheng Zhang, Yi Zhang, Huadong Fu, Jianxin Xie
Summary: This study investigates the effect of nickel content on the solidification behavior and hot-tearing susceptibility of cobalt-based superalloys. The results indicate that increasing nickel content leads to slower solidification and higher susceptibility to hot-tearing.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Crystallography
Benjamin Wahlmann, Dominik Leidel, Matthias Markl, Carolin Koerner
Summary: In this study, established hot cracking models were investigated for the development of crack-resistant nickel-base superalloys with a high gamma ' volume fraction for additive manufacturing. Four cracking models were implemented, and alloys were designed based on each cracking criterion using CALPHAD-based Scheil calculations. The cracking mechanisms were found to differ significantly depending on the process temperature, and correlation analysis showed no clear positive correlation between measured crack densities and modeled cracking susceptibilities.
Article
Chemistry, Physical
B. Hari Prasad, G. Madhusudhan Reddy, Alok Kumar Das, Konda Gokuldoss Prashanth
Summary: This study investigated the laser welding of Co-based superalloy L605, exploring the effects of laser power and welding speed on weld joint properties. It was found that the presence of hard phases in the weld zone led to an increase in microhardness, with optimal values for laser power and welding speed resulting in sound weld joint properties. Additionally, analysis revealed elongated grain growth in the weld pool and narrow grain growth in the heat-affected zone.
Article
Chemistry, Physical
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: This study aimed to clarify the healing mechanism of Mg alloys exposed to corrosion solutions and stored in air, showing that PESCC gradually reduced and was eventually suppressed with increasing time and temperature of air storage. Recovery of elongation and complete elimination of PESCC were achieved after 24 hours of air storage at 150-200 degrees C, indicating the role of corrosion solution and hydrogen in forming specific zones on the fracture surface.
Article
Materials Science, Multidisciplinary
Y. Aboura, D. F. Martelo, R. Morana, R. Akid, K. L. Moore
Summary: This study investigated the hydrogen induced cracking behavior of O&G nickel alloy 625+ (UNS N07716) using deuterium as an isotopic tracer. The results showed enrichments at dislocation slip bands, twin boundary, and grain boundary features, providing experimental evidence of the phenomenon. Analysis using scanning electron microscopy and energy dispersive X-ray techniques helped in identifying the microstructural features corresponding to deuterium enrichments.
Article
Materials Science, Multidisciplinary
Jiawei Wang, Meiling Zhang, Huaming Wang, Zhuo Li, Xu Cheng, Bo Zhang, Jia Li, Xianzhe Ran
Summary: In this study, the possibility of hot cracking in CoCrFeMnNi high-entropy alloy was successfully reduced by introducing Ti element, resulting in improved alloy microhardness, and crack-free CoCrFeNiMnTi0.6 sample was observed.
Article
Metallurgy & Metallurgical Engineering
Carolin Fink, Manuela Zinke, Sven Juettner
WELDING IN THE WORLD
(2016)
Article
Metallurgy & Metallurgical Engineering
Carolin Fink
WELDING IN THE WORLD
(2016)
Article
Materials Science, Characterization & Testing
Carolin Fink, Boian T. Alexandrov
Article
Metallurgy & Metallurgical Engineering
Carolin Fink, Manuela Zinke
WELDING IN THE WORLD
(2013)
Article
Metallurgy & Metallurgical Engineering
M. R. Orr, C. Fink, J. C. Lippold, F. Argentine
Article
Metallurgy & Metallurgical Engineering
Alexander C. Martin, Carolin Fink
WELDING IN THE WORLD
(2019)
Article
Materials Science, Multidisciplinary
Ying Lu, Dean D. Sage, Carolin Fink, Wei Zhang
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2020)
Article
Materials Science, Multidisciplinary
Alexander C. Martin, Joao Pedro Oliveira, Carolin Fink
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Metallurgy & Metallurgical Engineering
C. Fink, A. T. Hope, S. L. McCracken, J. C. Lippold
Summary: This paper describes a filler metal development project that successfully developed a Ni-30Cr filler metal with high resistance to both weld solidification and ductility-dip cracking. Computational modeling and laboratory tests were used to identify the desired composition, and extensive weldability testing showed that the new filler metal outperformed other high Cr, Ni-based filler metals commonly used in the nuclear power industry. The solidification behavior and microstructure of the new filler metal were also characterized in detail.
WELDING IN THE WORLD
(2022)
Article
Materials Science, Multidisciplinary
Jiajia Shen, Alexander C. Martin, Norbert Schell, Carolin Fink, J. P. Oliveira
Summary: This study evaluated the microstructure evolution in two arc-welded multi-principal element alloys using electron microscopy and high energy synchrotron X-ray diffraction coupled with thermodynamic calculations. By correlating microhardness maps with microstructure characterization, the strengthening phases in the welded materials were identified, aiding in fine tuning of the alloy microstructure for targeted strengths. A comparison between thermodynamically predicted microstructure and actual welded joints highlighted the difficulty of predictions in complex, scarcely studied multi-principal element systems.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Jeremy McNicol, Badri Narayanan, Narasi Sridhar, Carolin Fink
Summary: In this study, the pitting corrosion behavior of 304L austenitic stainless steel during no-backing gas (NBG) welding using waveform-controlled gas metal arc welding (GMAW) was investigated. The results showed that the NBG welds had similar pitting corrosion resistance as compared to reference welds made with backing gas, but with a slightly lower pitting potential.
WELDING IN THE WORLD
(2023)
Proceedings Paper
Engineering, Mechanical
Carolin Fink, John C. Lippold, Adam T. Hope, Steven McCracken
PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2017, VOL 6B
(2017)
