Article
Metallurgy & Metallurgical Engineering
Hua-Zhen Jiang, Zheng-Yang Li, Tao Feng, Peng-Yue Wu, Qi-Sheng Chen, Yun-Long Feng, Long-Fei Chen, Jing-Yu Hou, He-Jian Xu
Summary: This study investigates the impact of laser power and energy density on the quality of parts manufactured by selective laser melting (SLM). By using normalized equivalent densityE(0)* and dimensionless laser powerq*, the study examines defects, melt pool shape, and primary dendrite spacing in SLM-produced 316L stainless steel. The findings suggest that appropriate heat input can reduce the number of large defects in the manufactured parts.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Seung Hoon Lee, Seong Gyu Chung, Hyoung Seop Kim, Jung-Wook Cho
Summary: 316L stainless steel was modified by addition of reducing agent and manufactured using laser powder bed fusion. The addition of AlN increased the nitrogen content but decreased the oxygen content. The 316L+AlN steel had larger grains, alumina inclusions, and higher yield strength compared to 316L steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Hongqiao Qu, Jing Li, Fucai Zhang, Jiaming Bai
Summary: This study investigates the effects of solidification and remelting under a chessboard 67 degrees rotation scanning strategy on the microstructure and properties of selective laser melted 316L stainless steel. The findings provide insights into the relationship between microhardness, dislocation structure, and texture, contributing to a better understanding of the characteristics of 316L stainless steel.
MATERIALS & DESIGN
(2022)
Article
Automation & Control Systems
Saad Waqar, Qidong Sun, Jiangwei Liu, Kai Guo, Jie Sun
Summary: The study focuses on the thermal behavior and melt pool morphology in multi-track multi-layer SLM of 316L steel, showing that as the number of layers increases, melt pool temperature, width, and depth increase, while heating rates and cooling rates decrease.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Qi Wu, Haoyu Chen, Weidong Chen, Wenshu Li, Yiyu Huang, Xiebin Zhu, Bin Liu, Bingfeng Wang
Summary: Optimizing the molten pool overlap by adjusting the volumetric energy density can improve the mechanical properties of SLM AISI 316L SS and expand its application prospects. Molten pool overlap plays a key role in strengthening SLM AISI 316L SS.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Thermodynamics
Z. Kazemi, M. Soleimani, H. Rokhgireh, A. Nayebi
Summary: In this study, the selective laser melting method (SLM) was simulated by finite element method (FEM) to manufacture a sample of 316 stainless steel. The temperature variation as a function of time and coordinates was obtained, along with the determination of the melting pool and the creation of keyholes at the end of each track. The obtained temperature distribution will be used to characterize the mechanical properties of the manufactured sample.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Suresh Gain, Suman Kalyan Das, Sanjib Kumar Acharyya, Dipankar Sanyal
Summary: This study investigates the performance of friction stir welding (FSW) in industrial grade steel pipes used for oil and gas transportation, and finds that FSW can produce high quality joints in both AISI316L and P91 steel pipes.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Materials Science, Multidisciplinary
Ju Ma, Xiaofeng Niu, Yan Zhou, Wenqi Li, Yan Liu, Mengqing Shen, Hongxia Wang, Weili Cheng, Zhiyong You
Summary: This study investigates the evolution behavior of the solidification microstructure during the Selective Laser Melting (SLM) process and presents a novel numerical simulation method based on the Smoothed Particle Hydrodynamics-Cellular Automaton (SPH-CA) coupling model. The simulation results demonstrate that different processing parameters influence the morphology of the molten pool and the growth characteristics of the grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Vito Errico, Sabina Luisa Campanelli, Andrea Angelastro, Michele Dassisti, Marco Mazzarisi, Cesare Bonserio
Summary: The study aimed to optimize deposition strategies for thin walls in AISI 316L stainless steel, utilizing a coaxial monitoring system and image processing algorithms to determine the best deposition strategy. The results highlighted the efficiency and stability of the region-based active contour algorithm in image processing, providing the correct building strategy for DMLD manufactured 3D components.
Article
Materials Science, Multidisciplinary
Baogang Zhou, Pingwei Xu, Wei Li, Yilong Liang, Yu Liang
Summary: Significant anisotropy in mechanical properties was observed in 316L stainless steel produced through selective laser melting, with initial deformation occurring rapidly at the boundary of the molten pool. The high-level strength was attributed to high-density dislocations and the fine cellular substructure, with lower ductility obtained when loaded in the longitudinal direction and substantial deformation occurring in the cellular substructure during loading in the transverse direction.
Article
Optics
Xinfeng Kan, Yanjun Yin, Dengcui Yang, Wei Li, Jiquan Sun
Summary: Selective Laser Melting (SLM) is an important additive manufacturing method with complex processes involving heat transport, liquid metal flow, and solidification behavior. This study successfully simulated the SLM process using the finite volume method, confirming the time for the molten pool to reach a stable state.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
David A. Griggs, Jonathan S. Gibbs, Stuart P. Baker, Ryan W. Penny, Martin C. Feldmann, A. John Hart
Summary: Metal additive manufacturing by laser powder bed fusion (L-PBF) requires investigation of complex thermophysical phenomena. This paper presents the design and validation of a high pressure laser melting (HPLM) testbed that allows for studying the effects of pressure on L-PBF outcomes.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Lenka Kuncicka, Radim Kocich, Marek Benc, Jiri Dvorak
Summary: This study focused on the development of the microstructural and mechanical properties of AISI 316L stainless steel through hot rotary swaging. The results showed that swaging introduced substructural formation, eliminated porosity, and refined grain size, leading to improved mechanical properties.
Article
Materials Science, Multidisciplinary
Jyotirmaya Kar, Krishna Guguloth
Summary: The creep properties of AISI-316L stainless steel sheets butt-joints were investigated through open-atmosphere creep rupture tests at 650 and 700 degrees C under an applied stress of 200 MPa, showing that oscillating beam joints have a higher creep-rupture life than static beam joints, attributed to their narrow weldment region with homogenous microstructure and lathy morphology of 6-ferrites.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Franco Concli, Riccardo Gerosa, Davide Panzeri, Lorenzo Fraccaroli
Summary: This work investigated the low-cycle fatigue and high-cycle fatigue behaviors of selective laser melted AISI 316L and AlSi10Mg. The results revealed that crack nucleation mainly occurs close to the surface due to poor surface quality and presence of near-surface defects. The analysis of fracture surfaces confirmed the ductile behavior of the investigated alloys with the presence of micro-dimples.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Jong Min Yu, Van Hung Dao, Kee Bong Yoon
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Thi Giang Le, Kee Bong Yoon, Young Wha Ma
Summary: The translation discusses the importance of predicting metal temperatures and evaluating microstructure changes in service-life assessments for boiler tubes in thermal power plants. The study used as-received and service-exposed tubes to analyze metal temperature and microstructure characteristics, finding significant changes in precipitation behavior and creep damage after long-term service. The results showed stable Nb(C,N) precipitates, increasing string M23C6 precipitates and Cu-rich phase particles, and the development of creep damage characterized by creep cavities linking and growing into microcracks in the tube exposed for 68,550 hours.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nuclear Science & Technology
Hong Bo Dinh, Kee Bong Yoon
NUCLEAR ENGINEERING AND DESIGN
(2020)
Article
Materials Science, Multidisciplinary
Thanh Tuan Nguyen, Tae Min Jeong, Deniz Taygun Erten, Kee Bong Yoon
Summary: The study compared the creep and tensile properties of service-exposed Super304H steel with virgin material, showing that the creep strength decreased significantly in the long-term serviced material. The degradation of properties in service-exposed material was discussed based on metallurgical analyses and precipitation mechanisms.
MATERIALS AT HIGH TEMPERATURES
(2021)
Article
Nanoscience & Nanotechnology
Van Hung Dao, Jong Min Yu, Kee Bong Yoon
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Engineering, Multidisciplinary
Thanh Tuan Nguyen, Kee Bong Yoon
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2020)
Article
Engineering, Multidisciplinary
Jung Soo Song, Vanno Lok, Kee Bong Yoon, Young Wha Ma, Byeong Ook Kong
Summary: This study introduces a quantitative Risk-Based Inspection (RBI) methodology for high-energy piping systems in power plants, involving risk assessment, probability-of-failure assessment, and consequence-of-failure assessment. The research also discusses specific inspection locations, equipment modification factors, and the evaluation of generic mean time to failure (MTTF) based on the Larson-Miller parameter (LMP) equation.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Engineering, Mechanical
Gimo Yang, Young Wha Ma, Thi Giang Le, Kee Bong Yoon
Summary: A study was conducted to predict the creep deformation behavior of a MERT type KHR45A steel, proposing a modified theta projection model that incorporates statistical analysis techniques. The model showed higher accuracy and practical significance compared to existing models, confirmed through mean absolute percentage error (MAPE) and symmetric MAPE (SMAPE) calculations.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Van Hung Dao, Hyung Ki Ryu, Kee Bong Yoon
Summary: Investigation on water leaks from an ASTM A312-TP316L stainless steel pipe revealed that localized corrosion and microbiologically influenced corrosion were the primary causes of perforation failure near circumferential welds, where the leaks occurred. Analysis using optical microscope, SEM, and EDS confirmed the presence of sulfur-reducing bacteria creating biofilms, accelerating the corrosion process at the heat-affected zone.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Hyo Jung Bang, Thi Giang Le, Joo Yong Kim, Hyung Ki Ryu, Kee Bong Yoon
Summary: Life assessment predictions were made for reformer tubes made of HP40Nb grade steel in the petrochemical industry, with correlations established between the area fractions of precipitated carbides and service periods. The study found that an increase in precipitate area fractions was directly proportional to service times, and this relationship could be utilized for on-site residual life assessments using the surface replication method.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Jae Hyeon Bae, Jong Min Yu, Van Hung Dao, Vanno Lok, Kee Bong Yoon
Summary: The study found that both SLM processing parameters and the building direction of the material can affect the creep properties of SS316L. Vertical specimens exhibited better creep resistance and life compared to horizontal specimens.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Kee Bong Yoon, Thi Giang Le, Jung Soo Song, Nwe Ni Tun, Thanh Tuan Nguyen, Vanno Lok
Summary: Failure analysis of a hydrogen fluoride pressure regulator revealed corrosion pits and networklike corrosion structures on the surface of the Hastelloy diaphragm, leading to fatigue crack growth and gas leakage. Mo, Ni, and Cr in Hastelloy contributed to the formation of a passivation film, while M6C carbide may have acted as a crevice corrosion cell.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Thanh Tuan Nguyen, Kee Bong Yoon, Jaeyeong Park, Un Bong Baek
Summary: The low-cycle fatigue behavior of P91 steel was investigated under various strain amplitudes at different temperatures. It was found that the fatigue life decreased with increasing temperature and strain amplitude, leading to degradation of fatigue limits and increased cyclic softening. Models were established to express the relationship between strain amplitude-fatigue life curves and cyclic stress-strain. The transition fatigue life also increased at elevated temperatures due to multiple oxidation-enhanced crack initiations after long-term exposure.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Thanh Tuan Nguyen, Kee Bong Yoon, Toan Thang Vu, Jaeyeong Park, Un Bong Baek
Summary: A significant reduction in the fatigue life of cross-weld P91 specimens was observed at elevated temperatures. The fatigue strength reduction was directly linked to the shift of fatigue cracking locations and the deterioration mechanisms in the intercritical heat-affected zone.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Vanno Lok, Thi Giang Le, Kee Bong Yoon
Summary: In this study, the creep deformation and rupture behavior of welded joints from service-exposed P91 steel were investigated. The experimentally measured creep strain data were used to model the creep deformation behavior and predict the creep rupture life of the cross-weld specimen. Factors such as stress estimation and creep damage tolerance were discussed for life prediction of cross-weld joints.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
