Article
Engineering, Mechanical
Menghao Liu, Zhuoyan Ni, Cuiwei Du, Zhiyong Liu, Meihui Sun, Endian Fan, Qiuyu Wang, Xiaojia Yang, Xiaogang Li
Summary: The investigation revealed that the failure of a heavily cracked geothermal water convection tube was caused by stress corrosion cracking induced by chloride in the service environment and sensitization of the matrix. Additionally, residual stress arising from the manufacturing process also promoted the failure process.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Liming Mou, Tiantian Bian, Shaohua Zhang, Baosheng Liu, Pengpeng Wu, Jinling Zhang, Yanchong Yu, Yuezhong Zhang, Xinchao Wang
Summary: The IGC mechanisms and resistance mechanisms of 304 and 304L stainless steels were investigated by adjusting carbon contents. It was found that the maximum IGC degree of 304 stainless steel occurred at an aging temperature of 660 degrees C for 10 hours, which was due to the continuous precipitation of Cr-carbides along grain boundaries. In contrast, the 304L stainless steel with adjusted carbon content exhibited superior IGC resistance after long-term aging treatment, attributed to restrictions on the precipitation of Cr-carbides and continuous supply of Cr atoms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Ping Deng, En-Hou Han, Qunjia Peng, Chen Sun
Summary: The corrosion behavior and mechanism of irradiated 304 nuclear grade stainless steel in simulated pressurized water reactor primary water were investigated. It was found that the corrosion rates of the steel increased with irradiation dose, accompanied by the evolution of oxide formation. The correlation between oxide evolution, corrosion kinetics, and mechanism was discussed.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Electrochemistry
Guanqun Ma, Wen Xian, Hongyun Bi, Moucheng Li
Summary: The sensitization characteristics of 310S stainless steel were investigated after aging at 500 to 900 degrees C for less than 60 min, showing varying degrees of sensitization depending on the aging temperature and time.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Minsung Hong, Ho Lun Chan, Yujun Xie, Elena Romanovskaia, John R. Scully, Peter Hosemann
Summary: The study investigated the effect of Te concentration in molten FLiNaK salt on the corrosion and mechanical properties of 304 stainless steel. The corrosion depth of samples decreased with increasing Te concentration after 48 h immersion at 600 degrees Celsius. Additionally, the 1.0 wt% Te sample showed less reduction in mechanical properties compared to the 0.1 wt% Te sample. It is hypothesized that a protective Cr-oxide layer is formed beneath the Ni-Fe rich layer formed by selective leaching of Cr.
Article
Nanoscience & Nanotechnology
Sunil Kumar Bonagani, Kamlesh Chandra, K. V. Ravikanth, Harish Donthula, Supratik Roychowdhury, Vivekanand Kain
Summary: This study investigated the formation and growth of sigma phase in stainless steel and its effects on mechanical and corrosion properties. The results showed that the growth of sigma phase led to a reduction in impact toughness and increased susceptibility to intergranular corrosion. Additionally, the resistance to uniform corrosion decreased with increasing aging duration.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Bojana M. Radojkovic, Bore V. Jegdic, Dunja D. Marunkic, Jovanka N. Pejic, Andela R. Simovic, Vladan R. Cosovic, Jelena B. Bajat
Summary: This study examined the correlation between the degree of sensitization (DOS) and intergranular corrosion (IGC) and the electrical conductivity level in welded and non-welded AISI 304 stainless steel. The results showed a linear relationship between electrical conductivity and DOS for DOS values above 0.5%, while lower DOS values had a higher deviation from linearity. The presence of Cr-depleted areas near grain boundaries and the reduction of carbon content in the austenite lattice were found to increase the electrical conductivity of the steel.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Manlang Cheng, Pei He, Longlin Lei, Xin Tan, Xiangyu Wang, Yangting Sun, Jin Li, Yiming Jiang
Summary: Welding has a detrimental effect on the corrosion resistance of both 304 and newly developed steel QN1803. This is mainly attributable to element segregation and decreased pitting corrosion resistance in the fusion zone (FZ) of QN1803 compared to 304.
Article
Chemistry, Physical
Viera Zatkalikova, Milan Uhricik, Lenka Markovicova, Lenka Kucharikova
Summary: This paper investigates the corrosion behavior of sensitized AISI 304 stainless steel in acid chloride solution. The results show that sensitization significantly affects the corrosion resistance, and elevated temperature acts as an accelerating factor.
Article
Materials Science, Multidisciplinary
Wen Feng, Zheng Wang, Qiang Sun, Yiqiang He, Yuanxing Sun
Summary: In this study, thermomechanical processing was used to optimize the grain boundary character distribution (GBCD) of 304 austenitic stainless steel. The effect of GBCD evolution on intergranular corrosion (IGC) was investigated, and the results showed that the increase in low-1 coincident site lattice (CSL) boundaries improved the corrosion resistance of the steel.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Automation & Control Systems
Zhuangzhuang Hou, Shichao Xiu, Cong Sun, Yunlong Yao
Summary: In this study, the corrosion mechanisms on the ground surface in pre-stress grinding were explored, and grinding parameters that could help obtain a machined surface with higher corrosion resistance were pursued. It was found that proper pre-stress in grinding could improve the surface roughness of stainless steel, reduce surface defects, and enhance surface corrosion resistance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ghazal Sadat Sajadi, Seyed Mohammad Ali Hosseini, Vahid Saheb, Mehdi Shahidi-Zandi
Summary: In this study, the corrosion behavior of 304 Austenitic stainless steel (ASS) with different oxide layers developed at two temperatures was investigated using an asymmetric cells system. Valuable data was obtained from the asymmetric electrodes by analyzing the electrochemical current noise (ECN) signals through methods such as SDPS plot, recurrence plot (RP), and wavelet transform (WT) combined with electrochemical impedance spectroscopy (EIS). The results showed that the asymmetric electrodes exhibited a higher advantage in detecting intergranular corrosion (IGC) compared to the symmetric ones. The thickness of the passive oxide layer decreased with immersion time for the sample heated at 0-700 degrees C, while it increased for the sample heated at 1100-700 degrees C according to EIS measurements.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shunyu Yao, Hengbin Zhang, Fengcang Ma, Ping Liu, Lin Song, Wei Li, Ke Zhang, Xiaohong Chen
Summary: Grain boundary engineering (GBE) is a method to optimize the grain boundary characteristics of metals and improve their resistance to intergranular corrosion (IGC). This study quantitatively investigated the effect of various GBE processing on the fraction of low SCSL grain boundaries and random large-angle grain boundary connectivity in 304 stainless steel. The corrosion behaviors of samples with different grain boundary characteristics were studied in terms of the fractal dimension, and a correlation between the fractal dimension and the corrosion resistance was established.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xinli Jiang, Chongwen Yang, Wenqian Zhang, Xuelin Wang
Summary: Grain boundary engineering (GBE) can improve the resistance to intergranular corrosion (IGC) of polycrystalline metallic materials. The authors propose a novel method using surface mechanical grinding treatment and subsequent annealing to optimize the grain boundary character distribution (GBCD) in the near-surface layer. Experimentally, an optimized GBCD with over 75% frequency of coincidence site lattice (CSL) boundaries and disconnected random boundary network was achieved through gradient plastic strain and long-time annealing. Intergranular corrosion tests showed excellent resistance to IGC behavior in the resulting 304 stainless steels with the optimized GBCD in the near-surface layer.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Duane Armell T. Macatangay, Jenna M. Conrades, Keegan L. Brunner, Robert G. Kelly
Summary: Recent developments in 3D printing of austenitic stainless steels have highlighted the need for standardized electrochemical techniques to assess their corrosion resistance. Currently, ASTM standards focus on assessing resistance to various types of corrosion, but the additive process can lead to selective corrosion in microstructural features. This study characterizes the corrosion behavior of laser powder bed fusion stainless steel according to ASTM standards, paying special attention to melt pool boundary dissolution, cellular structures, and intergranular corrosion.
Article
Engineering, Mechanical
Willy Ank de Morais, Railson Bolsoni Falcao, Mario Boccalini Jr, Fernando Jose Gomes Landgraf
Summary: This study compares the fatigue behavior of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using two different types of powders (spherical powder produced by Plasma Atomization and irregularly shaped powder produced by Hydride-Dehydride). The results show that the fatigue behavior is similar for both powders, but the specimens produced from the Hydride-Dehydride powder have higher dispersed results. Fracture primarily occurs in the porosities near the machined sample surface, and the fatigue cracks propagate in a zigzag mode parallel to the L-PBF building direction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Guoxi Jing, Shuai Sun, Teng Ma, Shubo Li, Tian Ma, Junchao Wei, Jianchao Pang
Summary: This study proposes a parameter identification method for predicting the TMF life of CGI materials used in cylinder heads. The study evaluates the TMF behavior of RuT450 material and successfully predicts its TMF life using multi-objective optimization. The results highlight the influence of plastic strain amplitude, temperature, and strain rate on the damage mechanism and life prediction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Vivek Srivastava, Deependra Singh, A. G. Rao, V. P. Deshmukh
Summary: Engine gear failures are a significant concern in various industries. Investigating each gear failure and determining the root cause is important for preventing future failures. This study used experimental and numerical analysis techniques to investigate the premature failure of a flywheel gear in a marine diesel engine. The findings revealed that the gear failed due to overload stresses caused by overload torque generated from sudden inertial thrust in the internal combustionengine.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jun Zhang, Weidong Liu, Feilong Liu, Zhiqiang Yang, Jinfang Peng, Minhao Zhu
Summary: During a major overhaul of an aeroengine, a cracked stator vane of the low-pressure compressor was discovered, with the crack originating from a corrosion pit located on the arc transition between the leading edge and the upper edge plate. The fracture surface exhibited signs of fatigue cracks, indicating a pit-related fatigue crack. Metallographic examination revealed that most corrosion pits were distributed beneath the bulging or peeling paint layer on the leading edge and the concave side. Identification of the corrosion products showed the presence of sulfate and alumina, suggesting atmospheric corrosion as a likely cause for the cracked stator vane.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Juan Jose Jimenez de Cisneros Fonfria, Ester Olmeda, Susana Sanz, Maria Garrosa, Vicente Diaz
Summary: Energy absorbing devices in vehicles can partially transform impact energy and protect passengers. In this paper, the failure analysis of the underframe crumple zone in a train car was conducted through finite element simulations, showing that the component acted properly after the impact.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Fengqi Zhang, Gang Luo, Haiyang Zhang, Peihong Cong, Lulu Liu, Wei Chen
Summary: In this study, a predictive model for bird strike trajectory was developed based on the quasi-linear viscoelastic model. By combining simulation analysis under multiple conditions, the model reproduced the trajectory change law in low and medium speed bird impact experiments.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
S. M. de Gouveia, L. de Abreu Correa, D. B. Teles, M. Oliveira, T. G. R. Clarke
Summary: Emergency Shutdown Valves (EDSVs) are used in industrial applications to interrupt fluid flow during hazardous events. The damage to the valve seats can be detected by analyzing the pressure and torque data. This study compared three processing options and found that evaluating the complete signature with a Gradient Boosting Classifier algorithm is the most effective strategy.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xinyan Jin, Kai Wang, Hongwei Qian
Summary: This study investigated the root cause of an abnormal premature groove-clogging failure on a sink roll in a hot-dip galvanizing line. It was found that the failure was caused by the buildup of a large amount of Fe2Al5Znx dross in the grooves, and the key factor was the control of Tstrip.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Zhiqiang Li, Jie Li, Cen Li, Xiaodong Xie, Zhiyong Yang
Summary: In this study, the microstructure evolution of the material in the hot spot area of the high-speed train brake disc was observed and the mechanism of mechanical property degradation was obtained through tensile tests. The research results provide guidance for crack damage identification of the brake disc and condition-based maintenance.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Lijia Luo, Yincheng Wang, Wei Chen, Zuming Zhao, Wenfei Chen, Shiyi Bao
Summary: Tube-to-tube impact wear is a significant factor in the failure of alloy 690 tubes in nuclear steam generators. This paper investigates the wear damage mechanism and detection method of alloy 690 tubes under tube-to-tube impact loads. The results reveal the wear damage mechanism through analysis of macro and micro morphologies as well as metallographic structures. A nonlinear ultrasonic wave mixing method is proposed for damage detection and a detection device is developed to implement this method. Experimental results indicate that the damage mode of tube-to-tube impact wear varies with impact load and cycle number, and the nonlinear modulation index is effective in assessing the damage degree of alloy 690 tubes.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xing-Ju Yang, Feng Lin, Xu Du, Lu Qiu
Summary: This paper proposes a novel method of improving the progressive collapse resistance of RC frame structures by adding locally debonded kinked steel plates (KPs). Experimental tests and finite element analysis reveal that the addition of KPs significantly enhances the ultimate resistance and deformability of the beam-slab substructures. The mechanism of resistance improvement is explained, and an analytical model is developed for predicting the ultimate resistance of the structures.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xiaohe Wang, Zengqiang Cao
Summary: This paper presents a dynamic installation (DI) method based on electromagnetic force to reduce damage to composite laminates and improve joint performance. The study shows that DI can effectively decrease installation resistance, reduce severe damage to laminates, and improve stress distribution in the joint.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jitong Cui, Yingying Kong, Cuiwei Liu, Baoping Cai, Faisal Khan, Yuxing Li
Summary: This paper presents a method for quantifying the failure probability of hydrogen doped pipelines and utilizes Bayesian network for quantitative calculation. The results show that this method can more accurately assess the failure probability of hydrogen doped pipelines and provide a decision basis for preventing failure accidents.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Yiping Jiang, Maoru Chi, Jungang Yang, Liangcheng Dai, Yuchen Xie, Zhaotuan Guo
Summary: This article investigates and simulates the derailment of empty freight trains at the switch section of a turnout in the diverging route, and proposes preventive measures. The results show that the derailment is caused by the combined effect of various factors, and reducing the longitudinal coupler force and the wheel rail friction coefficient can decrease the possibility of derailment. Additionally, installing a guard rail in front of the turnout can effectively prevent derailment.
ENGINEERING FAILURE ANALYSIS
(2024)