International Journal of Pressure Vessels and Piping最新文献

{"title":"Corrigendum to “Improving fatigue testing of AISI 304L stainless steel in high temperature water regarding their complex hardening and softening material behaviour” [Int. J. Pres. Ves. Pip. Volume 218 Part B (2025) 105612]","authors":"Georg Veile , Jürgen Rudolph , Nina Grözinger , Martin Herzig , Michael Grimm , Stefan Weihe","doi":"10.1016/j.ijpvp.2025.105679","DOIUrl":"10.1016/j.ijpvp.2025.105679","url":null,"abstract":"","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105679"},"PeriodicalIF":3.5,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145747328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Creep deformation behaviour of Grade 91 steel and its weld joints: A comparative study","authors":"Sumit Kumar Mohanty ,&nbsp;Swarnalata Behera ,&nbsp;Chandan Pandey ,&nbsp;Krishna Guguloth","doi":"10.1016/j.ijpvp.2025.105678","DOIUrl":"10.1016/j.ijpvp.2025.105678","url":null,"abstract":"<div><div>Grade 91 steel is widely used in the power plants for high-temperature applications. The tested specimens were fabricated from base metal and welded portions of Grade 91 steel for conducting tensile and creep tests in the temperature range of 575–675 °C and the stress range of 60–220 MPa, respectively. Understanding the creep deformation behaviour of Grade 91 steel up to rupture at different applied stresses is essential for ensuring reliable creep life and safe operation of the structural components of the power plants. The rupture times were obtained from 15 h to 5208 h for the samples of BM and WM. The stress dependence of minimum creep rate and rupture time is followed the Norton power law and the stress exponents were found in the range of 4.6–19.3 for the temperature range of 575–675 °C. The strain-hardening exponent is also substantially increased at 625 °C during tensile behaviour, which presence of MX precipitates. The higher stress exponent resulted at 575 °C and 625 °C, is mainly due to interaction of dislocations with the precipitates and grain boundaries. Furthermore, threshold stress analysis is performed for the base metal and weld joints to find the operating mechanism of creep. By considering threshold stresses, the true stress exponents are found to be approximately 4.6 and 5.1 within the temperature range of 575–675 °C, confirmed as dislocation climb is the rate-controlling mechanism of creep. The minimum creep rate and rupture time data followed Monkman-Grant relationship. The selected samples were taken for characterization using optical microscopy and scanning electron microscopy. The elemental compositions of the precipitates were analyzed using energy dispersive X-ray spectroscopy. This study gives an understanding of the role of microstructure on creep rupture behaviour of Grade 91 steel in the base metal and weld joints.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105678"},"PeriodicalIF":3.5,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Failure investigation of the inconel 783 alloy bolt used in an ultra-supercritical power plant","authors":"Haiyue Pang ,&nbsp;Qu Liu ,&nbsp;Zhipeng Cai ,&nbsp;Kejian Li","doi":"10.1016/j.ijpvp.2025.105676","DOIUrl":"10.1016/j.ijpvp.2025.105676","url":null,"abstract":"<div><div>This study investigates the failure of an Inconel 783 alloy bolt that fractured during service in a medium-pressure control valve of an ultra-supercritical power unit. The failure mechanism was analyzed through fractographic observation, metallographic examination, and finite element analysis. The results indicate that the bolt failed via sudden fracture initiated by fatigue crack propagation. The failure process involved three stages: (1) fatigue crack initiation and growth from a surface scratch to a depth of approximately 1 mm; (2) subsequent crack extension dominated by stress-accelerated grain boundary oxidation (SAGBO); and (3) final fracture when the crack reached a critical length of about 15 mm. Two primary contributing factors were identified. First, improper heat treatment during manufacturing resulted in an insufficient precipitation of secondary β phase along the grain boundaries, which significantly reduced the material's resistance to SAGBO. Second, a pronounced negative creep phenomenon was observed, which was attributed to the incomplete precipitation of the γ′ strengthening phase in the as-received material. This negative creep led to an abnormal increase in the actual service stress by approximately 22.3 %, further accelerating both fatigue crack initiation and SAGBO-driven crack growth. This work provides a technical reference for the failure prevention of Inconel 783 bolts under high-temperature and high-stress service conditions.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105676"},"PeriodicalIF":3.5,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145289780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of mixed mode I/III fracture of 14MoV6-3 power plant steel using 3D-digital image correlation","authors":"Benard Kipsang ,&nbsp;Behzad Vasheghani Farahani ,&nbsp;Krzysztof Wacławiak ,&nbsp;Wim De Waele","doi":"10.1016/j.ijpvp.2025.105681","DOIUrl":"10.1016/j.ijpvp.2025.105681","url":null,"abstract":"<div><div>Considering the complex stresses in power boiler piping and the oblique orientation of cracks, mixed mode I/III loading plays a significant role in crack propagation during service. This research investigates the fracture characteristics of 14MoV6-3 power plant steel under mixed mode I/III loading. Experimental techniques are implemented using the 3D full-field Digital Image correlation (DIC) tool to measure the Crack Tip Opening Displacement (CTOD) in quasi-static loading conditions. Single Edge Notch Tension (SENT) specimens are used to assess tilted notches' effect on their tearing resistance. Three different notch angles 0⁰, 22.5⁰, and 45° are assessed. The contribution of mode III CTOD to crack opening is quantified. In all cases, it can be inferred that the fracture toughness under mixed mode I/III loading is slightly higher than under mode I loading. Numerically, the problem is solved using the finite element method, FEM, formulation extended to the fracture mechanics theory in which J-Integral is acquired and compared to the experimental solution, a good agreement was verified. The mode-I Stress Intensity Factor (SIF) is calculated from the DIC data using the overdeterministic algorithm to obtain an alternative solution and assess the experimental campaign's robustness. Therefore, a comprehensive comparison is drawn amongst all acquired results. Furthermore, the fracture resistance (R-curves) of the different notch angles is experimentally evaluated.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105681"},"PeriodicalIF":3.5,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of installation deviation on the natural characteristics of hydraulic L-shaped pipelines: Simulation and experimental study","authors":"Chengbo Wang ,&nbsp;Xumin Guo ,&nbsp;Longfei Chi ,&nbsp;Guoxiong An ,&nbsp;Tianyu Zhao","doi":"10.1016/j.ijpvp.2025.105680","DOIUrl":"10.1016/j.ijpvp.2025.105680","url":null,"abstract":"<div><div>The dynamic research of hydraulic pipelines has received widespread attention. The pipelines laid outside the aero-engine inevitably have assembly deviations, which may affect the vibration state of the pipelines. However, fluid-coupled modes analysis of pipelines considering installation deviations is very limited. Given this situation, this paper proposes a hydraulic pipeline dynamic model considering installation deviation based on Timoshenko beam theory and the incremental analysis method. The equivalence of the fluid is achieved through the addition of the stiffness matrix and damping matrix, and the installation deviation is characterized by the initial displacement matrix. A fluid-coupled modal analysis of the hydraulic pipeline with installation deviations is conducted based on the established model. The accuracy of the pipeline model is validated through literature and modal experiments on pipelines with installation deviations. The natural frequencies of the L pipeline under the combined effects of flow velocity, pressure, and installation deviations are analyzed. The results show that the natural frequency of hydraulic pipelines with installation deviation decreases with the increase of fluid velocity and pressure, and this change dominates, while the impact of installation deviation on the natural frequency of hydraulic pipelines is relatively weak. Axial installation deviations have a more pronounced effect on L-shaped pipelines compared to lateral deviations. Specifically, as the axial tensile installation deviation increases, the natural frequency of the pipeline also rises, and this law changes with the change of boundary conditions. This study can provide potential technical support and theoretical guidance for pipeline dynamics analysis and fault diagnosis with installation deviation in engineering.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105680"},"PeriodicalIF":3.5,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating metallurgical integrity and temperature-dependent mechanical performance of multi-pass dissimilar welds between a cast nickel-based 625 superalloy and 304H stainless steel","authors":"Gopal Ji Rai,&nbsp;Suhrit Mula,&nbsp;Gautam Agarwal","doi":"10.1016/j.ijpvp.2025.105670","DOIUrl":"10.1016/j.ijpvp.2025.105670","url":null,"abstract":"<div><div>Increasing energy consumption brings significant challenges, including increased greenhouse gas emissions and rising costs. To overcome these issues, Advanced Ultrasupercritical (AUSC) thermal power plants are proposed to operate at high steam temperatures (983 K) and pressures (310 bar). To meet this demand, materials should be able to withstand the harsh environments during service life. Considering cost-effectiveness, cast Superni 625, an Indian equivalent of Inconel 625, is proposed for high-temperature applications, whereas 304H austenitic stainless steel is recommended for moderately high temperatures. Joining these two alloys, thus, assumes importance, and integrity of the dissimilar welds at high service temperatures becomes critical. In this work, 304H ASS and Superni 625 alloy were welded using ERNiCrMo-3, a Mo-rich filler metal, by multi-pass gas tungsten arc welding (GTAW). Macro &amp; microstructural analyses demonstrated the formation of a sound joint. The weld metal (WM) predominantly comprised an austenite phase, exhibiting distributions of Mo and Ti/Nb carbides within interdendritic areas. The micro-hardness assessment indicated the highest hardness at the filling area of the weld metal, whereas 304H base metal is the weakest zone. Tensile tests at 923 K on transverse specimens of the welded plates revealed failure within the 304H base metal, indicating superior weld metal tensile strength. Furthermore, tensile tests at 923 K on longitudinal specimens revealed the weld metal strength to be higher than either of the base metals. The higher strength of the weld metal than the Superni 625 base metal at high temperature is attributed to the absence of Laves phase in the weld metal and a more pronounced PLC effect. In addition, at high temperature, the strength of the heat-affected zone near the 304H base metal side was found to be higher than the 304H base metal, which is attributed to dynamic strain aging in the heat-affected zone. The V-notch Charpy impact toughness of the weld metal was found to be significantly higher (79.7 ± 4.04 J) than the acceptable value (47 J) as per the existing standard (EN ISO 3580:2017). Fractography showed dimples at room temperature that elongated with increased temperature. At 923 K, the fracture mode was primarily mixed, exhibiting dimples from micro-voids coalescence alongside faceted features. Through extensive weld metal characterization, it is concluded that the chosen welding method for dissimilar welding was performed successfully, which has applications at high temperatures, including AUSC.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105670"},"PeriodicalIF":3.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145320565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Explainable machine-learning-assisted failure analysis of moderately thick composite cylindrical shells under hydrostatic pressure","authors":"Wang Hao ,&nbsp;Zhan Ming ,&nbsp;Li Yongsheng ,&nbsp;Wang Lihui","doi":"10.1016/j.ijpvp.2025.105672","DOIUrl":"10.1016/j.ijpvp.2025.105672","url":null,"abstract":"<div><div>Moderately thick composite cylindrical shells are widely used in submarine pressure-resistant structures. This study employed machine learning to analyse the failure of moderately thick composite cylindrical shells under hydrostatic pressure. Ten moderately thick composite cylindrical shells were fabricated, and their failure behaviour was examined through hydrostatic experiments and finite element analysis (FEA). Subsequently, their failure modes were analysed using FEA. Furthermore, this study trained a TabNet model for predicting the failure pressure of moderately thick composite cylindrical shells, and the model's accuracy and interpretability were validated. The trained TabNet was used to analyse the interaction effects of a shell's length-to-radius ratio (<em>L</em>/<em>R</em>), thickness-to-radius ratio (<em>T</em>/<em>R</em>), and ply angle (<em>θ</em>) on failure pressure. The experimental failure pressures were consistent with the FEA predictions (average error = 1.53 %). The <em>T</em>/<em>R</em> threshold at which the failure mode changes from buckling instability to strength failure varied with the ply angle. The threshold was lowest for shells with ply angles of ±20° and ±30°, and shells with ±10° and 0°/90° ply angles consistently exhibited buckling instability. The TabNet model, which achieved an <em>R</em>² of 0.986 on the test set, had higher accuracy for failure pressure prediction than benchmark models did. Interpretability analysis revealed that <em>θ</em> and <em>T</em>/<em>R</em> are the dominant factors affecting a shell's failure pressure. Failure pressure increases to the greatest degree as <em>T</em>/<em>R</em> increases for shells with ply angles of ±60° to ±80°. Conversely, failure pressure decreases most markedly with increasing <em>L</em>/<em>R</em> within the same ply angle range. Moreover, if <em>L</em>/<em>R</em> or <em>T</em>/<em>R</em> is increased, the optimal alternating ply angle for maximising failure pressure tends to slightly decrease. The findings of this study offer guidance for the design of pressure-resistant composite shells used in submarine applications.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105672"},"PeriodicalIF":3.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution, creep damage mechanism and failure risk of P92 steel welded joints after long-term service","authors":"Lipeng Cai ,&nbsp;Lei Zhao ,&nbsp;Kai Song ,&nbsp;Lianyong Xu ,&nbsp;Yongdian Han ,&nbsp;Kangda Hao ,&nbsp;Qingfeng Wang ,&nbsp;Derui Guo","doi":"10.1016/j.ijpvp.2025.105677","DOIUrl":"10.1016/j.ijpvp.2025.105677","url":null,"abstract":"<div><div>To ensure safe and reliable operation of high-temperature power plant components, it is crucial to evaluate the failure risk of P92 steel welded joints after long-term service. This study systematically investigated microstructural evolution and creep damage mechanisms using a multi technique characterization approach to analyze weld metal (WM), coarse grained heat-affected zone (CGHAZ), fine grained heat-affected zone (FGHAZ), and base metal (BM). Results revealed pronounced softening in the FGHAZ, with microhardness declining to 175 HV10, while repair welding partially restored microstructure and hardness in WM and CGHAZ. Degradation in FGHAZ, including precipitate coarsening and lath structure loss, remained largely irreversible. Creep cavities preferentially nucleated at δ-ferrite, grain boundary triple junctions, and coarse M₂₃C₆ and Laves phases. TEM observations showed extensive dislocation entanglement and slip around coarse precipitates, facilitating microcrack initiation, whereas MX carbonitrides remained stable. EBSD analysis indicated severe microstructural degradation in FGHAZ, with reduced lath boundaries and kernel average misorientation, and increased fractions of recrystallized grains and subgrains, contributing to localized softening and elevated creep susceptibility. Based on these findings, a creep damage model governed by microstructural degradation and abnormal δ-ferrite distribution was proposed. Overall, the study identified δ-ferrite and coarse precipitates as primary damage nucleation sites, providing quantitative microstructural metrics to guide failure risk assessment and life prediction of P92 welded joints after long-term service.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105677"},"PeriodicalIF":3.5,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simplified formulation of the Beremin model's industrial variation for pressurized thermal shocks","authors":"S. Chapuliot,&nbsp;C. Sénac","doi":"10.1016/j.ijpvp.2025.105674","DOIUrl":"10.1016/j.ijpvp.2025.105674","url":null,"abstract":"<div><div>This paper presents the development of a semi-analytical version of the industrial variation of the Beremin model for brittle fracture exclusion. Such an approximate expression is needed for two branches of safety analysis: on the one hand, for probabilistic studies which cover a large set of material, loadings, and geometrical conditions, and on the other hand, for the severity ranking of thermomechanical transients in deterministic studies. First, this article offers a short synthesis on the industrial variation of the Beremin model. Then, the physical foundations of the semi-analytical formulation are detailed. Indeed, the latter is based on analytical developments of the stress field at the tip of a crack combined with simplifying assumptions that are checked on fracture mechanics specimen of various geometry and on reactor pressure vessels’ surface defects. Owing to these prior analyses, a simple formulation relying on three geometrical parameters and one material-dependent parameter is finally proposed. The accuracy of this semi-analytical formulation is established by a comparison to the detailed industrial variation of the Beremin model on two complex industrial applications.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105674"},"PeriodicalIF":3.5,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of corrosion effects on the performance of underground steel pipelines under blast loading and a solution for retrofitting","authors":"Mohammad Tabiee,&nbsp;Alireza Khaloo","doi":"10.1016/j.ijpvp.2025.105669","DOIUrl":"10.1016/j.ijpvp.2025.105669","url":null,"abstract":"<div><div>Pipelines have long been used for the transportation of strategic fluids worldwide. However, exposure to environmental conditions and extended service life significantly increase the risk of corrosion, which in turn reduces the structural strength of pipelines against external loads, particularly blast loading. This study numerically investigates the behavior of pipelines with internal and external corrosion subjected to blast loads. The use of fiber-reinforced polymers (FRP) is also examined as a retrofitting technique to enhance the blast resistance of corroded pipelines. A parametric study was performed to assess the influence of corrosion geometry and FRP thickness on the structural response. The results demonstrate that FRP effectively improves the blast performance of corroded pipelines under various conditions. Specifically, employing CFRP with half the pipe thickness reduces the maximum stress by over 30 % and decreases the maximum longitudinal and hoop strains by more than 55 % in certain cases. This study integrates blast–corrosion interaction with FRP retrofitting strategies within a validated Coupled Eulerian–Lagrangian (CEL) framework, providing a novel approach to assessing the dynamic performance of corroded pipelines. The findings offer quantitative engineering guidance for the protection and strengthening of buried pipelines subjected to extreme explosion scenarios.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105669"},"PeriodicalIF":3.5,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}