Effect of Residual Stress on Crack Development in Longitudinal Welded Joints of a Gas Pipeline

Golikov, N. I.

doi:10.1016/j.prostr.2020.12.006

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The obtained results can be used during the production of other types of pipes [15,16], including drilling [17] and high pressure pipelines of hydraulic equipment [18] of stationary and transport machines. The applied research approaches can be used in related in dustries [19,20].…”

Section: Fig 2 Rolling Cone In the Mill Of Cold Rolling Of Pipesmentioning

confidence: 99%

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Holovchenko,

Grigorenko,

Protsiv

2023

Nauk. visn. nat. hirn. univ.

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Purpose. Experimental study on microstructure, mechanical properties of pipe diversity on a new type of cold rolling pipe, which has the ability to perform different modes of supply and rotation. Methodology. Research method is an experimental one on modern industrial equipment using modern devices. The study was conducted when rolling pipes made of steel 08Cr18Mn10Ti on the CRP 6-20 mills. Rolling route is often 25 × 2.5 mm ® 16 × 1.5 mm, which is often used in production. Rolling was carried out on the CRP 6-20 mills in four modes of feed and rotation: mode 1 – feed is performed before the forward stroke, and rotation before the return stroke of the stand; mode 2 – the feed is performed before the forward stroke, and the rotation before the forward and reverse stroke of the stand; mode 3 – feeding is performed in the front and rear position of the stand and rotation in the rear position of the stand; mode 4 – feed and turn are performed before the forward and reverse of the stand. Findings. Metallographic studies on microstructures showed that for mode 1, the grain size on the outer surface of the pipes is less than on the inner surface. The difference reaches the value of 1–2 points. For mode 4, the opposite is true. The size of the grains on the outer surface of the pipes is larger than on the inner surface. The difference reaches the value of 1–2 points. This can be explained by the fact that in mode 1 most of the compression is performed in the forward stroke rather than in reverse stroke. And in mode 4, these crimps are close in value and smaller than in a forward stroke in mode 2. Originality. New experimental industrial data have been obtained for the first time on the state-of-the-art cold rolling mill for small-diameter pipes made of microstructures of riveted steel 08Cr18Mn10Ti in cross-sectional and longitudinal sections of the pipes on the outer and inner surfaces of the pipes and between them for four possible feeding and turning modes. For the first time, experimental industrial data on the values of strength limit, yield strength and ultimate elongation at four feeding and turning modes have been obtained as well. Practical value. The obtained experimental industrial data from a set of quality parameters of pipes – metal microstructure, mechanical properties, transverse differences in pipe packages allow one to choose modes of supply and rotation in the production of cold-formed pipes to ensure compliance with regulated quality parameters of supply and rotation pipes.

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Section: Fig 2 Rolling Cone In the Mill Of Cold Rolling Of Pipesmentioning

confidence: 99%

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Holovchenko,

Grigorenko,

Protsiv

2023

Nauk. visn. nat. hirn. univ.

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“…In this work, it is also reported that the residual stresses induced on the I/S of the pipe are tensile. An increase in the outer diameter of the cylinder increases the bending in welded cylinders [12]. Experimental investigations on longitudinally welded pipes revealed the cracks initiated on the I/S of the cylinder, where the residual stresses are tensile and maximum [13].…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical investigation of residual stresses in circumferential and longitudinal welded joints

2022

IJATEE

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Welding is a fabrication technique where several variables are involved, which affect the output. Thus, making it a complex manufacturing technique. Welding is being used commonly in power plants, aerospace, marine and pressure vessel applications. Residual stress is one of the detrimental effects which is induced due to welding. Residual stresses induced in the base metals produce distortions such as buckling and bending [1]. The magnitude of peak residual stresses will be in the range of yield strength of the metal. Weld distortions significantly ruin the performance and reliability of the welded components [2]. In case of welded cylinder structures, the residual stress variation and distortion are more complex as it produces axial and circumferential shrinkages in the cylinder. Circumferential and longitudinal welded cylinders are used in piping systems carrying fluids at very high temperature [3].

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“…One can take advantage of these stresses, purposely causing compressive residual stresses into the surface layer of components to improve fatigue life [ 11 , 12 ]. Contrarily, during operation, the residual tensile stress that appears in the material will facilitate the initiation and propagation of cracks [ 13 , 14 ], which should be avoided as far as possible. A wealth of research has established that residual stresses can alter the mechanical and functional performance of different engineering systems [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress Induced by Different Cooling Methods in Heat Treatment on the Fatigue Crack Propagation Behaviour of GH4169 Disc

Fan

Chen

et al. 2022

Materials

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In this study, the effects of residual stress induced by three different cooling methods during heat treatment on the crack propagation behaviour of the GH4169 disc were investigated. Different levels of stress fields were induced to the specially designed discs by using air cooling (AC), air jetting cooling (AJC) and water quenching (WQ) methods and were quantitated by numerical simulation. These discs were then subjected to prefabricated cracking, and crack propagation tests were conducted on a spin tester with two load spectrums. Crack growth behaviour was depicted via the surface replica technique and fracture morphology. Regarding the linear superposition of residual stress and centrifugal force, the crack propagation behaviour of different discs was simulated using the FRANC3D software. AJC and WQ introduced compressive residual stress (−259 MPa and −109 MPa, respectively) into the disc compared with the AC method (about −1.5 MPa). The AJC method increases the crack propagation life of the disc by introducing residual compressive stress into the area near the surface of the central hole to inhibit the opening of the crack surface. When the fatigue load was low, this inhibition effect was more significant.

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Effect of Residual Stress on Crack Development in Longitudinal Welded Joints of a Gas Pipeline

Cited by 5 publications

References 6 publications

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Numerical investigation of residual stresses in circumferential and longitudinal welded joints

Effect of Residual Stress Induced by Different Cooling Methods in Heat Treatment on the Fatigue Crack Propagation Behaviour of GH4169 Disc

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