The effect of ligament size on the thermal fatigue life of 9Cr 1Mo steel boiler header under cold, warm and hot starts

Selvan, R. Vetri; Sathiya, P.; Devakumaran, K.; Ravichandran, G.

doi:10.1016/j.engfailanal.2019.01.005

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…During their operation, high stresses occur in thick-walled pressure elements. Cyclical work caused by cooling and heating processes can cause the phenomenon of low-cycle fatigue and even lead to fatigue damage [1]. An old forced circulation dual-fuel subcritical power boiler was analyzed to reduce cyclic stress [2].…”

Section: Introductionmentioning

confidence: 99%

Identification of thermal and strength phenomena in power installations

Duda,

Konieczny

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The aim of this work is to show the inverse method, which can be used to determine the transient stress distribution caused by pressure and a variable temperature field. The method is fast enough to be used online in systems monitoring the thermal and strength condition of selected elements. The solution is possible despite the lack of information about the thermal boundary condition on the inner surface of the tank. The lack of data on the phenomena occurring inside the collector may be caused by the inability to install measuring sensors. Computational Fluid Dynamics (CFD) can take a long time to analyze complex phenomena on the inner surface of a collector, making it difficult to apply the method online. Solving the inverse problem is possible thanks to the measured temperature transients at selected points inside or on the outside of the component. After identifying the temperature distribution, stresses are determined using the finite element method. Then the maximum stresses can be compared with the permissible values, which allows the assessment of the operational safety of the element.

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Section: Introductionmentioning

confidence: 99%

Identification of thermal and strength phenomena in power installations

Duda,

Konieczny

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The increase in boiler temperature and pressure has led to different degrees of damage to pressure-bearing components. The fillet weld of the header pipe works under harsh conditions, and weld cracking often occurs, which leads to leakage accidents and seriously affects the normal operation of generator set [1][2][3][4]. Welding is a complex process involving arc physics, heat and mass transfer, metallurgy, and mechanics.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interlayer Temperature and Welding Sequence on the Temperature Distribution and Welding Residual Stress of the Saddle-Shaped Joint of Weldolet-Header Butt Welding

Mai

Zhang

et al. 2021

Materials

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In this paper, based on Simufact Welding finite element analysis software, a numerical simulation of the temperature and residual stress distribution of the weldolet-header multi-layer multi-pass welding process is carried out, and the simulation results are verified through experiments. The experimental results are in good agreement with the numerical simulation results, which proves the validity of the numerical simulation results. Through the results of the numerical simulation, the influence of the welding sequence and interlayer temperature on the temperature and residual stress distribution at different locations of the saddle-shaped weld was studied. The results show that the temperature and residual stress distribution on the header and weldolet are asymmetric, and the high-stress area of the saddle-shaped welded joint always appears at the saddle shoulder or saddle belly position. When the interlayer temperature is 300 °C, the peak residual stress reaches a minimum of 428.35 MPa. Adjusting the welding sequence can change the distribution trend of residual stress. There is no high-stress area on the first welding side of the two-stage welding path-2. The peak values of residual stresses for continuous welding path-1 and two-stage welding path-2 are 428.35 MPa and 434.01 MPa, respectively, which are very close to each other.

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Defect Remedy Procedures Using Cold Method on Superheater Header (SA335 P11)

Samsudin,

Andud

2024

Advanced Structured Materials

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The effect of ligament size on the thermal fatigue life of 9Cr 1Mo steel boiler header under cold, warm and hot starts

Cited by 8 publications

References 11 publications

Identification of thermal and strength phenomena in power installations

Identification of thermal and strength phenomena in power installations

Influence of Interlayer Temperature and Welding Sequence on the Temperature Distribution and Welding Residual Stress of the Saddle-Shaped Joint of Weldolet-Header Butt Welding

Defect Remedy Procedures Using Cold Method on Superheater Header (SA335 P11)

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