Microstructures and Mechanical Properties of 12Cr1MoVG Tube Welded Joints With/Without Post-weld Heat Treatment

Wang, Jingjing; Sun, Jian; Yu, Xinhai; Chen, Guohong; Fu, Qiuhua; Gao, Changyong; Tang, Wenming

doi:10.1007/s11665-017-2936-8

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…For axial stress S22, although the stress distribution along outer surface P1 is different from that along inner surface P2, but there is no change in the residual stress reduction effects of different heat treatment processes. In the study of residual stress of 12Cr1MoVR tube welded joints with/without PWHT by Wang et al [16], only the residual stress distribution of the weld and HAZ was studied, but the difference in the residual stress distribution between the inner and outer surfaces of the pipeline was not studied. Figure 12 compares the hoop stress S11 and the axial stress S22 after different heat treatment along outer surface P1 and inner surface P2, respectively.…”

Section: Comparison Of Residual Stress Reduction Effects Of Differentmentioning

confidence: 99%

“…Up to now, there are many methods to reduce welding residual stress including pre-heating [10], temper bead welding [11], post-weld heat treatment, hammering, vibration aging, ultrasonic impact, and so on. Compared with other methods, post-weld heat treatment can not only reduce the welding residual stress effectively, but also improve the mechanical performance of the welded joint [12][13][14][15][16]. Therefore, post-weld heat treatment is the main method to eliminate welding residual stress in engineering application.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Liu

Zheng³

et al. 2021

Metals

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In order to clarify the role of different post-weld heat treatment processes in the manufacturing process, welding tests, post-weld heat treatment tests, and finite element analysis (FEA) are carried out for 12C1MoV steel pipes. The simulated temperature field and residual stress field agree well with the measured results, which indicates that the simulation method is available. The influence of post-weld heat treatment process parameters on residual stress reduction results is further analyzed. It is found that the post weld dehydrogenation treatment could not release residual stress obviously. However, the residual stress can be relieved by 65% with tempering treatment. The stress relief effect of “post weld dehydrogenation treatment + temper heat treatment” is same with that of “temper heat treatment”. The higher the temperature, the greater the residual stress reduction, when the peak temperature is at 650–750 °C, especially for the stress concentration area. The longer holding time has no obvious positive effect on the reduction of residual stress.

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Section: Comparison Of Residual Stress Reduction Effects Of Differentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Liu

Zheng³

et al. 2021

Metals

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“…Jiang Feng et al discovered that post-weld heat treatment improved the cast structure significantly in the weld zone of Al-Mg-Sc alloy welded joints, leading to a substantial increase in both strength and toughness [29]. Wang et al found that post-weld heat treatment promotes the decomposition of pearlite in 12Cr1MoV seamless steel pipe welded joints, as well as the growth of ferrite grains and carbides, thus reducing yield strength, tensile strength, and hardness but enhancing the toughness and elongation [30].…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Heterogeneous Microstructure of a 12Cr1MoV Welded Joint after Post-Weld Heat Treatment and Its Effect on Mechanical Properties

Yang,

Sun,

et al. 2023

Metals

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The non-uniformity of microstructures and mechanical properties across a whole welded joint is a crucial factor leading to its weakening performance and premature failure. Post-weld heat treatment is a primary method for increasing the mechanical properties. However, the evolution mechanism of mechanical properties related to heterogeneous microstructure after heat treatment remains unclear, making it challenging to design the heat treatment process and evaluate its effect comprehensively. In this study, microstructure characterization and a series of mechanical tests of 12Cr1MoV welded joint after the stress relief annealing (SRA) and tempering heat treatment (THT) were conducted. The effect of heat treatment on mechanical properties is analyzed based on the comparison between stress relief annealing and tempering heat treatment in terms of tensile properties, impact toughness, and impact fracture morphology. The results indicate that, after the tempering heat treatment, the evolution of mechanical properties in each subzone of the joint is consistent, i.e., the hardness and tensile strength decreased while the toughness increased. Notably, the most substantial enhancement in toughness is observed in the weld zone, primarily due to a significant reduction in the presence of pre-eutectoid ferrite. Furthermore, it is proved that hardness is an indicator to reflect changes in tensile strength related to the microstructure evolution, which indicates it can be employed to evaluate the effectiveness of post-weld heat treatment in practical engineering.

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“…As pearlite heat-resistant steels are used to manufacture superheater tubes and steam pipes, they require sufficient oxidation resistance, thermal strength, and corrosion resistance for long-term operation. In the past, most studies focused on the mechanical and chemical properties of pearlite heat-resistant steels [1][2][3]. These studies were based on the observation of samples obtained at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and microstructure evolution of pearlite heat-resistant steel during heating

Liu

et al. 2020

Materials Science and Technology

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The phase transformation and microstructure evolution of pearlite heat-resistant steel during heating were observed with an ultra-high temperature confocal scanning laser microscope. The α-ferrite completely disappeared earlier than Fe3C during the formation of γ-austenite, which is inconsistent with the fact that the Fe3C should disappear completely earlier under equilibrium conditions. After the Fe3C + α→γ transformation, static recrystallisation of γ-austenite occurred, accompanied by the dissolution of cementite. During the γ→δ transformation, the δ-cell first precipitated at the triple point of the γ-austenite grain boundaries, and then the δ-cell platelet with one tip appeared in the γ-austenite grain. The law of δ/γ inter-phase boundaries was analysed based on inter-phase boundary types and element diffusion.

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Microstructures and Mechanical Properties of 12Cr1MoVG Tube Welded Joints With/Without Post-weld Heat Treatment

Cited by 4 publications

References 4 publications

Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Evolution of the Heterogeneous Microstructure of a 12Cr1MoV Welded Joint after Post-Weld Heat Treatment and Its Effect on Mechanical Properties

Phase transformation and microstructure evolution of pearlite heat-resistant steel during heating

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