Microstructure and Mechanical Characteristics of Dissimilar TIG Welded 9% Cr Heat-Resistant Steels Joints

Li, Ting; Yuan, Xinjian; Li, Rui; Xiong, Jiankun; Tao, Shiwei; Wu, Kanglong

doi:10.1007/s12541-021-00517-x

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…Li et al 21 welded dissimilar 9%Cr heat-resistant steels (G115 and CB2) by tungsten inert gas welding and studied the microstructure and mechanical properties of the welding metal. Maduraimuthu et al 22 , studied the effects of TIG and A-TIG welding processes on the microstructure and mechanical properties of P92 steel welded joints and confirmed that the precipitates at the grain and slab boundaries were *e-mail: liupeng1286@163.com M 23 C 6 type carbides, and the precipitates in the grain were MX type niobium and vanadium rich nitrides and carbides.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

et al. 2023

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In this paper, the multi-layer multi-pass welding process was used to weld 115mm 08Cr9W3Co3VNbCuBN (G115) steel pipe, the gas tungsten arc welding (GTAW) was used in root pass welding, subsequent welding by dynamic hot wire gas tungsten arc welding (TIP TIG) welding method, while the post-weld heat treatment (PWHT) of 770°C × 10h was carried out afterward. The microstructure and mechanical properties of different zones of the welded joint were analyzed by OM, SEM, XRD, microhardness and impact tests. The results showed that the ferrite and martensite were observed in the weld metal (WM), the fine-grained heat-affected zone (FGHAZ) and the coarse-grained heat-affected zone (CGHAZ) consisting of prior austenitic grain boundaries (PAGBs) and martensite, and more precipitates including coarse M 23 C 6 carbides with fine MX-type carbonitrides were observed inside the grain boundaries and grains. The hardness distribution patterns along different locations (Cover, Fill, Root) on the welded joint cross-section were the same, from base metal (BM) to WM hardness gradually increased, and WM hardness was the highest. WM impact toughness was worse than HAZ, impact fracture mode was a mixed tough-brittle fracture but biased towards brittle fracture.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

et al. 2023

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“…[ 11,14 ] Prior research on CB2 alloy focused mainly on its creep performance and structure evolution under static stresses. [ 15–18 ] Jandova et al [ 16 ] reported that the time to rupture for this steel was 82 649 h at 650 °C and 60 MPa. Gao et al [ 17 ] revealed that the rupture times were 942 and 5075 h at 650 °C/120 MPa and 620 °C/120 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…These results show that this 9Cr steel has good creep resistance at temperature above 600 C. During long-term creep exposures, the microstructure evolution including the coarsening of M 23 C 6 , the precipitation and growth of Laves phase and Z-phase, and the recovery of martensitic laths was the main cause of the decrease of strength and the occurrence of rupture. [15][16][17][18] Our study applied strain-rate jump tests recommended by Mecking et al [19] on samples of 9Cr-1.5Mo-1Co-VNbBN (i.e., CB2) steel at 600-650 C. We present the steady-flow deformation characterized at elevated temperatures. The deformation mechanism is also evaluated and discussed.…”

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confidence: 99%

Plastic Flow Behavior of an Advanced 9Cr Martensitic Heat‐Resistant Steel at High Temperatures

Gao

Zhang

2021

steel research int.

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Advanced 9Cr–1.5Mo–1Co–VNbBN martensitic steel is used for thick castings under ultra‐supercritical conditions. The microstructure, including martensitic laths, dislocations, and precipitations, is observed before and after deformation by transmission electron microscope. Steady‐state flow behavior and deformation mechanisms are investigated by analyzing strain‐rate jump test data at 600–650 °C. Results show that the plastic flow behavior of 9Cr steel is well characterized by a stress power law whose apparent stress exponent n is between 20.5 and 27.0 for the three test temperatures. The apparent activation energy of 621 kJ mol is estimated for the plastic flow of this steel, and the stress exponent and apparent activation energy are particularly high. The analysis incorporates the effect of a threshold stress, which is associated with the pinning effect of particles on dislocations. The truly modified stress exponent n0 is 4.6 at all test temperatures after removing the threshold stress, which is close to that of dislocation‐climb deformation, indicating the deformation of this steel can be described as a lattice diffusion‐controlled dislocation‐climb mechanism. Transmission electron microscopy observation is conducted to characterize the interaction of dislocation–precipitate to provide structural evidence for specific deformation mechanisms.

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Advanced Surface Engineering Approaches for Exotic Applications

Mohanty

Basak

Saran

et al. 2023

Int. J. Precis. Eng. Manuf.

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Microstructure and Mechanical Characteristics of Dissimilar TIG Welded 9% Cr Heat-Resistant Steels Joints

Cited by 7 publications

References 28 publications

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

Plastic Flow Behavior of an Advanced 9Cr Martensitic Heat‐Resistant Steel at High Temperatures

Advanced Surface Engineering Approaches for Exotic Applications

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