Characterization of mechanical properties, fatigue-crack propagation, and residual stresses in a microalloyed pipeline-steel friction-stir weld

Sowards, Jeffrey W.; Gnäupel‐Herold, Thomas; McColskey, Joseph D.; Pereira, Victor Ferrinho; Ramírez, Antonio J.

doi:10.1016/j.matdes.2015.09.049

Cited by 38 publications

(12 citation statements)

References 36 publications

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“…The hardness of SZ exhibits the minimum value and a sudden change takes place in TMAZ on AS where a peak value of 625 Hv exists halfway. In previous studies [45,46], the region of the abrupt change of hardness was defined as hard zone (HZ) and attributes this to a combination result of temperature, deformation, and material flow behavior. A common characteristic of HZ is the distinct band structure found in the TMAZ/SZ-AS and the hardening effect is attributed to local high flow stress.…”

Section: Micro-hardness Distributionmentioning

confidence: 99%

“…A common characteristic of HZ is the distinct band structure found in the TMAZ/SZ-AS and the hardening effect is attributed to local high flow stress. Sowards et al [46] believed that high flow stress existing in the alternative banding structure lead to a sudden hardness rise. When it comes to HAZ, regardless of which side, the hardness value climbs considerably to that of the BM, which results from the elevated volume fraction of martensitic caused by thermal history.…”

Section: Micro-hardness Distributionmentioning

confidence: 99%

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Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

Geng

Feng

et al. 2016

Metals

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High nitrogen martensitic stainless steel 30Cr15Mo1N plates were successfully welded by friction stir welding (FSW) at a tool rotation speed of 300 rpm with a welding speed of 100 mm/min, using W-Re tool. The sound joint with no significant nitrogen loss was successfully produced. Microstructure, mechanical and corrosion properties of an FSW joint were investigated. The results suggest that the grain size of the stir zone (SZ) is larger than the base metal (BM) and is much larger the case in SZ-top. Some carbides and nitrides rich in chromium were found in BM while not observed in SZ. The martensitic phase in SZ could transform to austenite phase during the FSW process and the higher peak temperature, the greater degree of transformation. The hardness of SZ is significantly lower than that of the BM. An abrupt change of hardness defined as hard zone (HZ) was found in the thermo-mechanically affected zone (TMAZ) on the advancing side (AS), and the HZ is attributed to a combination result of temperature, deformation, and material flow behavior. The corrosion resistance of SZ is superior to that of BM, which can be attributed to less precipitation and lower angle boundaries (LABs). The corrosion resistance of SZ-bottom is slight higher than that of SZ-top because of the finer grained structure.

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Section: Micro-hardness Distributionmentioning

confidence: 99%

Section: Micro-hardness Distributionmentioning

confidence: 99%

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

Geng

Feng

et al. 2016

Metals

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“…In order to improve the transportation efficiency and reduce the transportation cost of oil and gas pipelines, pipeline transportation has been developed to large diameter and thick wall, and the requirements for the strength and toughness of pipeline steel are also becoming higher [1][2][3][4].To the turn of the century, large diameter (ϕ 1219/1422 mm), thick-walled X80 pipeline (t≥8.4 mm) has become a modern [5][6][7][8][9] choice for pipeline construction, such as the second and third west-east gas line in China, the central Asia gas pipeline, the Russia's ucha pipeline, and the China to Russia pipeline which is been built, etc. With the mature development of metallurgical technology, the development and research of the higher level X90-X120 pipeline steels are also promoted on the basis of X80 steel research and application.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Embrittlement and Softening in Heat Affected Zone of High Strength X90 Pipeline Steels

Xiao

Zhou

et al. 2019

Soldag. insp.

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The embrittlement and softening behaviors in heat affected zone of X90 pipeline steel were studied, and the influence of weld thermal cycle on microstructure and mechanical properties were discussed by combining the effect of peak temperature on the phase transition point (Ar3). Results show that there are embrittlement and softening zones existed in heat affected zone of X90 pipeline steel. The peak temperature greatly affected the austenitizing and its grain size, thereby affected phase transition during cooling process. The embrittlement in critical heat affected zone at 750 °C was caused by brittle bainite and M /A islands formed during cooling, because little austenite was formed during heating. While, the embrittlement in coarse grain heat affected zone was caused by austenite grain coarsen, which transformed to the coarse bainite after cooling. The softening zone attributed to the polygonal ferrite and granular ferrite after cooling, which came from fine and ununiformed austenite formed during reheating process. Ar3

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“…Fratini et al [4] found that the residual stress had an influence on the crack propagation of base metal area and had no obvious effect on the welding area. The effect of residual stress on the joint would weaken with the increase of fatigue cycle or the crack length [18,19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Residual Stress on Fatigue Weak Areas and Simulation Analysis on Fatigue Properties Based on Continuous Performance of FSW Joints

Sun

Wei

Niu

et al. 2019

Metals

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The fatigue weak area of aluminum alloy for a friction stir-welded joint is investigated based on the hardness profile, the residual stress measurement and the simulation analysis of fatigue property. The maximum residual stresses appeared at the heat-affected zone of the joint in the fatigue damage process, which was consistent with the fracture location of the fatigue specimen. The fatigue joint model of continuous performance is established ignoring the original negative residual stress; considering that it will be relaxed soon when the joint is under tension-tension cyclic loading. The fatigue parameters of joint model is based on the static mechanical properties of the joint that obtained from the micro-tensile tests and four-point correlation method. The predicted results for the fatigue weak locations and fatigue lives based on the continuous performance joint model are closer to the fatigue experimental results by comparison with the simulation results of the partitioned performance joint model.

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Characterization of mechanical properties, fatigue-crack propagation, and residual stresses in a microalloyed pipeline-steel friction-stir weld

Cited by 38 publications

References 36 publications

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

Behaviors of Embrittlement and Softening in Heat Affected Zone of High Strength X90 Pipeline Steels

Influence of Residual Stress on Fatigue Weak Areas and Simulation Analysis on Fatigue Properties Based on Continuous Performance of FSW Joints

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