Effects of post-weld heat treatment on microstructure and mechanical properties of laser welds in GH3535 superalloy

Yu, Kun; Jiang, Zhenguo; Leng, Bin; Li, Chaowen; Chen, Shuangjian; Wang, Tao; Zhou, Xingtai; Li, Zhijun

doi:10.1016/j.optlastec.2016.01.029

Cited by 28 publications

(6 citation statements)

References 18 publications

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“…It seems that due to the high carbon content, the aggregation of the carbide phases of molybdenum, silicon and nickel occurs, which occurs more on the surface of the alloy than in the grains. The similar corrosion behavior of the Hastelloy-N alloy with accumulation of carbides on reaction surface was also found for a molten LiF-BeF 2 salt mixture exposed in graphite crucible [18][19][20][21][22][23][24][25].…”

Section: Selective Chromium Corrosionsupporting

confidence: 73%

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Surenkov

Ignatiev

Presnyakov

et al. 2020

EPJ Nuclear Sci. Technol.

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Effect of the [U(IV)/U(III)] ratio of fuel salt on selective chromium corrosion and tellurium intergranular cracking (IGC) of Hastelloy N alloy in the LiF-BeF2-UF4 salt mixture was investigated. The chromium corrosion of Hastelloy N alloy is caused by the oxidation of chromium on the alloy surface by reaction with UF4. The tellurium IGC of Hastelloy N alloy is caused by the diffusion of tellurium along the grain boundaries with the formation of unstable tellurides with based metals and alloying additives. Results indicate that the selective chromium corrosion and the tellurium IGC of the Hastelloy N alloy in fuel salt can be controlled by the [U(IV)]/[U(III)] ratio. The tellurium IGC of Hastelloy N alloy exposed in fuel LiF-BeF2-UF4 salt can be avoided. For temperatures up to 760 °C the selective chromium corrosion can be minimized to the acceptable level when the [U(IV)]/[U(III)] ratio of fuel salt is bellow 30–40.

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Section: Selective Chromium Corrosionsupporting

confidence: 73%

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Surenkov

Ignatiev

Presnyakov

et al. 2020

EPJ Nuclear Sci. Technol.

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“…The authors suggested that the post-weld aging heat treatment can significantly boost the tensile strengths, particularly if welded in the ST condition, when compared with the as-welded condition. Kun Yu et al [19] investigated the microstructure and mechanical properties of GH 3535 solid-solution-strengthened nickel-based superalloy using laser welding and also studied the effect of PWHT. The authors identified that there was an increment in both tensile strength and percentage elongation when PWHT was employed.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

et al. 2019

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This work examines the influence of post-weld heat treatment (PWHT) on the fusion zone microstructure, and mechanical properties of electron beam (EB)-welded alloy 686. Comparative studies have been made on weld microstructure and tensile properties of the weldments both in as-welded and post-welded heat-treated conditions. PWHT consists of direct aging (DA/480°C for 3 h) and solution treatment (ST, 980°C for 1 h) followed by ageing and finally, homogenizing treatment (HT, 1200°C for 1 h) followed by DA and ST. The secondary topologically closed packed (TCP) phases formation, their distribution and microsegregation characteristics are studied with the aid of scanning electron microscope (SEM) analysis. Energy-dispersive X-ray spectroscopy (EDS) is also performed to estimate the microsegregation of alloying elements in the dendritic core and interdendritic regions of the weldments. The result shows that there is no significant change in the microstructure of DA and solution-treated sample as compared to the as-welded sample. The microstructure of HT sample was entirely different from those of as-welded and other HT samples. The SEM/EDS analysis illustrates the presence of secondary TCP phases (r, P and l) in the as-weld, DA and ST condition, whereas HT weldments did not show the presence of TCP phases. Tensile test results show higher tensile strength in ST condition whereas homogenization samples show higher ductility compared with others.

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“…For welding of metals, as is well known, the tensile strength and elongation of as-welded joints are lower than those of the base metal. Fortunately, many researchers have found that the mechanical properties of welded joints can be improved by PWHT in some metals [ 9 , 10 ]. Wang et al (2017) [ 11 ] researched the effects of aging treatments on the mechanical properties of Al-Cu-Li alloy joints and found that the strength coefficient of the joints increased from 0.64 to 0.90 after post weld double aging treatment.…”

Section: Introductionmentioning

confidence: 99%

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

Chen

Han

et al. 2018

Materials

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In this study, 7075 aluminum alloy with a thickness of 10 mm was successfully welded with no obvious defects by pulsed variable polarity plasma arc (PVPPA) welding. The mechanical properties of PVPPA welded joints have been researched by post weld heat treatment (PWHT). The results indicate that the heat treatment strongly affects the mechanical properties of the welded joints. The tensile strength and the microhardness of the welded joints gradually improved with the increase of the solution temperature. With the increase of the solution time, the tensile strength, and microhardness first dramatically increased and then decreased slightly. The best tensile strength of 537.5 MPa and the microhardness of 143.7 HV were obtained after 490 °C × 80 min + 120 °C × 24 h, and the strength was nearly 91.2% of that of the parent metal, and increased about 35% compared with as-welded. The improvement of strength and microhardness was mainly due to the precipitation of η′ phase.

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Effects of post-weld heat treatment on microstructure and mechanical properties of laser welds in GH3535 superalloy

Cited by 28 publications

References 18 publications

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

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Effects of post-weld heat treatment on microstructure and mechanical properties of laser welds in GH3535 superalloy

Cited by 28 publications

References 18 publications

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF2-UF4 salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF2-UF4 salt

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

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Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt