Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Mo, Wenlin; Hu, Xiaobing; Lu, Shanping; Li, Dianzhong; Li, Yiyi

doi:10.1016/j.jmst.2015.08.001

Cited by 24 publications

(5 citation statements)

References 44 publications

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“…deteriorate the hot ductility of investigated alloys, which is similar to the effect of sulfur and phosphorus on hot ductility in the other alloys [17]. The segregation of boron atoms and precipitation of BN have a great effect on the hot ductility at 1,000°C.…”

Section: The Effect Of Element Segregation To Grain Boundaries On Hotsupporting

confidence: 71%

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Zheng

Wang

et al. 2018

High Temperature Materials and Processes

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This work conducted systematic studies on the effect of B on the hot ductility behavior of Fe-36Ni alloy over the temperature range of 900–1,200 °C by use of Gleeble-3500 thermal simulator, Thermo-Calc software, transmission electron microscopy and secondary ion mass spectroscopy. The influencing factors and mechanisms are also discussed in the present work. Results show that all the values of area reduction of the investigated alloy samples are below 60 % in the temperature range of 900–1,000 °C, indicating the poor hot ductility of the investigated alloys in this temperature range. When the grain boundary sliding occurs during the hot tensile processes, the fine secondary phase particles at grain boundaries prevent the occurrence of dynamic recrystallization and promote the nucleation and propagation of cracking simultaneously, resulting in the poor hot ductility of the investigated alloys in this temperature range. In the B bearing alloy, the segregation of B atoms around austenite grain boundaries promotes the solute dragging effects at grain boundaries and strongly inhibits the occurrence of dynamic recrystallization, which increases the brittle temperature to 1,000 °C. When the temperature exceeds 1,050 °C, the occurrence of dynamic recrystallization improves the hot ductility significantly. However, the coarsening of recrystallized grains and the formation of inter dendritic cracks decrease the hot ductility of the alloy gradually when the temperature increases from 1,100 °C to 1,200 °C.

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Section: The Effect Of Element Segregation To Grain Boundaries On Hotsupporting

confidence: 71%

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Zheng

Wang

et al. 2018

High Temperature Materials and Processes

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“…Figure 6 shows the surface morphology of the tensile fracture of the alloys at different annealing temperatures by SEM. The fracture appearances of the four types of samples are generally shown as dimples, indicating ductile fracture except for the sample with an annealing temperature of 923 K (Mo et al, 2015;Mo et al, 2013). The dimple size, distribution, and depth of each sample are different.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

Effect of Various Annealing Temperature on Microstructure and Properties of Metastable β-Type Ti-35Nb-2Ta-3Zr Alloy for Biomedical Applications

Zhang

Liu

et al. 2020

Front. Mater.

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Microstructure and properties of a metastable β-type Ti-35Nb-2Ta-3Zr alloy after cold rolling plus annealing at various temperatures were investigated systematically. The X-ray diffraction results show that the sample annealed at 923 K is mainly composed of the β phase (92.3%). However, the samples annealed at 723, 823, and 1023 K contain a large amount of α phase of 39.6, 36.5, and 39.4%, respectively. The elastic modulus of the sample annealed at 923 K is about 50.1 GPa. However, these of the samples annealed at 723, 823, and 1023 K are 73.7, 56.1, and 70.2 GPa. Furthermore, the sample annealed at 923 K presents the best elasticity and the highest recovery strain (∼66.87%). The corrosion rate of the sample annealed at 923 K (∼2.403 µm•a −1) is the lowest among all the samples, which may be attributed to its minimum content of α phase.

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“…Zheng et al [25,26] showed that the appropriate increase of carbon content is conducive to improving the mechanical properties of NiCrFe-7A additively manufactured metals. Mo et al [27][28][29] improved the overall mechanical properties of the weld metal by adjusting the content of Ti, Nb, and B elements in NiCrFe-7A welding material. Zhang et al [29] showed that the added Nb and Mo could be increased Inconel 690 weld metal mechanical properties and reduce the ductility-dip cracking tendency, where Mo mainly plays the solid solution strengthening.…”

Section: Introductionmentioning

confidence: 99%

“…Mo et al [27][28][29] improved the overall mechanical properties of the weld metal by adjusting the content of Ti, Nb, and B elements in NiCrFe-7A welding material. Zhang et al [29] showed that the added Nb and Mo could be increased Inconel 690 weld metal mechanical properties and reduce the ductility-dip cracking tendency, where Mo mainly plays the solid solution strengthening. Although the above work has investigated the effect of different elements on the properties of Inconel 690 metal, there is limited research on the effect of molybdenum (Mo) content on the properties of Inconel 690 alloys, primarily additive manufacturing metals.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Content on Microstructure and Mechanical Properties of Laser Melting Deposited Inconel 690 Alloy

et al. 2023

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Inconel 690 alloy is widely used in nuclear power, petrochemical, aerospace, and other fields due to its excellent high-temperature mechanical properties and corrosion resistance. The Inconel 690 alloy with different Mo content was fabricated by laser melting deposition (LMD). The effects of Mo content on the microstructure and mechanical properties were investigated. The microstructure of as-deposited Inconel 690 is composed of columnar dendrites grown epitaxially, and M23C6 carbides are precipitated in the grain boundaries. With the increase of Mo content, the amount of precipitated carbide increases gradually. At the same time, the grain boundary becomes convoluted. The tensile test at room temperature shows that the high Mo content in the as-deposited Inconel 690 increases the ultimate strength but decreases the ductility. Compared with low Mo content, the alloy with high Mo deposition has better mechanical properties. The present study provides a new method to achieve the preparation of Inconel 690 alloy with excellent integrated mechanical properties.

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Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Cited by 24 publications

References 44 publications

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Effect of Various Annealing Temperature on Microstructure and Properties of Metastable β-Type Ti-35Nb-2Ta-3Zr Alloy for Biomedical Applications

Effect of Mo Content on Microstructure and Mechanical Properties of Laser Melting Deposited Inconel 690 Alloy

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