Influence of multipass welding on the energy of grain boundaries in nickel alloys

Authors

DOI:

https://doi.org/10.15587/2312-8372.2015.51449

Keywords:

grain boundary, ductility-dip crack, segregation energy, cohesive energy, adsorption

Abstract

The problem of crack resistance in nickel-based alloys requires an individual approach in the study for each case. Especially difficult to describe the mechanism of crack formation is the presence of welding heat. Nickel-based alloy In52 during deposition multilayer fusing tend to form ductility dip cracks (DDC) in the heat-affected zone. Taking into account all the factors affecting the process of cracking was developed a method of numerical evaluation the strength of the grain boundaries.

It was calculated the cohesive energy of the multilayer fusing made by wire In 52, in the heat-affected zone, based the thermodynamics theory of grain boundaries. Scanning electron microscope, optical microinterferometer were used to evaluate the crystallographic orientation of grain boundaries and it profile after vacuum etching.

It was found that with increasing misorientation angle θ the cohesive energy is decreased. Less resistant to formation DDC are high-angle grain boundaries with range misorientation inside of 45-60º and average Ecoh 3,1 J/m2. The reasons of decrease the cohesive energy in alloys In52 during multipass fusion welding is adsorption of S and O from the grains body to grain boundary. Given similar energy absorption S and O on the GB, it can be assumed that GB concentration of oxygen is 4,5-5 times higher than the sulfur. The average concentration of O and S on the surface of DDC for high angle boundaries is inside of 2,3-4,5 and 0,5-1 at. %, respectively.

Determination of the cohesive energy as a criterion of the probability formation DDC, permit to evaluate crack resistance of fusing, as well as to develop technological recommendations for prevent the formation of defects in the brittleness temperature range.

Author Biographies

Григорий Борисович Беляев, Paton Electric Welding Institute of NAS of Ukraine, Bozhenko str, 11, Kyiv-150, 03680

Junior Researcher

Department of metallurgy and technology of welding high-alloy steels and alloys

Иван Ростиславович Волосатов, Paton Electric Welding Institute of NAS of Ukraine, Bozhenko str, 11, Kyiv-150, 03680

Junior Researcher

Department of metallurgy and technology of welding high-alloy steels and alloys

Николай Юрьевич Каховский, Paton Electric Welding Institute of NAS of Ukraine, Bozhenko str, 11, Kyiv-150, 03680

Researcher

Department of metallurgy and technology of welding high-alloy steels and alloys

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Published

2015-09-22

How to Cite

Беляев, Г. Б., Волосатов, И. Р., & Каховский, Н. Ю. (2015). Influence of multipass welding on the energy of grain boundaries in nickel alloys. Technology Audit and Production Reserves, 5(7(25), 27–30. https://doi.org/10.15587/2312-8372.2015.51449

Issue

Vol. 5 No. 7(25) (2015): Fundamental and applied researches: integration into the world scientometric databases

Section

Technology organic and inorganic substances

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Copyright (c) 2016 Григорий Борисович Беляев, Иван Ростиславович Волосатов, Николай Юрьевич Каховский

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