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Influence of heat treatment on the mechanical and tribological properties of Incoloy 800H Superallo

Palanisamy A., Jeyaprakash N., Sivabharathi V., Sivasankaran S.

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 1

171--185

The selection and use of high strength alloys with high wear resistance (at room and high temperature) are mandatory in aerospace, nuclear, automotive, petroleum, space, furnace, and chemical industries in which Incoloy 800H superalloy is the right choice. However, this alloy is under the class of ‘difficult to cut material’ caused by their significant properties. In the present work, the heat treatment on Incoloy 800H superalloy was carried out at 1075 °C for 60 min and then the samples were cooled in the air (air cooling, AC) and furnace (furnace cooling, FC) to modify the microstructure. The mechanical and tribological behavior were examined on the heat-treated samples at room temperature to eliminate the effect of dynamic strain aging (DSA) which usually occurs at elevated temperatures in superalloys. Hardness measurement and compression tests were carried out to examine the variation of strength. Further, the dry sliding wear tests at room temperature were performed to analyze wear resistance of heat-treated specimens and compared with the as-received (AR) sample. Besides, the wear mechanism and surface roughness of worn-out specimens were analyzed. The result indicates that the air-cooled (AC) sample possessed high hardness, high compression strength, and more resistance to wear as compared to AR and FC samples. The identified wear mechanisms in AR and FC samples were abrasive, deep grooves, plastic deformation while the AC specimen exhibits mild grooves and lesser debris particles. Fractography analysis was also performed to find the nature or mode of fractures on the samples. ANOVA result indicates that the sample hardness after heat treatment has the most influencing parameter followed by the applied load on the wear rate and the coefficient of friction (CoF). The measured average roughness of the AC specimen has shown lesser value than the AR and FC specimens due to refined grain structure.

A study on the effect of different activating flux on A-TIG welding process of incoloy 800H

Sridhar S. P., Kumar S. A., Sathiya P.

Advances in Materials Science

2016

Vol. 16, nr 3(49)

26--37

This study investigates the effect of different activating flux such as V2O5, TiO2, MoO3, Cr2O3, and Al2O3 on A-TIG welding process of Incoloy 800H. The influence of the flux on the depth of penetration and on mechanical and metallurgical characteristics of the weld were studied and compared with autogeneous TIG welds which were welded with the same process parameters and conditions. The use of TiO2 flux gave full depth of penetration and the use of V2O5, Cr2O3 flux gave increased penetration as compared to autogeneous TIG welds while the use of Al2O3 and MoO3 led to the detoriation of the effect.