Mechanical, structural and acoustic properties of new heat-resistant alloys Inconel® Filler Metal 52 and Inconel® Filler Metal 52MSS in the temperature range of 77-1200K

DOI: 10.62564/M4-YS3281

Yuri Semerenko, Viktor Zoryansky

B.I. Verkin Institute for Low Temperature Physics and Engineering, N.A.S. of Ukraine


Inconel®FM52 [1] and it next generation FM52MSS [2] were developed as welding consumables for heat and radiation resistant alloy Inconel®690 [3]. Low levels of Al and Ti in FM52MSS provides “clean” weld deposits that tend to be free of inclusions. Improved wetting and clean welds make FM52MSS ideal for welding in radioactively “hot” repair situations. In this regard, it is appropriate to study the physical and mechanical characteristics of these alloys. The acoustic, mechanical and structural properties of the FM52 and FM52MSS were studied using methods of acoustic spectroscopy, active deformation and electron microscopy in a temperature 77–1200K. In FM52MSS chemical heterogeneity in Nb and Mo is observed (grain boundaries are enriched in Nb and Mo with the release of NbC). In FM52 there is increase in the dislocation density during the transition from the grain volume to the boundary, which leads to a sharp gradient of local internal stresses. The distribution of local internal stresses in FM52MSS is uniform, which can be explained by the redistribution of internal stresses along grain boundaries during the defects diffusion to the grain boundaries. The failure of plasticity is observed in FM52, where the value of the relative elongation has reduced values, with a maximum in the temperature 1000-1200K. This temperature range coincides with the temperature interval of the failure of plasticity during the formation of hot cracks. At the same time, this failure in ductility is not observed in the FM52MSS. The behavior of high temperature background of acoustic absorption in FM52 correlates with the temperature range of failure of the plasticity [4]. As established, the availability of effective pinning centers hindering the dislocation mobility creates the preconditions for a uniform distribution of dislocations that leads to the absence of gradients of local stresses that, in turn, provides a high heat resistance and hot cracking resistance of the FM52MSS.

Keywords
Inconel 52 and Inconel 52MSS alloys, strength, ductility, acoustic absorption, elasticity modulus, heat resistance, crack resistance, failure of the plasticity, hot cracks

Acknowledgments
Not provided

References
[1] www.specialmetals.com/divisions/welding-products/tradenames/inconel/fm52.pdf [2] www.specialmetals.com/divisions/welding-products/tradenames/inconel/fm52mss.pdf [3] www.specialmetals.com/documents/Inconel alloy 690.pdf [4] Yu.A. Semerenko, O.V. Mozgovyj, L.V. Skibina, K.A. Yushchenko, G.V. Zviagintseva, Acoustic Properties of New Alloys Inconel 52 and Inconel 52MSS in the Temperature Range of 77—1200 K, Metallofiz. Noveishie Tekhnol., 2015, V.37, No.12, P.1643-1652