Abstract
. Fracture is the final stage of metal behavior under load, and the resistance that themetal gives to the development of this process, largely determines its structural strength. Inconel718 is gaining strength mainly due to the dispersion hardening in the allocation of secondaryphases. Purpose: to establish a set of mechanical properties and microstructure of heatstrengthened Inconel 718 and to investigate changes in the degree of deformation of the surfacemetal by the method of registration of macroloca l fields. Mechanical properties were determinedby standard methods on three samples. Registration of macrolocal displacement fields wasrecorded by DIC (digital image correlation) method simultaneously with stretching. The dataobtained from the DIC analy sis showed that at the time of rupture the local deformation of thesample increased to 36% sample 1, up to 50% sample 2, up to 25% sample 3. It is shown thatthe microstructure of the studied samples is homogeneous, the detected grain γ structure with theformation of duplicates, the density of the experimental samples was 98.3%.
Highlights
The process of fracture is the final stage of the behavior of the metal under load, and the resistance that the metal gives to the development of this process, largely determines its structural strength
The heat treatment mode of Inconel 718 alloy is usually chosen depending on the method of production and the properties that are required in the final product
From the tensile diagram (Fig. 2) it was found that the regions of elastic deformation are approximately the same for all samples and the yield strength is in the range 1311... 1321 MPa, the maximum point of ultimate strength of the samples - in the range 1503... 1532 MPa 202 seconds after the test
Summary
Adjamskiy Sergey Technical Director LLC «Additive Laser Technology of Ukraine», UKRAINE. Technical science, scientific secretary Institute of Iron and Steel of Z.I. Nekrasov NAS of Ukraine, UKRAINE materials engineer LLC «Additive Laser Technology of Ukraine», UKRAINE. Podolskyi Rostislav engineer of the first category department of problems of deformation and heat treatment of structural steels Institute of Iron and Steel of Z.I. Nekrasov NAS of Ukraine, UKRAINE. Purpose: to establish a set of mechanical properties and microstructure of heatstrengthened Inconel 718 and to investigate changes in the degree of deformation of the surface metal by the method of registration of macrolocal fields. Mechanical properties were determined by standard methods on three samples. Registration of macrolocal displacement fields was recorded by DIC (digital image correlation) method simultaneously with stretching.
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