Yield Strength Evaluation of Dissimilar Components of Layered Steel/Steel Composite by Kinetic Indentation
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JMEPEG https://doi.org/10.1007/s11665-020-05083-3
Yield Strength Evaluation of Dissimilar Components of Layered Steel/Steel Composite by Kinetic Indentation S.V. Gladkovsky
, D.A. Konovalov
, and S.V. Kuteneva
(Submitted May 20, 2020; in revised form July 14, 2020) In the present study, values of yield strength of individual layers of layered composites based on different strength mild steels obtained by explosion welding followed by cold rolling and heat treatment were determined. The effect of cold rolling with a total reduction of 50% and heat treatment at a temperature of 500 °C on the change of the deformational resistance of Fe-2Mn-Si and Fe-11Cr-9Ni-2Mo-1Ti steelsÕ layers in the composite was established. It was shown that additional cold deformation of the layered composite leads to an increase in yield strength of Fe-2Mn-Si and Fe-11Cr-9Ni-2Mo-1Ti steelsÕ layers by 20% and 24%, respectively, and additional heat treatment of the cold-deformed composite contributes to strengthening of the Fe-11Cr-9Ni-2Mo-1Ti steel layers by 17% and softening of the Fe-2Mn-Si steel layers by 6%. It was shown that the level of strengthening of the Fe-11Cr-9Ni-2Mo-1Ti steel layers after cold rolling corresponds to the level of strengthening of this steel after heat treatment. It was determined that the maraging steel layers with initial ultrafine-grained microstructure are intensely strengthened (35%) by conducting combined heat-deformational processing of a layered composite, including cold rolling with a total reduction of 50% and subsequent heat treatment at a temperature of 500 °C. Keywords
cold rolling, heat treatment, laminated composite, mechanical properties, microstructure
1. Introduction Matrix, fiber and laminated composites as well as hybrid composites based on dissimilar steels and alloys are attractive materials for automobile, marine and aerospace application (Ref 1, 2). The main task of introducing new composites for fabrication of industrial products and structural elements is to study their mechanical characteristics during operation. This problem is usually solved by destructible experimental tests of composites. In order to predict and regulate mechanical properties of composite based on dissimilar materials, it is important to take into account local mechanical properties of the composite components and their tendency to change under the influence of deformation and high temperature. It is due to the fact that composite components can manifest their properties in various ways under the condition of intensive loading and extreme temperatures. At the same time, it is rather difficult to study the deformational behavior and the level of mechanical properties of individual composite components. The mixture rule (additivity rule) is used for calculating of the ultimate tensile strength of composites based on dissimilar metals and alloys. However, this rule is not extended to yield strength. On the other hand, the mechanical properties of the steel layers of the composites obtained by deformational and high-ener
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